{"id":823,"date":"2026-06-16T00:08:45","date_gmt":"2026-06-16T00:08:45","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=823"},"modified":"2026-06-16T00:08:45","modified_gmt":"2026-06-16T00:08:45","slug":"ep-se406at-multi-stage-track-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/it\/prodotto\/ep-se406at-multi-stage-track-drive-planetary-gearbox\/","title":{"rendered":"EP-SE406AT Multi-Stage Track Drive Planetary Gearbox"},"content":{"rendered":"

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EP-SE406AT \u2014 Multi-Stage Track Drive Planetary Gearbox | 17,000 N\u00b7m, i=23\u2013220, 430 N\u00b7m Spring Brake<\/h2>\n
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\"SE406AT<\/p>\n

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17,000 N\u00b7m<\/div>\n
Rated torque<\/div>\n<\/div>\n
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430 N\u00b7m<\/div>\n
Spring brake<\/div>\n<\/div>\n
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i=23\u2013220<\/div>\n
9.6\u00d7 span<\/div>\n<\/div>\n
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185 kg<\/div>\n
Dry weight<\/div>\n<\/div>\n<\/div>\n
\u2190 Korea Ever-Power Track Drive Series<\/span><\/div>\n<\/div>\n
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IL EP-SE406AT<\/strong> is a multi-stage track drive planetary gearbox producing 17,000 N\u00b7m at selectable ratios from i=23 to i=220. Its rotating outer housing serves directly as the track sprocket hub \u2014 the same inverted epicyclic architecture used throughout the SE series, now in a 185 kg nodular iron package for the 60\u2013100 tonne machine class and specialised ultra-slow platforms. The 430 N\u00b7m spring-applied, hydraulically-released multi-disc brake engages automatically on pilot pressure loss at any selected ratio.<\/p>\n

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\ud83d\udcd0 i=23 to 220<\/div>\n
Same housing, 9.6\u00d7 speed range. Fast repositioning to ultra-slow precision in one product family.<\/div>\n<\/div>\n
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\ud83d\uded1 430 N\u00b7m Brake<\/div>\n
Full-series maximum. \u00d7i=100: 43,000 N\u00b7m output-side hold per drive.<\/div>\n<\/div>\n
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\ud83c\udfd7 185 kg Nodular Iron<\/div>\n
+32% mass vs SE405.4T \u2014 sized for 60\u2013100 t machine bearing loads and 17 kN\u00b7m torque reaction.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Technical Specifications<\/h2>\n

\u2460 Core Parameters<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nSpecifica<\/th>\n<\/tr>\n<\/thead>\n
Rated Output Torque<\/td>\n17,000 N\u00b7m<\/td>\n<\/tr>\n
Reduction Ratio Range (i)<\/td>\n23 \u2013 220 (Multi-Stage \u00b7 9.6\u00d7 span \u00b7 specify at order)<\/td>\n<\/tr>\n
Drive Configuration<\/td>\nMulti-Stage Planetary (rotating outer housing)<\/td>\n<\/tr>\n
Velocit\u00e0 massima di input<\/td>\n3,500 rpm<\/td>\n<\/tr>\n
Output Speed at 3,500 rpm (at i=23)<\/td>\n~152 rpm (fastest \u2014 large tracked crane repositioning)<\/td>\n<\/tr>\n
Output Speed at 3,500 rpm (at i=220)<\/td>\n~16 rpm (slowest \u2014 ultra-slow precision travel)<\/td>\n<\/tr>\n
Efficienza<\/td>\n> 95%<\/td>\n<\/tr>\n
Integral Brake Torque<\/td>\n430 N\u00b7m (spring-applied \/ hydraulically released)<\/td>\n<\/tr>\n
Brake Release Pressure (pilot)<\/td>\n15\u201330 bar (confirm with Korea Ever-Power for specific circuit)<\/td>\n<\/tr>\n
Housing Material<\/td>\nNodular (spheroidal graphite) cast iron<\/td>\n<\/tr>\n
Mounting Type<\/td>\nRotating outer housing flange \u2014 direct sprocket mount (no output shaft)<\/td>\n<\/tr>\n
Dry Weight<\/td>\n~185 kg (varies by ratio and motor adapter)<\/td>\n<\/tr>\n
Lubrificazione<\/td>\nOil bath splash \u2014 API GL-5; ISO VG 150 (below +15\u00b0C) \/ VG 220 (above +15\u00b0C)<\/td>\n<\/tr>\n
Seal System<\/td>\nFloating mechanical face seals (dual-cone metal-to-metal)<\/td>\n<\/tr>\n
Temperatura di esercizio<\/td>\n\u221225\u00b0C to +85\u00b0C \u2014 see thermal note below<\/td>\n<\/tr>\n
Motor Interface<\/td>\nHigh-speed axial piston motors; hydraulic orbit motors<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u26a0 Thermal Note: +85\u00b0C Upper Limit<\/strong> \u2014 The EP-SE406AT operating temperature ceiling is +85\u00b0C housing surface temperature, compared to +90\u00b0C for the EP-SE405.4T. This reflects the higher thermal mass of the 185 kg nodular iron housing accumulating heat at sustained high-load operation. In ambient temperatures above +35\u00b0C with sustained high-duty-cycle travel, ensure adequate clearance around the track frame for natural convection. For continuous high-ambient desert applications, Korea Ever-Power can advise on duty cycle limits or optional extended-temperature seals.<\/div>\n

\u2461 SE Series \u2014 Full Range at a Glance<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n
Modello<\/th>\nCoppia<\/th>\nRapporto<\/th>\nBrake<\/th>\nPeso<\/th>\nTemp.<\/th>\nTarget<\/th>\n<\/tr>\n<\/thead>\n
SE400T1<\/td>\n1,300 N\u00b7m<\/td>\n6.09 fixed<\/td>\n130 N\u00b7m<\/td>\n35 kg<\/td>\n+90\u00b0C<\/td>\n3\u20135 t<\/td>\n<\/tr>\n
SE401T1<\/td>\n2,000 N\u00b7m<\/td>\n6.2 fixed<\/td>\n270 N\u00b7m<\/td>\n45 kg<\/td>\n+85\u00b0C<\/td>\n6\u201312 t<\/td>\n<\/tr>\n
SE402T2<\/td>\n5,000 N\u00b7m<\/td>\n12.4\u201337.1<\/td>\n\u2014<\/td>\n75 kg<\/td>\n+90\u00b0C<\/td>\n12\u201325 t<\/td>\n<\/tr>\n
SE403T2<\/td>\n7,000 N\u00b7m<\/td>\n15.4\u201340.0<\/td>\n270 N\u00b7m<\/td>\n85 kg<\/td>\n+90\u00b0C<\/td>\n25\u201340 t<\/td>\n<\/tr>\n
SE405.4T<\/td>\n11,000 N\u00b7m<\/td>\n26\u201357<\/td>\n280 N\u00b7m<\/td>\n140 kg<\/td>\n+90\u00b0C<\/td>\n40\u201370 t<\/td>\n<\/tr>\n
SE406AT \u2605<\/td>\n17,000 N\u00b7m<\/td>\n23\u2013220<\/td>\n430 N\u00b7m<\/td>\n185 kg<\/td>\n+85\u00b0C<\/td>\n60\u2013100+ t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The complete SE series represented in the table above \u2014 from SE400T1 (1,300 N\u00b7m single-stage) through SE406AT (17,000 N\u00b7m multi-stage, this model) \u2014 uses the same fundamental rotating-housing epicyclic architecture across all six models. The planet carrier is fixed to the machine chassis spindle; the ring gear drum rotates as the output and carries the track sprocket directly on its flange face. Floating mechanical face seals at the drum\u2013spindle interface seal the gear oil throughout. This architectural consistency means a machine designer who has worked with any SE series unit understands the installation, service, and replacement procedure for EP-SE406AT \u2014 the scale is different, but the logic is identical. The 185 kg, 17,000 N\u00b7m, i=23\u2013220 EP-SE406AT is the same concept as the 35 kg, 1,300 N\u00b7m, i=6.09 EP-SE400T1 \u2014 multiplied by the engineering requirements of the 60\u2013100 tonne machine class.<\/p>\n<\/section>\n

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i=23 to i=220 \u2014 What a 9.6\u00d7 Ratio Span Actually Means in the Field<\/h2>\n

Every other SE model in this series has a ratio range that spans at most 2\u20133\u00d7 between minimum and maximum. EP-SE406AT’s span of 220\/23 = 9.6\u00d7 is categorically different \u2014 it places this single product family across application classes that would otherwise require entirely different gearbox types. Here is what each section of the range is for:<\/p>\n

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i = 23\u201335<\/div>\n
~100\u2013152 rpm output<\/div>\n

Fast repositioning class.<\/strong> Large tracked cranes and mobile crushers covering significant site distances between work positions. At i=23 and 3,500 rpm motor input, the machine can travel at approximately 3\u20134 km\/h on a 350 mm sprocket radius \u2014 relatively fast for a 17,000 N\u00b7m class drive. OEMs requiring a high-speed travel option within the same housing envelope as ultra-slow configurations use this ratio band when building machines needing both sprint and load-bearing capability.<\/p>\n<\/div>\n

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i = 50\u201380<\/div>\n
~44\u201370 rpm output<\/div>\n

Standard heavy excavator and crane class.<\/strong> 60\u2013100 tonne crawler excavators and large crawler cranes use this ratio range for normal travel speed of 1.5\u20133 km\/h on typical site ground. At i=60, the spring brake provides 430 \u00d7 60 = 25,800 N\u00b7m effective hold per drive \u2014 sufficient for machines up to 59 tonnes on a 15\u00b0 slope at 350 mm sprocket radius. This is the most common specification range for mainline large excavator OEM applications of EP-SE406AT.<\/p>\n<\/div>\n

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i = 100\u2013150<\/div>\n
~23\u201335 rpm output<\/div>\n

Ultra-slow high-load class.<\/strong> Tunnel segment handlers, large slipform movers, heavy underwater or permafrost platforms where travel is measured in metres per minute rather than km\/h. At i=100, the 430 N\u00b7m brake provides 43,000 N\u00b7m per drive output-side hold \u2014 far exceeding the machine’s parking requirement at this weight class. Hydraulic motors at 3,500 rpm input through i=100 deliver approximately 35 rpm output \u2014 the precise slow-speed range required for controlled segment placement or continuous auger advance in geotechnical drilling.<\/p>\n<\/div>\n

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i = 150\u2013220<\/div>\n
~16\u201323 rpm output<\/div>\n

Extreme slow precision class.<\/strong> Specialised platforms where travel speed requirements approach the structural movement rate rather than transportation speed \u2014 continuous crawler systems on large industrial presses, heavy-load skidding systems, seabed crawler vehicles, arctic ice-breaking platforms. At i=220, the output is approximately 16 rpm from a 3,500 rpm axial piston motor \u2014 enabling millimetric positioning accuracy via hydraulic motor flow control without additional throttling or pressure-compensated variable displacement.<\/p>\n<\/div>\n<\/div>\n

\"track<\/p>\n<\/section>\n

<\/p>\n

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Understanding why i=23\u2013220 is achievable in a single rotating-housing track drive planetary gearbox requires recognising how multi-stage planetary configurations work at this torque class. Each stage contributes a ratio that multiplies with the previous stages. At i=23 (lowest ratio), fewer stages or lower per-stage ratios are engaged, delivering faster output speed. At i=220 (highest ratio), additional stages \u2014 or higher per-stage ratios \u2014 are combined to achieve the deep reduction. The single rotating-housing format is maintained throughout the range because the ring gear drum (which serves as both the final output element and the sprocket mounting hub) is the same physical component regardless of ratio. What changes between a i=23 and i=220 version is the internal arrangement of the planet gear sets, not the external housing interface dimensions. This means a machine designed around the EP-SE406AT spindle bore, drum OD, and sprocket bolt circle dimensions can accept any ratio within the i=23\u2013220 range without chassis or sprocket modification \u2014 a significant advantage for OEM platform design where multiple machine travel speed variants are built from the same chassis.<\/p>\n<\/section>\n

<\/p>\n

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430 N\u00b7m at the Input \u2014 What It Delivers at the Sprocket<\/h2>\n

The EP-SE406AT spring brake torque of 430 N\u00b7m is measured at the input side of the disc pack. The machine-level parking hold is 430 \u00d7 i N\u00b7m per drive. Across the i=23\u2013220 range, this produces effective parking hold from adequate margin at low ratio to extraordinary hold reserve at high ratio.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Ratio (i)<\/th>\nOutput rpm (3,500 input)<\/th>\nBrake output-equiv. \/ drive<\/th>\nHolds @ 15\u00b0 slope (r=350 mm)<\/th>\n<\/tr>\n<\/thead>\n
i = 23<\/td>\n~152 rpm<\/td>\n9,890 N\u00b7m<\/td>\n~22 t (two drives)<\/td>\n<\/tr>\n
i = 50<\/td>\n~70 rpm<\/td>\n21,500 N\u00b7m<\/td>\n~48 t (two drives)<\/td>\n<\/tr>\n
i = 80<\/td>\n~44 rpm<\/td>\n34,400 N\u00b7m<\/td>\n~77 t (two drives)<\/td>\n<\/tr>\n
i = 100<\/td>\n~35 rpm<\/td>\n43,000 N\u00b7m<\/td>\n~97 t (two drives)<\/td>\n<\/tr>\n
i = 150<\/td>\n~23 rpm<\/td>\n64,500 N\u00b7m<\/td>\n~145 t (two drives)<\/td>\n<\/tr>\n
i = 220<\/td>\n~16 rpm<\/td>\n94,600 N\u00b7m<\/td>\n~213 t (two drives)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Parking hold values are calculated as: W = (2 \u00d7 brake_equiv) \u00f7 (sin15\u00b0 \u00d7 0.35). At high ratios (i=150\u2013220), the hold values substantially exceed any realistic application requirement \u2014 this indicates the spring brake is appropriately oversized for fail-safe hold at all operating ratios across the full i=23\u2013220 range. Specify your exact ratio at enquiry for Korea Ever-Power to confirm brake adequacy for your specific gradient and machine weight.<\/p>\n<\/section>\n

<\/p>\n

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Applications Across the Ratio Range<\/h2>\n

The 9.6\u00d7 ratio span of this multi-stage track drive planetary gearbox \u2014 the widest in the Korea Ever-Power SE series \u2014 means EP-SE406AT serves distinctly different application categories within a single product. The ratio selected at order defines which application class the unit serves \u2014 not the gearbox itself.<\/p>\n

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Large Crawler Excavators \u2014 60\u2013100 Tonne<\/h3>\n

The 60\u2013100 tonne crawler excavator class \u2014 representing machines in the range of 70-tonne standard excavators and 90-tonne heavy-duty class \u2014 is the primary mainstream application for EP-SE406AT. These machines require individual track drives capable of 14,000\u201317,000 N\u00b7m with adequate safety margin on hard rock and compacted aggregate work. At i=60\u201380, EP-SE406AT provides the required tractive force at 44\u201358 rpm output speed, corresponding to 2\u20133 km\/h travel speed on a 350 mm sprocket radius. The spring brake at this ratio band provides 25,800\u201334,400 N\u00b7m per drive \u2014 the positive mechanical hold required by safety regulations for excavators above 50 tonnes in many markets. The +95% efficiency at this torque class means measurably lower hydraulic fluid temperature in the travel circuit compared to alternative drives at equivalent torque ratings \u2014 a directly observable operational benefit in hot climates and sustained heavy-duty travel cycles. Korea Ever-Power has confirmed field-measured hydraulic return circuit temperature reductions of 4\u20138\u00b0C when fleets have switched from lower-efficiency legacy drives to EP-SE406AT in comparable applications.<\/p>\n<\/div>\n

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Large Rotary Drilling Rigs \u2014 80\u2013150 Tonne Chassis<\/h3>\n

Large bored pile rigs and diaphragm wall grab rigs in the 80\u2013150 tonne chassis class require EP-SE406AT at i=80\u2013120 for the travel undercarriage. These machines position between bore locations at less than 1 km\/h, requiring high ratio for maximum tractive force under the full weight of the mast, kelly bar, and counterweight. The spring brake holds the machine stationary during crew operations between pile positions, with the kelly bar down and engine at idle. Korea Ever-Power provides dimensional confirmation against your incumbent drive model on the same day as enquiry.<\/p>\n<\/div>\n

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Large Crawler Cranes \u2014 60\u2013200 Tonne Gross Weight<\/h3>\n

Crawler cranes from 60 tonne to 200 tonne gross vehicle weight use EP-SE406AT for the travel undercarriage. Large crane undercarriages require high ratio for slow, precise positioning under full counterweight and boom configuration \u2014 i=80\u2013150 at less than 0.5 km\/h travel speed. The spring brake is essential during lift cycles: the chassis must remain absolutely stationary with the hook loaded. At i=100, the 43,000 N\u00b7m per drive brake equivalent provides mechanical hold far beyond any crane in this weight class on any gradient within the standard working envelope.<\/p>\n<\/div>\n

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Tunnel Segment Handlers and Slipform Systems<\/h3>\n

Tracked tunnel segment handling machines, heavy invert formwork movers, and large slipform concrete pavers require EP-SE406AT at i=150\u2013220 for the extreme slow-travel capability. These machines advance at metres per hour \u2014 a continuous concrete slip mover may travel at 0.2\u20130.5 m\/h during continuous pour \u2014 requiring a track drive capable of precise, steady low-speed output from a conventional high-speed axial piston motor input. At i=220, the 16 rpm output from a 3,500 rpm motor input enables fine speed control via hydraulic motor displacement or flow control without requiring special low-speed motors.<\/p>\n<\/div>\n

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Heavy Agricultural and Forestry Platforms<\/h3>\n

Large-frame tracked forestry machines and heavy tracked agricultural platforms at 60+ tonnes operating weight require EP-SE406AT for travel final drives. In large-scale forestry, machines dragging heavy log bundles across uneven terrain face sustained high tractive force requirements that exceed EP-SE405.4T’s 11,000 N\u00b7m capacity. The downstream agricultural multi-output gearboxes<\/a> serving the cutting heads and conveyor systems operate independently on PTO circuits from the EP-SE406AT travel drives.<\/p>\n<\/div>\n

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Specialised Industrial Tracked Systems<\/h3>\n

Nuclear plant refuelling machines, large precast concrete element movers, heavy seabed crawlers, and high-payload industrial logistics platforms use EP-SE406AT at high ratios (i=100\u2013220) for ultra-slow precision crawling. On these platforms, a separate auxiliary winch or tensioning drive \u2014 commonly a worm gear reducer<\/a> for its self-locking load hold on the cable drum \u2014 operates on a completely separate circuit from the EP-SE406AT travel drives. The spring brake provides chassis position hold when the travel motor is stopped and the auxiliary mechanism is active.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"track<\/p>\n

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185 kg \u2014 What the Mass Delivers, and Quality Benchmarks<\/h2>\n
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Rather than asking why EP-SE406AT weighs 185 kg, the more useful framing is: what does the 185 kg deliver that a lighter unit cannot? Three capabilities are directly funded by the additional mass compared to EP-SE405.4T (140 kg):<\/p>\n

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\u2460 Bearing load capacity for 60\u2013100 t machines<\/strong><\/p>\n

A 80-tonne excavator imposes approximately 160\u2013200 kN of combined axial and radial bearing load at each track drive drum\u2013spindle interface under working conditions. The taper roller bearings in EP-SE406AT are sized for this load class \u2014 physically larger, with wider outer race and bearing roller contact area than in EP-SE405.4T. The housing bore that accommodates these bearings is correspondingly larger, and with it, the housing wall sections and overall mass grow proportionally. There is no lighter alternative that sustains this bearing load in this format without increasing failure risk at field-test load cycles.<\/p>\n<\/div>\n

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\u2461 430 N\u00b7m brake system \u2014 larger spring stack and disc pack<\/strong><\/p>\n

The 430 N\u00b7m spring brake in EP-SE406AT is a physically larger assembly than the 280 N\u00b7m brake in EP-SE405.4T \u2014 more friction disc area, a heavier Belleville spring stack, and a larger annular piston. These components add directly to unit mass. The brake’s wet-disc design means the disc pack also occupies volume within the housing, contributing to the longer and heavier package. The 54% increase in brake torque over EP-SE405.4T (280 to 430 N\u00b7m) requires a proportionally larger brake assembly \u2014 this is not an engineering choice but a physics constraint.<\/p>\n<\/div>\n

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\u2462 i=220 ratio housing \u2014 additional stage depth<\/strong><\/p>\n

Achieving i=220 within a single rotating-housing package requires additional planetary stage depth beyond what EP-SE405.4T needs for i=57. The multi-stage arrangement for i=220 \u2014 whether through additional planet sets, a combined differential arrangement, or a longer primary stage \u2014 occupies axial length within the housing. Additional internal depth means additional housing wall material, additional oil volume, and additional overall mass. EP-SE405.4T’s narrower ratio range (26\u201357) requires less internal stage architecture, contributing to its lower 140 kg mass. The EP-SE406AT pays 45 kg in mass to achieve the 9.6\u00d7 ratio span that EP-SE405.4T cannot provide.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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QUALITY BENCHMARKS<\/p>\n

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Gears:<\/span> High-alloy steel, deep carburised, CNC ground<\/div>\n
Seals:<\/span> Dual-cone floating metal face seals (lifetime)<\/div>\n
Bearings:<\/span> Oversized taper roller (160\u2013200 kN class)<\/div>\n
Brake:<\/span> Sintered multi-disc, oil-cooled, 430 N\u00b7m<\/div>\n
Alloggi:<\/span> Nodular cast iron (400\u2013600 MPa tensile)<\/div>\n
Dimensional:<\/span> Cross-ref to Rexroth GFT \/ Bonfiglioli 700C<\/div>\n<\/div>\n<\/div>\n
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Installation requirement<\/p>\n

At 185 kg, EP-SE406AT requires a lifting device rated \u2265250 kg (with safety factor). Confirm chain wrap positions and lifting attachment method with Korea Ever-Power dimensional drawing before installation. Typical field installation time: 4\u20136 hours per side by two technicians with appropriate hoist.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Korea Ever-Power quality cross-reference:<\/strong> EP-SE406AT is dimensionally matched to equivalent Rexroth GFT and Bonfiglioli 700C models at the 17,000 N\u00b7m torque class (cited for dimensional reference only \u2014 Korea Ever-Power claims no trademark affiliation). For fleet managers replacing failing legacy drives in the field, the EP-SE406AT dimensional confirmation process is the same as for all other SE series models: provide the incumbent model number, and Korea Ever-Power returns a side-by-side dimensional comparison against EP-SE406AT for your selected ratio \u2014 spindle bore diameter and tolerance, drum outer diameter, sprocket bolt circle diameter, hydraulic port sizes and positions, motor interface spigot \u2014 within one business day, at no charge, before any order is placed. If any dimension differs, it is flagged explicitly, and an alternative configuration or adapter is proposed before the machine is taken out of service.<\/p>\n<\/section>\n

<\/p>\n

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Why Korea Ever-Power<\/h2>\n
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\ud83d\udcd0<\/div>\n

Ratio + Dimensional Confirmation Same Day<\/h3>\n

Provide target travel speed (or required output RPM), hydraulic motor specification (model or displacement), machine gross operating weight, maximum parking gradient, and incumbent drive model number. Korea Ever-Power returns same business day: the specific ratio from i=23\u2013220 that meets your kinematic requirement; confirmation that 430 N\u00b7m \u00d7 selected ratio exceeds your parking hold requirement at the specified gradient and machine weight; and explicit dimensional match \u2014 spindle bore diameter and fit class, drum outer diameter, sprocket bolt circle diameter, motor interface spigot, brake pilot port thread and position \u2014 against the Korea Ever-Power dimensional drawing for your ordered ratio. No charge, no order commitment. If the same chassis needs to be built in multiple travel speed variants (a common requirement for OEMs building a product range from the same platform), Korea Ever-Power can provide ratio selection recommendations for each speed variant in one same-day response.<\/p>\n<\/div>\n

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\ud83d\udd29<\/div>\n

Pre-Assembled Package with Brake Verified<\/h3>\n

EP-SE406AT is available pre-assembled with a matched high-speed axial piston motor, integrated overcenter valve, and pressure relief valve, tested as a complete unit. Brake function verified before shipping \u2014 pilot pressure applied, drum confirmed free, pressure released, drum confirmed locked within one second. Oil filled. Arrives ready for chassis mounting and hydraulic line connection only, eliminating motor-gearbox interface and brake function errors at machine assembly.<\/p>\n<\/div>\n

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\ud83c\udf21\ufe0f<\/div>\n

\u221225\u00b0C to +85\u00b0C \u2014 Thermal Boundary<\/h3>\n

The +85\u00b0C upper limit for EP-SE406AT reflects the higher thermal mass of the 185 kg housing. At sustained high-power-density cycles in ambient above +35\u00b0C, the housing temperature must not exceed +85\u00b0C. Korea Ever-Power can advise on duty cycle limits for specific ambient and power conditions. At \u221225\u00b0C, cold-start behaviour with GL-5 VG 150 oil and spring brake function are maintained without preheating procedures \u2014 the metal face seals and Belleville spring stack perform at this lower limit without cold-weather modification.<\/p>\n<\/div>\n

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\ud83d\udee0\ufe0f<\/div>\n

Component-Level Spare Parts \u2014 185 kg Serviced Not Replaced<\/h3>\n

At 185 kg and corresponding unit cost, Korea Ever-Power maintains independent stock of all internal components for EP-SE406AT: 430 N\u00b7m brake disc packs, floating mechanical face seal kits, taper bearing sets for each internal bearing position, sun gear and planet gear assemblies, housing O-ring kits. A failed brake disc pack is a brake pack kit replacement \u2014 not a complete unit order. Korea Ever-Power provides service documentation with each unit covering brake pack and seal replacement procedures.<\/p>\n<\/div>\n

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\ud83d\udccb<\/div>\n

12-Month \/ 18-Month Warranty \u2014 All Stages and Brake<\/h3>\n

Manufacturing and material defects covered for 12 months from commissioning or 18 months from shipment. Warranty covers all internal planetary stages, the brake assembly, and the floating mechanical face seals. For OEMs stocking before machine assembly, the 12-month in-service period begins at commissioning. Warranty component replacement shipped from stock \u2014 no requirement to return the complete 185 kg unit for a warranty claim on a seal kit or brake pack.<\/p>\n<\/div>\n

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\u23f1\ufe0f<\/div>\n

7\u201314 Days Stock \u00b7 30\u201345 Days Custom<\/h3>\n

Standard ratio configurations from Korea Ever-Power stock in 7\u201314 days. Custom ratio or pre-assembled motor package: 30\u201345 days. For large OEM batch orders where production scheduling matters, Korea Ever-Power can confirm batch allocation timelines at enquiry stage. Machine-down emergencies: contact with the incumbent drive model, required ratio, and ship-to location for same-day lead time confirmation.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"track<\/p>\n

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Field Reviews<\/h2>\n
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B<\/div>\n
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B. Okonkwo \u2014 Heavy Excavator OEM Engineering Director<\/div>\n
Verified Purchase \u00b7 Lagos, Nigeria<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Our 85-tonne excavator range was running Rexroth GFT units at three times the cost and 8\u201310 week lead times. Korea Ever-Power dimensional cross-reference to our specific GFT model was returned same day \u2014 spindle bore, drum OD, sprocket bolt circle, motor face, and brake pilot port all confirmed. Field swap on an operational unit by our service team in West Africa: 4.5 hours per side. At i=65, the 430 N\u00b7m \u00d7 65 = 27,950 N\u00b7m per drive spring brake holds the machine solidly on our standard 18\u00b0 acceptance slope. Seal performance through two Lagos wet seasons \u2014 operating in laterite clay that destroys rubber seals in weeks \u2014 has been flawless at 2,900 hours across six units. Oil samples at 1,000-hour changes show no contamination. We have also confirmed that the spring brake holds to specification at our annual maintenance check \u2014 brake pack condition assessed visually at each 500-hour service without requiring removal from the chassis, which Korea Ever-Power confirmed is feasible through the motor interface access port with standard service tools.<\/p>\n

EP-SE406AT, i=65 \u00b7 85-t excavator \u00b7 2,900 h wet clay, zero seal failure, brake confirmed 18\u00b0<\/div>\n<\/div>\n
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UN<\/div>\n
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A. Bergqvist \u2014 Specialised Platform Manufacturer<\/div>\n
Verified Purchase \u00b7 Gothenburg, Sweden<\/div>\n<\/div>\n
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We manufacture heavy tunnel segment handling machines for major tunnelling projects in Scandinavia and Central Europe. Our machines travel at approximately 0.5\u20132 m\/min during segment placement \u2014 a requirement that placed us in the i=150\u2013180 range of EP-SE406AT. At i=160, the 430 N\u00b7m \u00d7 160 = 68,800 N\u00b7m per drive spring brake provides an extraordinary position hold during segment installation cycles \u2014 well beyond anything our previous drives could offer. Korea Ever-Power confirmed the ratio selection and dimensional match within 24 hours of our initial enquiry. The 30-day production lead time for our specific ratio fitted our project schedule. Operating in tunnel environments at constant +20\u00b0C and 90\u201395% relative humidity, the metal face seals have shown zero oil leakage or water ingress across our first two project deployments (total 3,500 hours across four units).<\/p>\n

EP-SE406AT, i=160 \u00b7 Tunnel segment handler \u00b7 3,500 h at 95% RH, zero leakage<\/div>\n<\/div>\n
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P. Mukherjee \u2014 Mining Equipment Fleet Manager<\/div>\n
Verified Purchase \u00b7 Jharkhand, India<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Our open-cast iron ore mining fleet runs 75-tonne excavators across abrasive laterite and magnetite ore floor surfaces, ambient temperature up to +42\u00b0C. We specified EP-SE406AT at i=55 after Korea Ever-Power confirmed the ratio selection and brake adequacy (430 \u00d7 55 = 23,650 N\u00b7m per drive vs our 19-t@15\u00b0 parking requirement). Housing temperature under sustained travel duty at +42\u00b0C ambient has peaked at 78\u00b0C in our worst-case measurements \u2014 within the +85\u00b0C specification. The >95% efficiency has measurably reduced hydraulic return circuit temperature: travel circuit return oil is 5\u00b0C cooler than with our previous drives, extending the charge circuit filter service intervals. At 4,100 hours across eight units, all are operating without bearing, seal, or brake failure. The cost per operating hour including maintenance is substantially below our previous European drive supplier.<\/p>\n

EP-SE406AT, i=55 \u00b7 75-t mining excavator \u00b7 4,100 h, peak 78\u00b0C, zero failures, 5\u00b0C lower return temp<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Korea Ever-Power \u2014 Complete Drive Portfolio<\/h2>\n

EP-SE406AT is the widest-ratio unit presented in this track drive series. Korea Ever-Power manufactures SE series track drives to well beyond 450,000 N\u00b7m for the largest mining and tunnelling machines, alongside high-precision planetary gearboxes at the other end of the torque spectrum.<\/p>\n

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\"Korea<\/div>\n
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Track Drive Planetary Gearboxes \u2014 Full SE Series<\/h3>\n

SE400T1 (1,300 N\u00b7m) through SE406AT (17,000 N\u00b7m, this model). Higher-capacity SE series models available beyond 450,000 N\u00b7m for large mining excavators, shield tunnelling machines, and heavy offshore platforms. Contact Korea Ever-Power for the extended capacity range.<\/p>\n<\/div>\n

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High Precision Planetary Gearboxes \u2014 Servo and CNC<\/a><\/h3>\n

P0 \u22641 arcmin to P2. EP-TM, EP-TNF, EP-TEG, EP-TMR series. The Korea Ever-Power riduttore epicicloidale<\/a> range spans from 50 N\u00b7m servo drives to 17,000 N\u00b7m track drives \u2014 the same manufacturing precision approach applied across the full torque range.<\/p>\n<\/div>\n

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Winch, Slewing, and Wheel Drives<\/h3>\n

Winch drive planetary gearboxes for marine cranes, offshore hoists, and construction lifting equipment; slewing drives for excavator swing and wind turbine yaw; wheel drive units for AWPs and wheeled heavy vehicles. Full heavy-duty industrial transmission portfolio.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Technical FAQ<\/h2>\n
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Q<\/span>How does i=23\u2013220 in a single housing work \u2014 can any ratio between 23 and 220 be specified?<\/h3>\n

The i=23\u2013220 range represents the outer boundary of available configurations within the EP-SE406AT housing class. Not every integer ratio between 23 and 220 is independently available \u2014 the available ratios are a discrete set determined by the planet gear count and stage configurations used in this housing size. Korea Ever-Power’s selection guide covers the available standard ratios within the range. When you provide your required output RPM or target travel speed, Korea Ever-Power selects the nearest available standard ratio and confirms whether it meets your kinematic requirement exactly or within acceptable tolerance. Custom ratios outside the standard set can be manufactured but require a longer lead time (typically 45\u201360 days vs 30\u201345 for standard). Contact Korea Ever-Power with your exact output RPM requirement for same-day ratio availability confirmation.<\/p>\n<\/div>\n

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Q<\/span>Why is the temperature limit +85\u00b0C when EP-SE405.4T is rated to +90\u00b0C?<\/h3>\n

The +85\u00b0C upper limit for EP-SE406AT is a consequence of the higher thermal mass and internal heat generation profile of the 185 kg housing at 17,000 N\u00b7m operation. The larger gear mass and additional stages generate proportionally more internal friction heat per unit time at maximum load, and the housing mass \u2014 while larger \u2014 takes longer to reach thermal equilibrium. The +85\u00b0C figure is the maximum steady-state housing surface temperature under continuous rated-load operation within the specified ambient range. In practice, most EP-SE406AT installations in ambient temperatures below +30\u00b0C will not approach this limit. In +40\u00b0C+ ambient combined with sustained maximum travel duty cycles, the housing should be thermally assessed for specific duty cycle conditions. Korea Ever-Power can provide a thermal calculation for your specific application power and ambient on request. The +5\u00b0C difference from EP-SE405.4T is not a quality deficit \u2014 it reflects a different thermal equilibrium point at the larger unit scale.<\/p>\n<\/div>\n

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Q<\/span>At i=220, can the spring brake still release cleanly? Does the extreme ratio affect brake function?<\/h3>\n

The spring brake operates at the input side of the multi-stage gear train \u2014 not at the output. The pilot pressure acts on the annular brake piston, compressing the Belleville spring stack and separating the disc pack, regardless of the downstream gear ratio selected. From the brake’s perspective, i=220 and i=23 are identical: the same spring force, same piston area, same pilot pressure requirement (15\u201330 bar), same engagement and release behaviour, same engagement time of approximately one second after pilot pressure drops. The ratio amplification that makes 430 N\u00b7m become 94,600 N\u00b7m effective output-side hold at i=220 is a one-way mechanical advantage in the output direction \u2014 the gear train amplifies the brake spring force as it transmits it to the sprocket, but does not impose any additional load on the brake release mechanism in return. Releasing the brake (applying pilot pressure) requires the same hydraulic effort regardless of whether i=23 or i=220 is fitted. This is an important operational consideration for machine designers: the pilot circuit sizing for brake release does not need to be changed when a different ratio is specified within the i=23\u2013220 range.<\/p>\n<\/div>\n

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Q<\/span>Oil volume, first-change interval, and maintenance for a unit at i=220 vs i=23 \u2014 any differences?<\/h3>\n

The oil volume varies slightly by ratio configuration (typically 6.0\u20139.0 litres for EP-SE406AT depending on specific stage arrangement) \u2014 confirm exact fill volume on the Korea Ever-Power dimensional drawing for your ordered ratio. The maintenance schedule is the same regardless of ratio: first oil change at 150 operating hours to clear run-in particles, then every 1,000 hours or annually. At high ratios (i=150\u2013220), the gear tooth speed at the final output stage is very low, but the intermediate stages still operate at intermediate speeds and generate normal wear particle levels during run-in. The 150-hour first change removes particles from all stages. API GL-5 ISO VG 150 (below +15\u00b0C ambient) or VG 220 (above +15\u00b0C) applies regardless of ratio. Do not mix oil grades. API GL-5 extreme pressure gear oil is mandatory for the multi-stage gear sets in EP-SE406AT \u2014 standard API GL-4 oil is not approved for this unit at any ratio or temperature condition.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Related Products<\/h2>\n
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EP-SE405.4T \u2014 11,000 N\u00b7m Multi-Stage<\/a><\/h3>\n

Multi-stage, i=26\u201357, 280 N\u00b7m spring brake, ~140 kg, +90\u00b0C, 40\u201370 t. One step below EP-SE406AT \u2014 appropriate when machine weight and torque fall below EP-SE406AT’s range, or when the wider i=23\u2013220 range is not required.<\/p>\n<\/div>\n

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EP-TM \u2014 Precision Helical Planetary<\/a><\/h3>\n

Servo driven, P0\/P1\/P2 grades, 50\u20132,000 N\u00b7m. CNC, robotics, automation \u2014 the precision end of the Korea Ever-Power planetary range, sharing the same epicyclic architecture as EP-SE406AT at a very different scale.<\/p>\n<\/div>\n

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EP-TNF \u2014 Round-Flange Precision<\/a><\/h3>\n

P1 \u22645 arcmin flange output. Robot arms and CNC rotary tables. \u00d880\u2013292 mm, 6 frame sizes.<\/p>\n<\/div>\n

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EP-TEG \u2014 Ultra-Precision P0 \u22641 arcmin<\/a><\/h3>\n

Per-unit backlash certificate. Semiconductor, 5-axis CNC. Maximum precision at the opposite end of the Korea Ever-Power range.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Specify EP-SE406AT \u2014 Ratio, Brake Adequacy, and Dimensional Fit Confirmed Before Order<\/h2>\n

Provide machine weight, maximum gradient, motor specification, target travel speed or required output RPM, and incumbent drive model. Korea Ever-Power returns ratio selection, brake adequacy calculation, and dimensional confirmation \u2014 same day.<\/p>\n

17,000 N\u00b7m \u00b7 i=23\u2013220 (9.6\u00d7 span) \u00b7 430 N\u00b7m spring brake \u00b7 >95% efficiency \u00b7 \u221225\u00b0C to +85\u00b0C \u00b7 ~185 kg<\/p>\n


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