{"id":752,"date":"2026-06-03T01:59:14","date_gmt":"2026-06-03T01:59:14","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?p=752"},"modified":"2026-06-03T01:59:14","modified_gmt":"2026-06-03T01:59:14","slug":"lifetime-lubrication-precision-planetary-gearbox-maintenance-guide","status":"publish","type":"post","link":"https:\/\/planetary-gearboxes.com\/hi\/lifetime-lubrication-precision-planetary-gearbox-maintenance-guide\/","title":{"rendered":"\u092a\u094d\u0930\u0947\u0938\u093f\u091c\u0928 \u092a\u094d\u0932\u0947\u0928\u0947\u091f\u0930\u0940 \u0917\u093f\u092f\u0930\u092c\u0949\u0915\u094d\u0938 \u092e\u0947\u0902 \u0906\u091c\u0940\u0935\u0928 \u0938\u094d\u0928\u0947\u0939\u0928"},"content":{"rendered":"<div style=\"max-width: 1160px; margin: 0 auto; padding: 2.5rem 3%; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif; color: #1a1a1a; line-height: 1.8;\">\n<p><!-- \u2500\u2500 HERO \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<div style=\"background: linear-gradient(158deg,#1c1400 0%,#3d2b00 50%,#78540a 100%); border-radius: 12px; padding: clamp(2rem,5vw,3.5rem) clamp(1.5rem,4vw,3rem); position: relative; overflow: hidden;\">\n<div style=\"position: absolute; inset: 0; background: repeating-linear-gradient(60deg,rgba(255,200,0,.03) 0,rgba(255,200,0,.03) 1px,transparent 1px,transparent 32px); pointer-events: none;\"><\/div>\n<div style=\"position: absolute; bottom: -60px; right: -60px; width: 260px; height: 260px; border: 1.5px solid rgba(255,200,0,.08); border-radius: 50%; pointer-events: none;\"><\/div>\n<div style=\"position: absolute; bottom: -20px; right: -20px; width: 140px; height: 140px; border: 1.5px solid rgba(255,200,0,.05); border-radius: 50%; pointer-events: none;\"><\/div>\n<div style=\"position: relative;\">\n<div style=\"display: flex; flex-wrap: wrap; gap: .55rem; margin-bottom: 1.1rem;\"><span style=\"font-family: 'Courier New',monospace; font-size: 11px; letter-spacing: 2px; color: #fcd34d; text-transform: uppercase; background: rgba(252,211,77,.1); border: 1px solid rgba(252,211,77,.25); padding: .25rem .7rem; border-radius: 3px;\">\u0915\u094b\u0930\u093f\u092f\u093e \u090f\u0935\u0930-\u092a\u093e\u0935\u0930<\/span><br \/>\n<span style=\"font-family: 'Courier New',monospace; font-size: 11px; letter-spacing: 2px; color: #fbbf24; text-transform: uppercase; background: rgba(251,191,36,.07); border: 1px solid rgba(251,191,36,.18); padding: .25rem .7rem; border-radius: 3px;\">Maintenance Engineering Guide<\/span><\/div>\n<h1 style=\"font-size: clamp(21px,3.6vw,34px); font-weight: 800; color: #ffffff; line-height: 1.22; margin: 0 0 1.2rem; max-width: 780px; letter-spacing: -.4px;\">Lifetime Lubrication in Precision Planetary Gearboxes \u2014 Engineering Behind Sealed-for-Life and What Maintenance Is Still Required<\/h1>\n<p style=\"font-size: clamp(13px,1.8vw,15px); color: rgba(255,255,255,.75); max-width: 680px; margin: 0 0 1.8rem; line-height: 1.8;\">&#8220;Lifetime lubrication&#8221; is one of the most misunderstood claims in precision drive engineering. It does not mean the gearbox needs no attention for its service life. It means no oil changes, no grease replenishment, and no lubricant-related scheduled downtime \u2014 if operating conditions stay within specification. This guide explains exactly what that specification means, what the grease chemistry does, and what inspections your EP series unit actually requires.<\/p>\n<p><a style=\"display: inline-block; background: #fcd34d; color: #1c1400; font-family: -apple-system,BlinkMacSystemFont,sans-serif; font-weight: 800; font-size: 14px; padding: .85rem 2rem; border-radius: 6px; text-decoration: none; letter-spacing: .3px;\" href=\"#contact\">Download Maintenance Checklist \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 MODULE 1: WHAT LIFETIME LUBRICATION MEANS \u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">What &#8220;Lifetime Lubrication&#8221; Actually Means \u2014 and What It Does Not<\/h2>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.2rem; max-width: 820px;\">The term &#8220;lifetime lubrication&#8221; (also marketed as &#8220;sealed for life,&#8221; &#8220;lubricated for life,&#8221; or &#8220;maintenance-free lubrication&#8221;) appears in the datasheets of every EP series precision <a style=\"color: #d97706; font-weight: 600;\" href=\"https:\/\/planetary-gearboxes.com\/hi\/product-category\/planetary-gearbox\/\">\u0917\u094d\u0930\u0939\u0940\u092f \u0917\u093f\u092f\u0930\u092c\u0949\u0915\u094d\u0938<\/a> from Korea Ever-Power. It carries a specific and bounded engineering meaning:<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: 1rem; margin-bottom: 1.8rem;\">\n<div style=\"background: #fffbeb; border: 1.5px solid #fde68a; border-top: 3px solid #d97706; border-radius: 0 0 8px 8px; padding: 1.1rem 1.2rem;\">\n<div style=\"font-size: 13px; font-weight: 800; color: #92400e; margin-bottom: .5rem;\">\u2705 What it DOES mean<\/div>\n<ul style=\"font-size: 12.5px; color: #444; margin: 0; padding-left: 1.1rem; line-height: 1.85;\">\n<li>No scheduled oil drain or grease replenishment for the rated 20,000-hour L10 life<\/li>\n<li>No re-greasing ports or drain plugs in the housing design<\/li>\n<li>Factory-certified lubricant quantity and type, pre-charged before shipment<\/li>\n<li>Orientation-independent operation \u2014 no oil level to monitor<\/li>\n<li>Zero lubricant-change-related downtime throughout rated service life<\/li>\n<\/ul>\n<\/div>\n<div style=\"background: #fef2f2; border: 1.5px solid #fecaca; border-top: 3px solid #dc2626; border-radius: 0 0 8px 8px; padding: 1.1rem 1.2rem;\">\n<div style=\"font-size: 13px; font-weight: 800; color: #991b1b; margin-bottom: .5rem;\">\u274c What it does NOT mean<\/div>\n<ul style=\"font-size: 12.5px; color: #444; margin: 0; padding-left: 1.1rem; line-height: 1.85;\">\n<li>Zero inspection requirement \u2014 temperature, noise, and seal integrity still need periodic checks<\/li>\n<li>Immunity to contamination \u2014 a damaged seal allows water or particles to degrade the sealed grease<\/li>\n<li>Indefinite service life \u2014 at 20,000h (L10), replacement is recommended regardless of apparent condition<\/li>\n<li>Permission to exceed rated operating temperature \u2014 grease life halves with every 10\u00b0C over baseline<\/li>\n<li>A substitute for correct initial specification \u2014 overloading destroys grease film regardless of seal integrity<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div style=\"background: #fffbeb; border-left: 4px solid #d97706; border-radius: 0 8px 8px 0; padding: 1rem 1.3rem;\">\n<p style=\"font-size: 13px; color: #555; margin: 0; line-height: 1.7;\"><strong style=\"color: #92400e;\">The critical distinction from traditional oil-bath gearboxes:<\/strong> A conventional oil-bath servo gear reducer requires oil changes every 2,000\u20135,000 hours because the oil degrades through oxidation, contamination, and thermal cycling. Each oil change involves draining, cleaning, refilling, and a mandatory production stop. Over 20,000 hours, this means 4\u201310 planned downtime events for lubrication alone. The EP series sealed grease eliminates all of these \u2014 but it does so by enclosing a finite amount of high-performance grease in a sealed cavity, which means the grease condition cannot be inspected directly and the sealed housing integrity becomes the single critical variable.<\/p>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 IMAGE 1 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<div style=\"margin-bottom: 3.5rem; border-radius: 10px; overflow: hidden; box-shadow: 0 3px 16px rgba(0,0,0,.1);\"><img decoding=\"async\" style=\"width: 100%; height: auto; display: block;\" title=\"Planetary Gearbox Assembly \u2014 Factory Grease Charging for Lifetime Lubrication\" src=\"https:\/\/planetary-gearboxes.com\/wp-content\/uploads\/2026\/06\/Planerary-Gearbox-Assembly-Procedure.webp\" alt=\"Precision planetary gearbox assembly procedure showing factory grease charging process \u2014 sealed lifetime lubrication design eliminates all oil changes over 20000 service hours\" \/><\/p>\n<div style=\"background: #fffbeb; padding: .65rem 1.1rem; font-family: -apple-system,sans-serif; font-size: 12px; color: #666;\">Factory assembly of EP series planetary gearboxes includes precision grease charging \u2014 exact quantity and distribution are verified before sealing. Over- or under-filling the grease cavity are equally damaging: excess grease generates churning heat; insufficient grease creates boundary lubrication conditions. <a style=\"color: #d97706; font-weight: 600;\" href=\"https:\/\/planetary-gearboxes.com\/hi\/product-category\/planetary-gearbox\/\">\u0908\u092a\u0940 \u0938\u0940\u0930\u0940\u091c \u0915\u0940 \u0935\u093f\u0936\u093f\u0937\u094d\u091f\u0924\u093e\u090f\u0901 \u0926\u0947\u0916\u0947\u0902 \u2192<\/a><\/div>\n<\/div>\n<p><!-- \u2500\u2500 MODULE 2: GREASE CHEMISTRY \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">The Grease Chemistry \u2014 Why PAO and Polyurea Outlast Mineral Oil in Sealed Gearboxes<\/h2>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.2rem; max-width: 820px;\">Not all grease is the same, and the choice of base oil and thickener is what separates a genuine lifetime-lubricated design from a sealed gearbox that will degrade in 3,000 hours. EP series planetary gear reducers use synthetic grease based on either polyalphaolefin (PAO) base oil or a PAO-ester blend, thickened with lithium complex or polyurea compound. This combination is chosen for three properties that mineral oil greases cannot match over a 20,000-hour service life.<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.8rem;\">\n<div style=\"display: flex; gap: 1rem; align-items: flex-start; flex-wrap: wrap; background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1.1rem 1.3rem;\">\n<div style=\"flex-shrink: 0; min-width: 80px; text-align: center; background: #d97706; color: #fff; border-radius: 6px; padding: .5rem .4rem;\">\n<div style=\"font-family: 'Courier New',monospace; font-size: 18px; font-weight: 800; line-height: 1;\">1<\/div>\n<div style=\"font-size: 10px; margin-top: 2px; opacity: .9;\">Oxidation<\/div>\n<\/div>\n<div style=\"flex: 1 1 260px;\">\n<div style=\"font-size: 13.5px; font-weight: bold; color: #92400e; margin-bottom: .4rem;\">Oxidation Resistance \u2014 The Lifespan Multiplier<\/div>\n<p style=\"font-size: 13px; color: #444; margin: 0; line-height: 1.7;\">PAO base oil has a viscosity index (VI) of 130\u2013160 and an oxidation onset temperature approximately 30\u201340\u00b0C higher than Group I mineral oil. In a sealed gearbox operating at 70\u201380\u00b0C continuously, mineral-based grease begins oxidising (thickening and forming acidic breakdown products) within 3,000\u20135,000 hours. PAO-based grease at the same temperature maintains adequate viscosity and EP additive activity for 15,000\u201320,000 hours. The result is that the 20,000-hour life claim is chemically achievable with PAO but not with mineral grease \u2014 which is why any sealed gearbox using mineral grease has a marketing problem if it claims &#8220;lifetime lubrication.&#8221;<\/p>\n<\/div>\n<\/div>\n<div style=\"display: flex; gap: 1rem; align-items: flex-start; flex-wrap: wrap; background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1.1rem 1.3rem;\">\n<div style=\"flex-shrink: 0; min-width: 80px; text-align: center; background: #d97706; color: #fff; border-radius: 6px; padding: .5rem .4rem;\">\n<div style=\"font-family: 'Courier New',monospace; font-size: 18px; font-weight: 800; line-height: 1;\">2<\/div>\n<div style=\"font-size: 10px; margin-top: 2px; opacity: .9;\">Extreme<br \/>\nPressure<\/div>\n<\/div>\n<div style=\"flex: 1 1 260px;\">\n<div style=\"font-size: 13.5px; font-weight: bold; color: #92400e; margin-bottom: .4rem;\">EP Additive Durability \u2014 Protecting Gear Tooth Flanks at Peak Contact Stress<\/div>\n<p style=\"font-size: 13px; color: #444; margin: 0; line-height: 1.7;\">The Hertzian contact stress at the tip of a planet gear tooth flank under rated torque can reach 1,000\u20131,500 MPa \u2014 well above the regime where hydrodynamic lubrication film is sufficient. Extreme pressure (EP) additives in the grease form a chemical reaction layer (typically zinc dithiophosphate or sulphur-phosphorus compounds) that prevents metal-to-metal welding at these stress levels. Unlike base oil, EP additives are consumed through use. In sealed gearboxes, the additive package is designed to last the rated service life at the rated load \u2014 but overloading (torques above rated \u00d7 SF) accelerates additive depletion and can exhaust the EP package in 20\u201330% of the rated hours, effectively reducing the remaining service life to bare-oil conditions.<\/p>\n<\/div>\n<\/div>\n<div style=\"display: flex; gap: 1rem; align-items: flex-start; flex-wrap: wrap; background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1.1rem 1.3rem;\">\n<div style=\"flex-shrink: 0; min-width: 80px; text-align: center; background: #d97706; color: #fff; border-radius: 6px; padding: .5rem .4rem;\">\n<div style=\"font-family: 'Courier New',monospace; font-size: 18px; font-weight: 800; line-height: 1;\">3<\/div>\n<div style=\"font-size: 10px; margin-top: 2px; opacity: .9;\">\u0915\u092e<br \/>\n\u0905\u0938\u094d\u0925\u093e\u092f\u0940<\/div>\n<\/div>\n<div style=\"flex: 1 1 260px;\">\n<div style=\"font-size: 13.5px; font-weight: bold; color: #92400e; margin-bottom: .4rem;\">Cold-Start Viscosity \u2014 Why EP Series Works at \u221225\u00b0C Without Modification<\/div>\n<p style=\"font-size: 13px; color: #444; margin: 0; line-height: 1.7;\">PAO base oil retains pumpability and lubricating film at temperatures as low as \u221240\u00b0C, compared to approximately \u221215\u00b0C for typical mineral-based greases. This is why the EP series operating temperature range is stated as \u221225\u00b0C to +90\u00b0C without caveat or modification. At cold-chain facility temperatures of \u221220\u00b0C, a mineral-based sealed gearbox would experience oil starvation at start-up \u2014 the grease is too viscous to distribute to bearing races and gear meshes during the first minutes of operation. PAO grease at \u221220\u00b0C remains fluid enough to form an adequate film immediately on start-up. The one recommended precaution for EP series units in sub-zero environments is a soft-start (reduced ramp rate for the first 2\u20133 minutes) to allow gradual thermal equalisation before demanding peak torque.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 MODULE 3: TEMPERATURE vs GREASE LIFE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">Temperature Is the Single Biggest Variable in Sealed Grease Life<\/h2>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.2rem; max-width: 820px;\">The 20,000-hour lifetime lubrication claim is not a fixed absolute \u2014 it is a function of housing temperature. The relationship follows the Arrhenius model, which for lubricating greases approximates to a halving of service life for every 10\u00b0C rise above the baseline operating temperature. The EP series baseline is 70\u00b0C housing temperature at rated load and rated input speed. The rated maximum housing temperature is 90\u00b0C (ambient + 90\u00b0C is specified; for a 30\u00b0C Korean factory environment, this means housing temperature \u2264 120\u00b0C, but the grease life at 120\u00b0C is only 625 hours).<\/p>\n<div style=\"overflow-x: auto; margin-bottom: 1.5rem;\">\n<table style=\"width: 100%; border-collapse: collapse; font-family: -apple-system,sans-serif; font-size: clamp(11px,1.5vw,13px); min-width: 500px;\">\n<thead>\n<tr style=\"background: #1c1400; color: #fff;\">\n<th style=\"padding: .8rem 1rem; text-align: left; border: 1px solid #3d2b00; font-weight: bold;\">Housing Temperature<\/th>\n<th style=\"padding: .8rem .8rem; text-align: center; border: 1px solid #3d2b00;\">Grease Service Life<\/th>\n<th style=\"padding: .8rem .8rem; text-align: center; border: 1px solid #3d2b00;\">% of Rated Life<\/th>\n<th style=\"padding: .8rem .8rem; text-align: center; border: 1px solid #3d2b00;\">\u0938\u094d\u0925\u093f\u0924\u093f<\/th>\n<th style=\"padding: .8rem 1rem; text-align: left; border: 1px solid #3d2b00;\">Implication<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background: #f0fdf4;\">\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">60\u00b0C<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; font-weight: bold; color: #15803d;\">40,000 h<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #15803d;\">200%<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #15803d;\">\u2705 Extended life<\/td>\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-size: 12px;\">Light-duty or low-ambient environments \u2014 replace at L10 bearing limit regardless<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">70\u00b0C<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; font-weight: bold; color: #15803d;\">20,000 \u0918\u0902\u091f\u0947<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #15803d;\">100%<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #15803d;\">\u2705 Design baseline<\/td>\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-size: 12px;\">Rated condition; grease life equals bearing L10 life exactly as designed<\/td>\n<\/tr>\n<tr style=\"background: #fefce8;\">\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">80\u00b0C<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; font-weight: bold; color: #b45309;\">10,000 h<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">50%<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">\u26a0 Monitor closely<\/td>\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-size: 12px;\">Grease life now shorter than bearing L10; bearing may outlast lubricant<\/td>\n<\/tr>\n<tr style=\"background: #fef9c3;\">\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">90\u00b0C (max rating)<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; font-weight: bold; color: #b45309;\">5,000 h<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">25%<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">\u26a0 At rated limit<\/td>\n<td style=\"padding: .65rem 1rem; border: 1px solid #e5e7eb; font-size: 12px;\">Schedule replacement at 5,000h; reduce load or add cooling if sustained<\/td>\n<\/tr>\n<tr style=\"background: #fff5f5;\">\n<td style=\"padding: .65rem 1rem; border: 1px solid #fecaca; font-weight: bold; color: #dc2626;\">100\u00b0C<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; font-weight: bold; color: #dc2626;\">2,500 \u0918\u0902\u091f\u0947<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; color: #dc2626;\">12.5%<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; color: #dc2626;\">\u274c Over limit<\/td>\n<td style=\"padding: .65rem 1rem; border: 1px solid #fecaca; font-size: 12px; color: #991b1b;\">Investigate overload or cooling failure immediately; plan unit replacement<\/td>\n<\/tr>\n<tr style=\"background: #fef2f2;\">\n<td style=\"padding: .65rem 1rem; border: 1px solid #fecaca; font-weight: bold; color: #dc2626;\">110\u00b0C<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; font-weight: bold; color: #dc2626;\">1,250 h<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; color: #dc2626;\">6.3%<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; color: #dc2626;\">\u274c Critical<\/td>\n<td style=\"padding: .65rem 1rem; border: 1px solid #fecaca; font-size: 12px; color: #991b1b;\">Grease failure is imminent; stop machine and investigate cause<\/td>\n<\/tr>\n<tr style=\"background: #fff0f0;\">\n<td style=\"padding: .65rem 1rem; border: 1px solid #fecaca; font-weight: bold; color: #7f1d1d;\">120\u00b0C<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; font-weight: bold; color: #7f1d1d;\">625 h<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; color: #7f1d1d;\">3.1%<\/td>\n<td style=\"padding: .65rem .8rem; border: 1px solid #fecaca; text-align: center; color: #7f1d1d;\">\u274c Failure zone<\/td>\n<td style=\"padding: .65rem 1rem; border: 1px solid #fecaca; font-size: 12px; color: #7f1d1d;\">Grease failure within weeks; shutdown required<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"font-size: 11.5px; color: #888; font-family: -apple-system,sans-serif; margin: -.5rem 0 1.4rem;\">Grease service life follows the Arrhenius model: halving per 10\u00b0C above 70\u00b0C baseline. Values are for PAO\/polyurea-type grease used in EP series. Actual housing temperature = ambient + heat generated by gearbox losses (P_heat = P_input \u00d7 (1\u2212\u03b7)).<\/p>\n<div style=\"background: #fffbeb; border-left: 4px solid #d97706; border-radius: 0 8px 8px 0; padding: 1rem 1.3rem; margin-bottom: 1rem;\">\n<div style=\"font-size: 13.5px; font-weight: bold; color: #92400e; margin-bottom: .4rem;\">How to calculate your actual housing temperature<\/div>\n<p style=\"font-size: 13px; color: #555; margin: 0 0 .6rem; line-height: 1.7;\">Housing temperature = ambient temperature + temperature rise from internal losses. For an EP-ZDE-80 at 2-stage efficiency 94%, with 750W input: P_heat = 750 \u00d7 (1 \u2212 0.94) = 45W. With a housing surface area of approximately 0.06 m\u00b2 and natural convection coefficient h \u2248 15 W\/(m\u00b2\u00b7K): \u0394T = 45 \/ (15 \u00d7 0.06) = 50\u00b0C. At 25\u00b0C ambient, housing temperature \u2248 75\u00b0C \u2014 within the 10,000h grease life band. Add forced air cooling to reduce \u0394T; reduce input speed (lower rpm \u2192 lower friction power) if the housing runs hot.<\/p>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 MODULE 4: CONTAMINATION EFFECT \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">Grease Contamination \u2014 How Water and Particles Shorten Life Exponentially<\/h2>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.2rem; max-width: 820px;\">The sealed housing of an EP series lifetime-lubricated planetary gear reducer is its primary defence against the two contamination types that destroy grease function: water and solid particles. Both enter through the same path \u2014 a compromised lip seal on the output shaft or input interface \u2014 and both accelerate gear tooth surface fatigue through a mechanism that is exponential rather than linear.<\/p>\n<div style=\"overflow-x: auto; margin-bottom: 1.5rem;\">\n<table style=\"width: 100%; border-collapse: collapse; font-family: -apple-system,sans-serif; font-size: clamp(11px,1.5vw,13px); min-width: 500px;\">\n<thead>\n<tr style=\"background: #1c1400; color: #fff;\">\n<th style=\"padding: .75rem 1rem; text-align: left; border: 1px solid #3d2b00;\">Grease Condition<\/th>\n<th style=\"padding: .75rem .8rem; text-align: center; border: 1px solid #3d2b00;\">Film Strength<\/th>\n<th style=\"padding: .75rem .8rem; text-align: center; border: 1px solid #3d2b00;\">Equivalent Load Multiplier<\/th>\n<th style=\"padding: .75rem .8rem; text-align: center; border: 1px solid #3d2b00;\">Gear Surface Life<\/th>\n<th style=\"padding: .75rem .8rem; text-align: center; border: 1px solid #3d2b00;\">Change vs Clean<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background: #f0fdf4;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">Clean, new (0% contamination)<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #15803d; font-weight: bold;\">100%<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center;\">\u00d71.00<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; font-weight: bold; color: #15803d;\">20,000 \u0918\u0902\u091f\u0947<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center;\">\u0906\u0927\u093e\u0930\u092d\u0942\u0924<\/td>\n<\/tr>\n<tr style=\"background: #fefce8;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">Light contamination (20%)<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">80%<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center;\">\u00d71.08<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; font-weight: bold; color: #b45309;\">10,240 h<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">\u2212491\u091f\u0940\u092a\u09403\u091f\u0940<\/td>\n<\/tr>\n<tr style=\"background: #fef9c3;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">Moderate contamination (40%)<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">60%<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center;\">\u00d71.19<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; font-weight: bold; color: #b45309;\">4,320 h<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309;\">\u221278%<\/td>\n<\/tr>\n<tr style=\"background: #fff5f5;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #fecaca; font-weight: bold; color: #dc2626;\">Water emulsification (60%)<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; color: #dc2626;\">40%<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center;\">\u00d71.36<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; font-weight: bold; color: #dc2626;\">1,280 h<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; color: #dc2626;\">\u221294%<\/td>\n<\/tr>\n<tr style=\"background: #fef2f2;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #fecaca; font-weight: bold; color: #7f1d1d;\">Severe contamination (80%)<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; color: #7f1d1d;\">20%<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center;\">\u00d71.71<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; font-weight: bold; color: #7f1d1d;\">160 h<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; color: #7f1d1d;\">\u221299.2%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"font-size: 11.5px; color: #888; font-family: -apple-system,sans-serif; margin: -.3rem 0 1.3rem;\">Gear surface fatigue life exponent b \u2248 9 (ISO 6336 surface durability for case-hardened steel). Film strength reduction modelled as proportional load increase. At 60% water contamination, grease is visually emulsified (white\/grey) \u2014 a reliable field detection indicator.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 1rem;\">\n<div style=\"flex: 1 1 260px; background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1.1rem 1.2rem;\">\n<div style=\"font-size: 13px; font-weight: bold; color: #92400e; margin-bottom: .4rem;\">How to detect precision planetary gearbox contamination without disassembly<\/div>\n<ul style=\"font-size: 12.5px; color: #555; margin: 0; padding-left: 1.2rem; line-height: 1.85;\">\n<li><strong>Visual:<\/strong> White or grey grease at output shaft seal = water emulsification confirmed<\/li>\n<li><strong>Thermal:<\/strong> Housing temperature rising without load change = film breakdown increasing friction<\/li>\n<li><strong>Acoustic:<\/strong> Grinding or crackling at low speed = metallic particle contamination in gear mesh<\/li>\n<li><strong>Backlash trend:<\/strong> Rapid increase (&gt;20% per 2,000h) = abrasive wear indicating particle contamination<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 260px; background: #f0fdf4; border: 1.5px solid #bbf7d0; border-radius: 8px; padding: 1.1rem 1.2rem;\">\n<div style=\"font-size: 13px; font-weight: bold; color: #15803d; margin-bottom: .4rem;\">Prevention: IP rating for your precision planetary gearbox installation<\/div>\n<p style=\"font-size: 12.5px; color: #555; margin: 0; line-height: 1.7;\">IP54 (EP-ZDE\/ZDF\/ZDWE\/ZDWF): resists water splashing from any direction. Cannot withstand direct sustained hose washing. IP65 (<a style=\"color: #15803d; font-weight: 600;\" href=\"https:\/\/planetary-gearboxes.com\/hi\/product\/ep-zds-series-high-stiffness-planetary-gearbox\/\">EP-ZDS<\/a>): withstands direct water jet (IPX5 test: 6.3mm nozzle, 12.5 L\/min, any direction). For any HACCP washdown, automotive body-shop, or outdoor installation: use EP-ZDS IP65 from the outset. Never attempt to supplement IP54 sealing with external wrapping \u2014 the sealed housing integrity cannot be meaningfully improved after assembly.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 IMAGE 2 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<div style=\"margin-bottom: 3.5rem; border-radius: 10px; overflow: hidden; box-shadow: 0 3px 16px rgba(0,0,0,.1);\"><img decoding=\"async\" style=\"width: 100%; height: auto; display: block;\" title=\"Planetary Gearbox Internal Structure \u2014 Sealed Lifetime Lubrication System\" src=\"https:\/\/planetary-gearboxes.com\/wp-content\/uploads\/2026\/05\/planetary-gearbox-structure-1.webp\" alt=\"Precision planetary gearbox internal structure showing gear mesh surfaces bearing positions and sealed grease distribution \u2014 lifetime lubrication system design for 20000 hour service\" \/><\/p>\n<div style=\"background: #fffbeb; padding: .65rem 1.1rem; font-family: -apple-system,sans-serif; font-size: 12px; color: #666;\">EP series internal structure: planet gear tooth flanks, sun gear mesh, and bearing races all depend on the sealed PAO\/polyurea grease for continuous film protection. The sealed housing (visible in cross-section) is the single critical barrier \u2014 its integrity determines whether the 20,000-hour grease life is achieved or not.<\/div>\n<\/div>\n<p><!-- \u2500\u2500 MODULE 5: MOUNTING ORIENTATION \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">Any Mounting Orientation \u2014 Why Sealed Grease Outperforms Oil-Bath in This Respect<\/h2>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.2rem; max-width: 820px;\">One of the practical engineering advantages of sealed grease over oil-bath lubrication that receives insufficient attention in published comparisons is mounting orientation. An oil-bath gearbox has a defined oil level \u2014 which means it has a defined &#8220;correct&#8221; orientation. Install it vertically shaft-up when the oil level is designed for horizontal operation, and the bearing at the top of the housing runs dry. Install it inverted, and the shaft seal \u2014 designed to contain oil, not to hold it against reverse head pressure \u2014 leaks.<\/p>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.5rem; max-width: 820px;\">EP series sealed grease gearboxes have no oil level to maintain. The grease is retained by the sealed housing regardless of orientation. Gravity influences grease distribution inside the housing but does not drain lubricant away from any critical surface, because grease \u2014 unlike oil \u2014 does not flow freely under gravity. The lip seals are designed to retain grease, not a fluid, which means their load in any orientation is the weight of the grease against the seal face rather than fluid head pressure.<\/p>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr)); gap: .9rem; margin-bottom: 1.2rem;\">\n<div style=\"background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1rem 1.1rem; text-align: center;\">\n<div style=\"font-size: 24px; margin-bottom: .4rem;\">\u2194<\/div>\n<div style=\"font-size: 13px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u0915\u094d\u0937\u0948\u0924\u093f\u091c<\/div>\n<div style=\"font-size: 12px; color: #555; line-height: 1.6;\">Gravity slightly pools grease downward. Churning during rotation redistributes to all surfaces. \u2705 Rated life fully achieved.<\/div>\n<\/div>\n<div style=\"background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1rem 1.1rem; text-align: center;\">\n<div style=\"font-size: 24px; margin-bottom: .4rem;\">\u2191<\/div>\n<div style=\"font-size: 13px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">Vertical Shaft-Up<\/div>\n<div style=\"font-size: 12px; color: #555; line-height: 1.6;\">Grease at input side tends downward toward output. Input lip seal retains grease. \u2705 Rated life achieved with no modification.<\/div>\n<\/div>\n<div style=\"background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1rem 1.1rem; text-align: center;\">\n<div style=\"font-size: 24px; margin-bottom: .4rem;\">\u2193<\/div>\n<div style=\"font-size: 13px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">Vertical Shaft-Down<\/div>\n<div style=\"font-size: 12px; color: #555; line-height: 1.6;\">Grease pools slightly at output seal. Labyrinth channel prevents excess pressure on seal. \u2705 Rated life achieved.<\/div>\n<\/div>\n<div style=\"background: #fffbeb; border: 1.5px solid #fde68a; border-radius: 8px; padding: 1rem 1.1rem; text-align: center;\">\n<div style=\"font-size: 24px; margin-bottom: .4rem;\">\u2197<\/div>\n<div style=\"font-size: 13px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">Any Angle<\/div>\n<div style=\"font-size: 12px; color: #555; line-height: 1.6;\">Robot joints, tilted conveyors, angled installation \u2014 all orientations supported. \u2705 No design modification required.<\/div>\n<\/div>\n<\/div>\n<div style=\"background: #fffbeb; border-left: 4px solid #d97706; border-radius: 0 8px 8px 0; padding: 1rem 1.3rem;\">\n<p style=\"font-size: 13px; color: #555; margin: 0; line-height: 1.7;\"><strong style=\"color: #92400e;\">One installation warning \u2014 never overfill:<\/strong> Because the sealed housing has no vent, any additional grease introduced into the cavity (for example through a modified housing or access port) has no escape path when the grease expands at operating temperature. The result is elevated internal pressure that forces grease past the lip seal, creating apparent &#8220;leakage&#8221; that is actually overfilling damage. EP series gearboxes have no fill port for this reason \u2014 the factory-sealed grease quantity is precisely calibrated. Do not attempt to add grease to an EP series unit in the field.<\/p>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 MODULE 6: LIFETIME vs OIL TCO \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">10-Year Total Cost of Ownership \u2014 Lifetime Lubrication vs Conventional Re-Greased Gearbox<\/h2>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.2rem; max-width: 820px;\">The purchase price comparison between an EP series sealed gearbox and a conventional oil-lubricated unit of similar torque class often shows the EP unit at a modest price premium. The full economic analysis consistently reverses this conclusion when operating costs are included. The following comparison uses conservative assumptions appropriate for a Korean servo automation production line operating two shifts per day.<\/p>\n<div style=\"background: #1c1400; border-radius: 10px; padding: 1.8rem 2rem; margin-bottom: 1.5rem;\">\n<div style=\"font-family: -apple-system,sans-serif; font-size: 12px; font-weight: bold; color: #fcd34d; letter-spacing: 1.5px; text-transform: uppercase; margin-bottom: 1.1rem;\">10-Year TCO Comparison \u2014 Two-Shift Korean Automation Line<\/div>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); gap: 1.2rem;\">\n<div style=\"background: rgba(255,255,255,.06); border-radius: 8px; padding: 1.2rem 1.3rem; border-top: 2px solid rgba(252,211,77,.4);\">\n<div style=\"font-family: -apple-system,sans-serif; font-size: 13px; font-weight: bold; color: #fcd34d; margin-bottom: .8rem;\">EP Series Lifetime-Lubricated<\/div>\n<div style=\"font-family: 'Courier New',monospace; font-size: 12.5px; color: rgba(255,255,255,.85); line-height: 2.1;\">\n<div>Oil changes: 0<\/div>\n<div>Downtime for lubrication: 0 h<\/div>\n<div>Lubricant cost: $0<\/div>\n<div>Labour cost: $0<\/div>\n<div style=\"border-top: 1px solid rgba(252,211,77,.3); padding-top: .4rem; margin-top: .4rem;\">Downtime cost (@ $500\/h): $0<\/div>\n<div style=\"color: #86efac; font-weight: bold; margin-top: .3rem;\">10-year maintenance cost: $0<\/div>\n<\/div>\n<\/div>\n<div style=\"background: rgba(255,255,255,.06); border-radius: 8px; padding: 1.2rem 1.3rem; border-top: 2px solid rgba(248,113,113,.4);\">\n<div style=\"font-family: -apple-system,sans-serif; font-size: 13px; font-weight: bold; color: #fca5a5; margin-bottom: .8rem;\">Conventional Oil-Lubricated Equivalent<\/div>\n<div style=\"font-family: 'Courier New',monospace; font-size: 12.5px; color: rgba(255,255,255,.85); line-height: 2.1;\">\n<div>Oil changes: every 2,000h \u2192 10 total<\/div>\n<div>Downtime per change: 0.5h \u00d7 10 = 5.0h<\/div>\n<div>Oil cost: $4.50 \u00d7 10 = $45<\/div>\n<div>Labour cost: $50 \u00d7 10 = $500<\/div>\n<div style=\"border-top: 1px solid rgba(248,113,113,.3); padding-top: .4rem; margin-top: .4rem;\">Downtime cost: 5.0h \u00d7 $500\/h = $2,500<\/div>\n<div style=\"color: #fca5a5; font-weight: bold; margin-top: .3rem;\">10-year maintenance cost: $3,045<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"margin-top: 1rem; background: rgba(252,211,77,.08); border-radius: 6px; padding: .9rem 1.1rem; font-family: -apple-system,sans-serif; font-size: 13px; color: #fcd34d; font-weight: bold;\">Maintenance saving per gearbox over 10 years: $3,045 \u2014 excluding any risk premium for contamination failures during oil change operations.<\/div>\n<div style=\"font-size: 11px; color: rgba(255,255,255,.4); margin-top: .6rem; font-family: -apple-system,sans-serif;\">Assumptions: 20,000h operation (2 shifts, 5 days\/week, 10 years). Downtime cost $500\/h (conservative Korean automotive plant estimate). Oil change interval 2,000h. Oil 0.3L \u00d7 $15\/L = $4.50. Labour $50\/change. Excludes contamination risk during oil change operations.<\/div>\n<\/div>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1rem; max-width: 820px;\">This calculation does not include the probability-weighted cost of contamination events during oil changes \u2014 each time a gearbox is opened for oil service, there is a risk of particulate contamination entering the housing. In practice, a fraction of conventional gearbox oil changes result in accelerated wear that manifests months later, making the true maintenance cost of conventional lubrication higher than the scheduled direct cost alone.<\/p>\n<\/section>\n<p><!-- \u2500\u2500 IMAGE 3 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<div style=\"margin-bottom: 3.5rem; border-radius: 10px; overflow: hidden; box-shadow: 0 3px 16px rgba(0,0,0,.1);\"><img decoding=\"async\" style=\"width: 100%; height: auto; display: block;\" title=\"EP Series Lifetime Lubrication in Industrial Applications \u2014 Korea Ever-Power\" src=\"https:\/\/planetary-gearboxes.com\/wp-content\/uploads\/2026\/05\/Planetary-Gearbox-Application-2.webp\" alt=\"Precision planetary gearbox in demanding industrial automation application \u2014 sealed lifetime-lubricated EP series maintains performance across harsh production environments without scheduled oil changes\" \/><\/p>\n<div style=\"background: #fffbeb; padding: .65rem 1.1rem; font-family: -apple-system,sans-serif; font-size: 12px; color: #666;\">EP series precision planetary gearboxes in production environments \u2014 sealed lifetime lubrication eliminates scheduled oil changes and contamination risk across all five series variants.<\/div>\n<\/div>\n<p><!-- \u2500\u2500 MODULE 7: MAINTENANCE SCHEDULE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 .5rem;\">The Complete EP Series Maintenance Schedule<\/h2>\n<p style=\"font-size: 13px; color: #666; font-family: -apple-system,sans-serif; margin: 0 0 1.4rem; font-style: italic;\">Printable reference \u2014 covers EP-ZDE, EP-ZDF, EP-ZDWE, EP-ZDWF, and EP-ZDS series<\/p>\n<div style=\"display: flex; flex-direction: column; gap: 1px; border: 1.5px solid #fde68a; border-radius: 10px; overflow: hidden;\">\n<div style=\"background: #d97706; padding: 1rem 1.4rem; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;\">\n<div style=\"font-family: 'Courier New',monospace; font-size: 16px; font-weight: 800; color: #fff; white-space: nowrap;\">Every 500 h \/ Monthly<\/div>\n<div style=\"font-size: 12px; color: rgba(255,255,255,.8); font-family: -apple-system,sans-serif;\">3 checks \u2014 visual and sensory, no tools required<\/div>\n<\/div>\n<div style=\"background: #fffbeb; padding: 1rem 1.4rem;\">\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: .8rem;\">\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2460 Seal visual inspection<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Inspect output shaft seal face and input flange seal. Any visible grease outside the housing = seal breach. White\/grey grease = water ingress. Either condition: schedule unit investigation within 48h.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2461 Auditory check at rated load<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Listen at rated speed and rated load for new high-pitch whining (input bearing), grinding at direction reversals (gear mesh contamination), or crackling (hard particle in gear mesh). Compare to commissioning audio baseline if available.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2462 Housing temperature touch check<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Touch input-end housing and output-end housing at steady-state load. A differential &gt;15\u00b0C (input hotter than output) suggests input bearing wear. A uniform rise vs. previous baseline of &gt;10\u00b0C suggests increased friction from grease or overload. If housing is too hot to hold (\u224855\u00b0C+ surface), measure with infrared thermometer.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"background: #b45309; padding: 1rem 1.4rem; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;\">\n<div style=\"font-family: 'Courier New',monospace; font-size: 16px; font-weight: 800; color: #fff; white-space: nowrap;\">Every 2,000 h \/ 6-Monthly<\/div>\n<div style=\"font-size: 12px; color: rgba(255,255,255,.8); font-family: -apple-system,sans-serif;\">4 checks \u2014 quantitative measurements, basic instruments<\/div>\n<\/div>\n<div style=\"background: #fef9c3; padding: 1rem 1.4rem;\">\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: .8rem;\">\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2463 Infrared temperature map<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Scan housing surface at rated load with infrared thermometer. Record housing temperature at 4 points (input top, input side, output top, output side). Compare to commissioning baseline. Any point \u226585\u00b0C (surface) triggers load investigation. Document temperature trend.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2464 Vibration amplitude baseline<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Measure vibration amplitude (mm\/s RMS) at housing with accelerometer at rated speed. Compare to commissioning baseline. &gt;200% increase: investigate immediately. 150\u2013200% increase: schedule 1,000h re-check.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2465 Servo drive peak torque log review<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Review servo drive torque log for peaks exceeding 2\u00d7 rated continuous torque. If such peaks occur more than 50 times per production shift, verify service factor was correctly applied in the original specification. Frequent emergency-stop events are particularly damaging and should be counted separately.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2466 Mounting fastener torque check<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Re-torque all housing-to-machine fasteners to specification using calibrated torque wrench. Thermal cycling causes bolt joint settling, particularly in the first 2,000 hours. A loose mounting introduces micro-vibration that loads bearings eccentrically and accelerates wear.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"background: #92400e; padding: 1rem 1.4rem; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;\">\n<div style=\"font-family: 'Courier New',monospace; font-size: 16px; font-weight: 800; color: #fff; white-space: nowrap;\">Every 5,000 h \/ Annual<\/div>\n<div style=\"font-size: 12px; color: rgba(255,255,255,.8); font-family: -apple-system,sans-serif;\">3 checks \u2014 precision instruments, record for trend analysis<\/div>\n<\/div>\n<div style=\"background: #fff7ed; padding: 1rem 1.4rem;\">\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(240px,1fr)); gap: .8rem;\">\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2467 Backlash measurement (critical)<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Measure output shaft backlash at \u00b13% rated torque using dial test indicator at known radius (see A-02 backlash guide). Record against installation baseline. Growth &gt;50% of initial value: schedule replacement within next maintenance window. Growth &gt;100%: replace immediately.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2468 Motor\u2013gearbox concentricity re-check<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Verify input shaft concentricity TIR \u22640.02mm using dial test indicator between motor shaft centreline and gearbox input bore. Thermal cycling and vibration can shift the motor-to-gearbox interface over time. Re-tighten clamping screws to specified torque if any shift detected.<\/p>\n<\/div>\n<div style=\"background: #fff; border: 1px solid #fde68a; border-radius: 6px; padding: .8rem 1rem;\">\n<div style=\"font-size: 12.5px; font-weight: bold; color: #92400e; margin-bottom: .3rem;\">\u2469 Full parameter documentation<\/div>\n<p style=\"font-size: 12px; color: #555; margin: 0; line-height: 1.6;\">Record all 9 measurements above in the unit&#8217;s maintenance log alongside date, accumulated hours, production throughput, and any operating anomalies since last inspection. Trend analysis across three consecutive inspections predicts end-of-life more reliably than any single measurement.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"background: #1c1400; padding: 1rem 1.4rem; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;\">\n<div style=\"font-family: 'Courier New',monospace; font-size: 16px; font-weight: 800; color: #fcd34d; white-space: nowrap;\">Replacement Triggers<\/div>\n<div style=\"font-size: 12px; color: rgba(255,255,255,.7); font-family: -apple-system,sans-serif;\">Any one of these conditions requires immediate replacement scheduling<\/div>\n<\/div>\n<div style=\"background: #fff5f5; padding: 1rem 1.4rem;\">\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr)); gap: .7rem; font-family: -apple-system,sans-serif; font-size: 12px;\">\n<div style=\"background: #fff; border-left: 3px solid #dc2626; padding: .7rem .9rem; border-radius: 0 6px 6px 0; color: #555; line-height: 1.6;\"><strong style=\"color: #991b1b;\">Backlash growth &gt;100%<\/strong> of installation baseline measurement<\/div>\n<div style=\"background: #fff; border-left: 3px solid #dc2626; padding: .7rem .9rem; border-radius: 0 6px 6px 0; color: #555; line-height: 1.6;\"><strong style=\"color: #991b1b;\">Grease visible outside housing<\/strong> \u2014 seal breach confirmed<\/div>\n<div style=\"background: #fff; border-left: 3px solid #dc2626; padding: .7rem .9rem; border-radius: 0 6px 6px 0; color: #555; line-height: 1.6;\"><strong style=\"color: #991b1b;\">Vibration &gt;300%<\/strong> of commissioning baseline at rated speed<\/div>\n<div style=\"background: #fff; border-left: 3px solid #dc2626; padding: .7rem .9rem; border-radius: 0 6px 6px 0; color: #555; line-height: 1.6;\"><strong style=\"color: #991b1b;\">Housing surface &gt;90\u00b0C<\/strong> sustained at normal operating load<\/div>\n<div style=\"background: #fff; border-left: 3px solid #dc2626; padding: .7rem .9rem; border-radius: 0 6px 6px 0; color: #555; line-height: 1.6;\"><strong style=\"color: #991b1b;\">20,000 h L10 life<\/strong> reached \u2014 replace regardless of apparent condition<\/div>\n<div style=\"background: #fff; border-left: 3px solid #dc2626; padding: .7rem .9rem; border-radius: 0 6px 6px 0; color: #555; line-height: 1.6;\"><strong style=\"color: #991b1b;\">Grinding or crackling<\/strong> audible at rated speed \u2014 bearing or gear failure imminent<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 MODULE 8: STORAGE \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">Storage and Pre-Commissioning \u2014 Preventing Grease Separation Before the Unit Is Even Installed<\/h2>\n<p style=\"font-size: clamp(14px,1.8vw,15.5px); color: #333; margin: 0 0 1.2rem; max-width: 820px;\">A factory-sealed EP series unit in transit or warehouse storage is not immune to grease degradation. The primary risk during long-term storage is grease bleed \u2014 the separation of base oil from the thickener matrix under sustained gravitational loading in a stationary gearbox. Bleed creates localised oil pooling and grease-depleted zones, which can cause start-up lubricant film deficiency even in a brand-new unit.<\/p>\n<div style=\"overflow-x: auto; margin-bottom: 1.5rem;\">\n<table style=\"width: 100%; border-collapse: collapse; font-family: -apple-system,sans-serif; font-size: clamp(11px,1.5vw,13px); min-width: 500px;\">\n<thead>\n<tr style=\"background: #1c1400; color: #fff;\">\n<th style=\"padding: .75rem 1rem; text-align: left; border: 1px solid #3d2b00;\">Storage Duration<\/th>\n<th style=\"padding: .75rem .8rem; text-align: center; border: 1px solid #3d2b00;\">Separation Risk<\/th>\n<th style=\"padding: .75rem .8rem; text-align: center; border: 1px solid #3d2b00;\">Storage Condition<\/th>\n<th style=\"padding: .75rem 1rem; text-align: left; border: 1px solid #3d2b00;\">Required Action<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background: #f0fdf4;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">0\u20136 months<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #15803d; font-weight: bold;\">\u0915\u092e<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center;\">Original packaging, 10\u201330\u00b0C, dry<\/td>\n<td style=\"padding: .6rem 1rem; border: 1px solid #e5e7eb; font-size: 12px;\">Rotate output shaft 5 full turns every 3 months to redistribute grease<\/td>\n<\/tr>\n<tr style=\"background: #fefce8;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #e5e7eb; font-weight: 600;\">6\u201312 months<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center; color: #b45309; font-weight: bold;\">\u092e\u0927\u094d\u092f\u092e<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #e5e7eb; text-align: center;\">Temperature-controlled warehouse<\/td>\n<td style=\"padding: .6rem 1rem; border: 1px solid #e5e7eb; font-size: 12px;\">Rotate shaft 10 turns monthly. Inspect for any visible oil weeping at seals before commissioning<\/td>\n<\/tr>\n<tr style=\"background: #fff5f5;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #fecaca; font-weight: bold; color: #dc2626;\">&gt;12 months<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; color: #dc2626; font-weight: bold;\">\u0909\u091a\u094d\u091a<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center;\">\u0915\u094b\u0908<\/td>\n<td style=\"padding: .6rem 1rem; border: 1px solid #fecaca; font-size: 12px; color: #991b1b;\">Contact Korea Ever-Power application engineering for inspection recommendation before commissioning<\/td>\n<\/tr>\n<tr style=\"background: #fef2f2;\">\n<td style=\"padding: .6rem 1rem; border: 1px solid #fecaca; font-weight: bold; color: #7f1d1d;\">&gt;24 months<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center; color: #7f1d1d; font-weight: bold;\">Very High<\/td>\n<td style=\"padding: .6rem .8rem; border: 1px solid #fecaca; text-align: center;\">\u0915\u094b\u0908<\/td>\n<td style=\"padding: .6rem 1rem; border: 1px solid #fecaca; font-size: 12px; color: #7f1d1d;\">Do not commission without Korea Ever-Power inspection. Consider unit replacement if no inspection is possible.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div style=\"background: #fffbeb; border-left: 4px solid #d97706; border-radius: 0 8px 8px 0; padding: 1rem 1.3rem;\">\n<p style=\"font-size: 13px; color: #555; margin: 0; line-height: 1.7;\"><strong style=\"color: #92400e;\">Commissioning procedure for stored units:<\/strong> Before first power-on after storage, manually rotate the output shaft 10\u201315 turns at hand speed while the servo is disabled. This redistributes any separated grease and confirms free rotation. Then run the unit unloaded at 20% rated speed for 5 minutes to allow thermal conditioning. Listen for any abnormal sound before applying load. If any grinding or resistance is felt or heard during hand-rotation, do not commission \u2014 contact Korea Ever-Power for assessment.<\/p>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 MODULE 9: COMMON MISTAKES \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<section style=\"margin-bottom: 3.5rem;\">\n<h2 style=\"font-size: clamp(19px,2.6vw,25px); font-weight: 800; color: #1c1400; border-left: 5px solid #d97706; padding-left: 1rem; margin: 0 0 1.4rem;\">Five Maintenance Mistakes That Void the Lifetime Lubrication Promise<\/h2>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(260px,1fr)); gap: .9rem; margin-bottom: 1rem;\">\n<div style=\"background: #fff5f5; border: 1.5px solid #fecaca; border-radius: 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-size: 13px; font-weight: 800; color: #991b1b; margin-bottom: .4rem;\">\u274c Mistake 1: Adding grease in the field<\/div>\n<p style=\"font-size: 12.5px; color: #555; margin: 0; line-height: 1.65;\">There is no re-greasing port on EP series gearboxes. Any attempt to add grease through a modified access point pressurises the sealed cavity, forces grease past the lip seal, and introduces air and potential contaminants. If you feel the unit &#8220;needs more grease,&#8221; the actual problem is seal failure \u2014 which requires unit replacement, not more grease.<\/p>\n<\/div>\n<div style=\"background: #fff5f5; border: 1.5px solid #fecaca; border-radius: 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-size: 13px; font-weight: 800; color: #991b1b; margin-bottom: .4rem;\">\u274c Mistake 2: Cleaning with solvent solvents<\/div>\n<p style=\"font-size: 12.5px; color: #555; margin: 0; line-height: 1.65;\">Aromatic solvents and chlorinated degreasers dissolve the NBR or FKM lip seal elastomer material. Even brief surface contact over many cleaning cycles causes seal swelling and loss of lip contact force. Use only mild alkaline or water-based cleaners on EP series housing exteriors, and keep cleaning agents away from seal faces entirely.<\/p>\n<\/div>\n<div style=\"background: #fff5f5; border: 1.5px solid #fecaca; border-radius: 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-size: 13px; font-weight: 800; color: #991b1b; margin-bottom: .4rem;\">\u274c Mistake 3: Exceeding rated input speed<\/div>\n<p style=\"font-size: 12.5px; color: #555; margin: 0; line-height: 1.65;\">The maximum input speed for EP-ZDE\/ZDF\/ZDWE\/ZDWF is 4,500 rpm; the recommended continuous speed is 3,000 rpm. Operating above 3,000 rpm increases churning losses non-linearly, raising housing temperature and accelerating PAO base oil oxidation. At 4,500 rpm continuously, grease service life drops significantly below the 20,000h rated figure \u2014 even if load is within torque limits.<\/p>\n<\/div>\n<div style=\"background: #fff5f5; border: 1.5px solid #fecaca; border-radius: 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-size: 13px; font-weight: 800; color: #991b1b; margin-bottom: .4rem;\">\u274c Mistake 4: Ignoring seal weeping as cosmetic<\/div>\n<p style=\"font-size: 12.5px; color: #555; margin: 0; line-height: 1.65;\">Any grease visible outside the housing is not cosmetic \u2014 it is evidence of a seal breach. Seal breaches do not self-heal. A weeping seal means the internal grease quantity is being reduced and contamination is entering simultaneously. Schedule replacement within 500 hours of first visible weeping detection, not at the next annual inspection.<\/p>\n<\/div>\n<div style=\"background: #fff5f5; border: 1.5px solid #fecaca; border-radius: 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-size: 13px; font-weight: 800; color: #991b1b; margin-bottom: .4rem;\">\u274c Mistake 5: Skipping the 5,000h backlash measurement<\/div>\n<p style=\"font-size: 12.5px; color: #555; margin: 0; line-height: 1.65;\">Backlash growth is the most sensitive early indicator of internal gear and bearing wear \u2014 it begins increasing measurably well before noise or temperature anomalies appear. A single backlash measurement at installation plus annual measurements at 5,000h intervals provides the trend data needed to predict end-of-life 3,000\u20135,000 hours before catastrophic failure. Skipping this measurement leaves the unit&#8217;s condition invisible until noise or seizure occurs.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<p><!-- \u2500\u2500 IMAGE 4 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><\/p>\n<div style=\"margin-bottom: 3rem; border-radius: 10px; overflow: hidden; box-shadow: 0 3px 16px rgba(0,0,0,.1);\"><img decoding=\"async\" style=\"width: 100%; height: auto; display: block;\" title=\"Korea Ever-Power Quality Standards \u2014 Lifetime Lubricated Planetary Gearbox\" src=\"https:\/\/planetary-gearboxes.com\/wp-content\/uploads\/2026\/05\/why-choose-us-2.webp\" alt=\"Korea Ever-Power precision planetary gearbox quality certification and manufacturing standards \u2014 sealed lifetime lubrication grease charging verified for 20000 hour service reliability\" \/><\/p>\n<div style=\"background: #fffbeb; padding: .65rem 1.1rem; font-family: -apple-system,sans-serif; font-size: 12px; color: #666;\">Korea Ever-Power quality certification covers grease type, quantity, and distribution verification for every EP series unit before shipment. Factory grease charging is the foundation of the 20,000-hour lifetime lubrication claim.<\/div>\n<\/div>\n<p><!-- \u2500\u2500 CTA \/ CONTACT \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 --><br \/>\n<span id=\"contact\" style=\"display: block; height: 0;\"><\/span><\/p>\n<section style=\"margin-bottom: 3rem;\">\n<div style=\"background: linear-gradient(135deg,#1c1400,#3d2b00); border-radius: 12px; padding: clamp(1.5rem,4vw,2.5rem); color: #fff; display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: center; justify-content: space-between; margin-bottom: 1.8rem;\">\n<div style=\"flex: 1 1 300px;\">\n<div style=\"font-size: clamp(15px,2.2vw,19px); font-weight: 800; color: #fcd34d; margin-bottom: .6rem;\">Questions About Your EP Series Maintenance Interval?<\/div>\n<p style=\"font-size: 13px; color: rgba(255,255,255,.85); margin: 0; line-height: 1.7;\">Korea Ever-Power&#8217;s application engineering team provides application-specific maintenance interval recommendations \u2014 adjusted for your actual housing temperature, duty cycle intensity, and operating environment. If your unit is running hotter than expected, or if you have detected unexpected backlash growth, contact us for a technical assessment before the problem becomes a line stoppage.<\/p>\n<\/div>\n<div style=\"flex: 0 0 auto; text-align: center;\"><a style=\"display: inline-block; background: #fcd34d; color: #1c1400; font-family: -apple-system,sans-serif; font-weight: 800; font-size: 14px; padding: .9rem 1.8rem; border-radius: 6px; text-decoration: none;\" href=\"mailto:sales@planetary-gearboxes.com\">Contact Technical Support \u2192<\/a><\/p>\n<div style=\"font-size: 11px; color: rgba(255,255,255,.5); margin-top: .5rem;\">sales@planetary-gearboxes.com<\/div>\n<\/div>\n<\/div>\n<p><!-- Footer product cards: ZDE, ZDS, ZDWF \u2014 maintenance angle --><\/p>\n<div>\n<div style=\"font-family: -apple-system,BlinkMacSystemFont,sans-serif; font-size: 13px; font-weight: bold; color: #1c1400; letter-spacing: .5px; text-transform: uppercase; margin-bottom: 1rem; padding-bottom: .5rem; border-bottom: 2px solid #fde68a;\">EP Series \u2014 All Lifetime Lubricated, Sealed for Life<\/div>\n<div style=\"display: grid; grid-template-columns: repeat(auto-fit,minmax(200px,1fr)); gap: .9rem;\">\n<div style=\"background: #fff; border: 1.5px solid #fde68a; border-top: 3px solid #d97706; border-radius: 0 0 8px 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-family: -apple-system,sans-serif; font-size: 13px; font-weight: 800; color: #1c1400; margin-bottom: .4rem;\">\u0908\u092a\u0940-\u091c\u0947\u0921\u0921\u0940\u0908 \u0936\u094d\u0930\u0943\u0902\u0916\u0932\u093e<\/div>\n<div style=\"font-size: 11.5px; color: #666; line-height: 1.6; margin-bottom: .7rem;\">Round-flange inline \u00b7 <strong style=\"color: #92400e;\">PAO sealed grease<\/strong> \u00b7 IP54 \u00b7 20,000h rated life \u00b7 \u221225\u00b0C to +90\u00b0C \u00b7 5 frame sizes<\/div>\n<p><a style=\"font-size: 11.5px; color: #d97706; font-weight: bold; text-decoration: none;\" href=\"https:\/\/planetary-gearboxes.com\/hi\/product\/ep-zde-series-round-flange-precision-planetary-gearbox\/\">\u0935\u093f\u0928\u093f\u0930\u094d\u0926\u0947\u0936 \u0926\u0947\u0916\u0947\u0902 \u2192<\/a><\/p>\n<\/div>\n<div style=\"background: #fff; border: 1.5px solid #fde68a; border-top: 3px solid #d97706; border-radius: 0 0 8px 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-family: -apple-system,sans-serif; font-size: 13px; font-weight: 800; color: #1c1400; margin-bottom: .4rem;\">\u0908\u092a\u0940-\u091c\u0947\u0921\u0921\u0940\u0921\u092c\u094d\u0932\u094d\u092f\u0942\u090f\u092b \u0936\u094d\u0930\u0943\u0902\u0916\u0932\u093e<\/div>\n<div style=\"font-size: 11.5px; color: #666; line-height: 1.6; margin-bottom: .7rem;\">Right-angle square-flange \u00b7 sealed grease \u00b7 IP54 \u00b7 compact axial depth \u00b7 ideal for AGV &amp; machine heads in dusty environments<\/div>\n<p><a style=\"font-size: 11.5px; color: #d97706; font-weight: bold; text-decoration: none;\" href=\"https:\/\/planetary-gearboxes.com\/hi\/product\/ep-zdwf-series-right-angle-square-flange-planetary-gearbox\/\">\u0935\u093f\u0928\u093f\u0930\u094d\u0926\u0947\u0936 \u0926\u0947\u0916\u0947\u0902 \u2192<\/a><\/p>\n<\/div>\n<div style=\"background: #fff; border: 1.5px solid #fde68a; border-top: 3px solid #92400e; border-radius: 0 0 8px 8px; padding: 1rem 1.1rem;\">\n<div style=\"font-family: -apple-system,sans-serif; font-size: 13px; font-weight: 800; color: #1c1400; margin-bottom: .4rem;\">\u0908\u092a\u0940-\u091c\u0947\u0921\u0921\u0940\u090f\u0938 \u0936\u094d\u0930\u0943\u0902\u0916\u0932\u093e<\/div>\n<div style=\"font-size: 11.5px; color: #666; line-height: 1.6; margin-bottom: .7rem;\"><strong style=\"color: #92400e;\">\u0906\u0908\u092a\u094065<\/strong> \u00b7 FKM seals for washdown and chemical environments \u00b7 same 20,000h sealed grease \u00b7 1,800 N\u00b7m \u00b7 recommended for all HACCP and outdoor installations<\/div>\n<p><a style=\"font-size: 11.5px; color: #d97706; font-weight: bold; text-decoration: none;\" href=\"https:\/\/planetary-gearboxes.com\/hi\/product\/ep-zds-series-high-stiffness-planetary-gearbox\/\">\u0935\u093f\u0928\u093f\u0930\u094d\u0926\u0947\u0936 \u0926\u0947\u0916\u0947\u0902 \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<div style=\"margin-top: .9rem; text-align: center;\"><a style=\"font-family: -apple-system,sans-serif; font-size: 12.5px; color: #d97706; font-weight: bold; text-decoration: none; border: 1.5px solid #fde68a; padding: .45rem 1.2rem; border-radius: 4px; display: inline-block;\" href=\"\/hi\/product-category\/planetary-gearbox\/\">\u0938\u092d\u0940 5 \u0908\u092a\u0940 \u0938\u0940\u0930\u0940\u091c\u093c \u092c\u094d\u0930\u093e\u0909\u091c\u093c \u0915\u0930\u0947\u0902 \u2192<\/a><\/div>\n<\/div>\n<\/section>\n<p>\u0938\u0902\u092a\u093e\u0926\u0915: \u0938\u0940\u090f\u0915\u094d\u0938\u090f\u092e<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Korea Ever-Power Maintenance Engineering Guide Lifetime Lubrication in Precision Planetary Gearboxes \u2014 Engineering Behind Sealed-for-Life and What Maintenance Is Still Required &#8220;Lifetime lubrication&#8221; is one of the most misunderstood claims in precision drive engineering. It does not mean the gearbox needs no attention for its service life. It means no oil changes, no grease replenishment, [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[965],"tags":[],"class_list":["post-752","post","type-post","status-publish","format-standard","hentry","category-application-and-technical-guid"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/posts\/752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/comments?post=752"}],"version-history":[{"count":1,"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/posts\/752\/revisions"}],"predecessor-version":[{"id":753,"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/posts\/752\/revisions\/753"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/media?parent=752"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/categories?post=752"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/hi\/wp-json\/wp\/v2\/tags?post=752"}],"curies":[{"name":"\u0921\u092c\u094d\u0932\u094d\u092f\u0942\u092a\u0940","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}