{"id":819,"date":"2026-06-15T09:16:41","date_gmt":"2026-06-15T09:16:41","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=819"},"modified":"2026-06-16T00:10:42","modified_gmt":"2026-06-16T00:10:42","slug":"ep-se405-4t-multi-stage-track-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/bs\/proizvod\/ep-se405-4t-multi-stage-track-drive-planetary-gearbox\/","title":{"rendered":"EP-SE405.4T Multi-Stage Track Drive Planetary Gearbox"},"content":{"rendered":"

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EP-SE405.4T \u2014 Multi-Stage Track Drive Planetary Gearbox | 11,000 N\u00b7m, i=26\u201357, 280 N\u00b7m Spring Brake, 40\u201370 Tonne Machine Class<\/h2>\n
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\"SE405.4T<\/p>\n

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11,000 N\u00b7m<\/div>\n
Rated torque<\/div>\n<\/div>\n
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280 N\u00b7m<\/div>\n
Spring brake<\/div>\n<\/div>\n
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i=26\u201357<\/div>\n
Multi-stage<\/div>\n<\/div>\n
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\u226595%<\/div>\n
Efikasnost<\/div>\n<\/div>\n<\/div>\n
\u2190 Korea Ever-Power Track Drive Series<\/span><\/div>\n<\/div>\n
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The EP-SE405.4T<\/strong> is a multi-stage track drive planetary gearbox for crawler undercarriages in the 40\u201370 tonne machine class. Its rotating outer housing \u2014 carrying the track sprocket directly on the drum flange, without any output shaft or coupling \u2014 delivers 11,000 N\u00b7m at selectable ratios from i=26 to i=57, driven by a high-speed axial piston motor at up to 3,500 rpm. The integral spring-applied, hydraulically-released multi-disc brake engages automatically on pilot pressure loss. At ~140 kg, EP-SE405.4T is a physically substantial unit \u2014 sized for machines where the undercarriage weight alone often exceeds 8 tonnes per side.<\/p>\n

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\u26a1 11,000 N\u00b7m Multi-Stage<\/div>\n
Multi-stage epicyclic delivers 11 kN\u00b7m in a rotating-housing package at \u226595% efficiency.<\/div>\n<\/div>\n
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\ud83d\uded1 280 N\u00b7m Spring Brake<\/div>\n
\u00d7i=57 = 15,960 N\u00b7m output-equivalent. Holds \u224842 t on 15\u00b0 slope per drive pair.<\/div>\n<\/div>\n
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\ud83d\udce6 140 kg, \u221225\u00b0C to +90\u00b0C<\/div>\n
Nodular iron housing. Full arctic-to-desert range \u2014 no special configuration required.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Technical Specifications<\/h2>\n

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\u2460 Core Parameters<\/h3>\n
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Parameter<\/th>\nSpecifikacija<\/th>\n<\/tr>\n<\/thead>\n
Nazivni izlazni obrtni moment<\/td>\n11,000 N\u00b7m<\/td>\n<\/tr>\n
Reduction Ratio Range (i)<\/td>\n26 \u2013 57 (Multi-Stage \u2014 specify at order)<\/td>\n<\/tr>\n
Drive Configuration<\/td>\nMulti-Stage Planetary (rotating outer housing)<\/td>\n<\/tr>\n
Maksimalna ulazna brzina<\/td>\n3,500 rpm<\/td>\n<\/tr>\n
Output Speed at 3,500 rpm (i=57)<\/td>\n~61 rpm<\/td>\n<\/tr>\n
Output Speed at 3,500 rpm (i=26)<\/td>\n~135 rpm<\/td>\n<\/tr>\n
Efikasnost<\/td>\n\u2265 95% (multi-stage optimised gear mesh)<\/td>\n<\/tr>\n
Integral Brake Torque<\/td>\n280 N\u00b7m (spring-applied \/ hydraulically released)<\/td>\n<\/tr>\n
Brake Effective Output-Side Hold (i=57)<\/td>\n~15,960 N\u00b7m per drive<\/td>\n<\/tr>\n
Brake Release Pressure (pilot)<\/td>\n15\u201330 bar (confirm with Korea Ever-Power for your circuit)<\/td>\n<\/tr>\n
Materijal ku\u0107i\u0161ta<\/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
Approximate Dry Weight<\/td>\n~140 kg (varies by ratio and motor adapter)<\/td>\n<\/tr>\n
Podmazivanje<\/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
Radna temperatura<\/td>\n\u221225\u00b0C to +90\u00b0C<\/td>\n<\/tr>\n
Oil Change Intervals<\/td>\nFirst at 150 h run-in; every 1,000 h or annually thereafter<\/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

\u2461 Ratio \u00d7 Brake Effectiveness \u2014 i=26 to i=57<\/h3>\n
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Omjer (i)<\/th>\nOutput speed (3,500 rpm input)<\/th>\nBrake output-equivalent<\/th>\nTypical machine \/ application<\/th>\n<\/tr>\n<\/thead>\n
i = 26<\/td>\n~135 rpm<\/td>\n7,280 N\u00b7m \/ drive<\/td>\nLarge tracked screeners \/ fast tramming at 3\u20134 km\/h<\/td>\n<\/tr>\n
i \u2248 33\u201340<\/td>\n~87\u2013106 rpm<\/td>\n9,240\u201311,200 N\u00b7m \/ drive<\/td>\n35\u201350 t excavators \u2014 2\u20133 km\/h balanced travel speed<\/td>\n<\/tr>\n
i \u2248 45\u201350<\/td>\n~70\u201378 rpm<\/td>\n12,600\u201314,000 N\u00b7m \/ drive<\/td>\nLarge drilling rigs, 50\u201360 t piling machines, crawler cranes<\/td>\n<\/tr>\n
i = 57<\/td>\n~61 rpm<\/td>\n15,960 N\u00b7m \/ drive<\/td>\nUltra-slow heavy foundation \/ crane positioning \u2014 <1.5 km\/h<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Brake equivalents at i values between table rows scale linearly: 280 \u00d7 i N\u00b7m per drive. Two-drive total: multiply by 2. Confirm brake hold adequacy for your steepest parking gradient at time of ratio specification.<\/p>\n

\u2462 SE Series \u2014 Where EP-SE405.4T Sits<\/h3>\n
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Model<\/th>\nObrtni moment<\/th>\nOmjer<\/th>\nBrake<\/th>\nTe\u017eina<\/th>\nTarget<\/th>\n<\/tr>\n<\/thead>\n
EP-SE400T1<\/td>\n1,300 N\u00b7m<\/td>\n6.09 (fixed)<\/td>\n130 N\u00b7m<\/td>\n35 kg<\/td>\n3\u20135 t<\/td>\n<\/tr>\n
EP-SE401T1<\/td>\n2,000 N\u00b7m<\/td>\n6.2 (fixed)<\/td>\n270 N\u00b7m<\/td>\n45 kg<\/td>\n6\u201312 t<\/td>\n<\/tr>\n
EP-SE402T2<\/td>\n5,000 N\u00b7m<\/td>\n12.4\u201337.1<\/td>\nNone (std)<\/td>\n75 kg<\/td>\n12\u201325 t<\/td>\n<\/tr>\n
EP-SE403T2<\/td>\n7,000 N\u00b7m<\/td>\n15.4\u201340.0<\/td>\n270 N\u00b7m<\/td>\n85 kg<\/td>\n25\u201340 t<\/td>\n<\/tr>\n
EP-SE405.4T \u2605<\/td>\n11,000 N\u00b7m<\/td>\n26\u201357<\/td>\n280 N\u00b7m<\/td>\n140 kg<\/td>\n40\u201370 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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The five models summarised above represent the Korea Ever-Power SE track drive planetary gearbox range from 1,300 N\u00b7m single-stage to 11,000 N\u00b7m multi-stage. Each step up in torque class reflects a physically larger unit \u2014 more bearing surface area, heavier planet gear cross-sections, thicker nodular iron housing walls. The EP-SE405.4T at 140 kg and 11,000 N\u00b7m is the correct specification when the machine’s required tractive effort exceeds EP-SE403T2’s 7,000 N\u00b7m capacity, and when the 280 N\u00b7m spring brake producing up to 15,960 N\u00b7m effective output-side hold is required as a mandatory parking safety feature for the machine weight class and operational gradient.<\/p>\n<\/section>\n

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\u226595% Efficiency at 11,000 N\u00b7m \u2014 What This Means in Heat and Hydraulic Cost<\/h2>\n
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The Number in Context<\/div>\n

At \u226595% efficiency, the EP-SE405.4T loses at most 5% of the transmitted power as heat. For a 100 kW input (typical for a 45-tonne excavator travel circuit), that is at most 5 kW of heat generated in the gearbox housing at rated load \u2014 less than the heat output of a domestic electric kettle. Compare this with a single-stage unit at the same power: because single-stage units cannot reach 11,000 N\u00b7m in the SE series, the alternative for 40-tonne machines would be two parallel-shaft reducers or a much larger and heavier single-ratio unit. The multi-stage optimised epicyclic achieves more torque multiplication in a shorter axial length, and the gear mesh efficiency is maintained through precision CNC ground helical tooth profiles at each stage.<\/p>\n<\/div>\n

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Hydraulic Circuit Temperature Impact<\/div>\n

Drive efficiency directly affects hydraulic fluid temperature: every percentage point of efficiency lost in the gearbox becomes heat in the hydraulic return circuit. At \u226595% efficiency versus a hypothetical 92% alternative, the EP-SE405.4T generates approximately 3 kW less heat per 100 kW transmitted. On a machine with two 100 kW travel circuits running for 8 hours per day, this prevents roughly 172 MJ of accumulated heat from entering the hydraulic system daily. In hot-climate operation \u2014 Pilbara or Arabian Peninsula, for example \u2014 this difference in fluid temperature directly affects pump and seal life. Multiple field reports across Korea Ever-Power’s installed base have documented hydraulic oil temperature reductions when replacing lower-efficiency legacy drives with EP-SE405.4T units.<\/p>\n<\/div>\n

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Fuel and Power Saving \u2014 The Operating Cost Argument<\/div>\n

In diesel-hydraulic machines, every watt of power lost in the drive-train must be supplied by the engine \u2014 which converts diesel at approximately 35% thermal efficiency. A 5 kW efficiency improvement in the travel drives therefore reduces diesel consumption by approximately 14 kW of thermal input per drive, per hour of travel operation. For a large excavator spending 4 hours per day on travel cycles, across a 250-day construction season, the fuel saving from two improved drives is measurable and cumulative. At commercial diesel prices and for fleet operators running multiple large machines, the \u226595% efficiency specification is not a marketing claim \u2014 it is a recurring cost reduction that compounds over equipment service life.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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140 kg \u2014 Why Drive Mass Scales With Machine Mass<\/h2>\n
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The EP-SE405.4T weighs approximately 140 kg \u2014 65% heavier than the EP-SE403T2 (85 kg), nearly double the EP-SE402T2 (75 kg), and four times the compact EP-SE400T1 (35 kg). This is not incidental. The relationship between drive unit mass and machine class reflects several connected engineering constraints that cannot be addressed any other way.<\/p>\n

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Bearing Capacity: Machine Weight Acts on the Drum Interface<\/strong><\/p>\n

A 50-tonne excavator imposes a static bearing load at the track drive drum\u2013spindle interface proportional to the machine’s weight divided by four track contact zones. At 50 tonnes (490 kN), each final drive absorbs approximately 120 kN of combined radial and axial bearing load \u2014 substantially more than the 80 kN range typical for 30-tonne machines. The oversized taper roller bearings required to sustain this load are physically larger, heavier, and require a larger housing bore diameter. Bearing size drives housing outer diameter, which drives overall unit mass. There is no engineering shortcut: undersized bearings collapse under this static load class, housing fracture follows, and machine downtime results.<\/p>\n<\/div>\n

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Gear Set Mass: Torque Capacity Requires Cross-Section Area<\/strong><\/p>\n

The torque capacity of a planet gear tooth face is proportional to the tooth face width and pitch radius squared. To increase torque from 7,000 N\u00b7m (SE403T2) to 11,000 N\u00b7m (SE405.4T) \u2014 a 57% increase \u2014 while maintaining the same carburised steel tooth stress limits, the gear set requires proportionally larger planet gear dimensions. In a multi-stage planetary arrangement, the mass increase per stage is compounded. The gear set, ring gear drum, and planet carriers in the EP-SE405.4T are all physically larger cross-sections than in the SE403T2, contributing the majority of the 55 kg mass increase from 85 to 140 kg.<\/p>\n<\/div>\n

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Nodular Iron Housing: 11,000 N\u00b7m Reaction Torque on the Structure<\/strong><\/p>\n

When the ring gear drum rotates and drives the sprocket at 11,000 N\u00b7m, the reaction torque on the fixed spindle and chassis mounting is equally 11,000 N\u00b7m. The housing structural wall thickness must sustain this torque without cracking, distorting, or allowing the gear mesh alignment to shift. Nodular (spheroidal graphite) cast iron \u2014 used throughout the SE405.4T \u2014 has a tensile strength of 400\u2013600 MPa and significant ductility compared to grey iron. At 11,000 N\u00b7m, the wall sections are thicker than in the 7,000 N\u00b7m SE403T2, contributing to mass. But the alternative \u2014 thinner walls that deflect under torque reaction \u2014 shifts gear mesh centre distances, accelerating wear and leading to premature failure of the gear teeth themselves.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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MASS PROGRESSION \u2014 SE SERIES<\/p>\n

SE400T1 \u2192 35 kg
\nSE401T1 \u2192 45 kg (+29%)
\nSE402T2 \u2192 75 kg (+67%)
\nSE403T2 \u2192 85 kg (+13%)
\nSE405.4T\u2192 140 kg (+65%)<\/span><\/div>\n
Each mass step reflects a genuine jump in bearing size, gear cross-section, and housing wall thickness \u2014 not assembly additions. A 140 kg drive is the minimum mass for a well-engineered 11,000 N\u00b7m rotating-housing planetary unit in nodular iron.<\/div>\n<\/div>\n
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Installation note<\/p>\n

At 140 kg, EP-SE405.4T installation requires a hoist or lifting sling rated for \u2265200 kg (with safety factor). Never manually lift. Confirm lifting lug or chain wrap positions with Korea Ever-Power dimensional drawing before installation.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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In summary: every kilogram of a track drive planetary gearbox at this scale is there for a functional reason. The 140 kg figure of EP-SE405.4T versus 85 kg of EP-SE403T2 is not over-engineering \u2014 it is the minimum structural mass required to sustain 11,000 N\u00b7m continuously in a rotating-housing epicyclic format, with appropriate bearing, gear, and housing safety margins for the 40\u201370 tonne machine class.<\/p>\n<\/section>\n

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Applications \u2014 40 to 70 Tonne Machine Class<\/h2>\n

The 11,000 N\u00b7m torque class, targeted by this track drive planetary gearbox, represents the global mainstream of large crawler excavators \u2014 the 35\u201355 tonne machines used in major civil engineering, mining, and industrial construction worldwide. These machines require a track drive planetary gearbox that the lighter SE403T2 cannot provide.<\/p>\n

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Large Crawler Excavators \u2014 35\u201360 Tonne<\/h3>\n

The 35\u201355 tonne crawler excavator class is the primary target application for EP-SE405.4T globally. Machines in this class \u2014 used for large-scale trenching, rock breaking on infrastructure projects, and heavy site preparation \u2014 require individual track drives capable of 9,000\u201311,000 N\u00b7m after applying shock load factors for hard rock and deep bucket fill. EP-SE405.4T covers this at ratios from i=33 to i=45. The spring brake provides the mandatory positive mechanical hold required by machine safety standards in many markets for excavators above 35 tonnes operating on grades above 15\u00b0. At i=40, the spring brake equivalent at the sprocket is 11,200 N\u00b7m per drive \u2014 sufficient for the machine’s parking requirement with an adequate safety margin.<\/p>\n<\/div>\n

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Large Rotary Drilling Rigs \u2014 50\u2013100 Tonne Class<\/h3>\n

Large rotary drilling rigs \u2014 bored pile rigs, continuous flight auger (CFA) rigs, and diaphragm wall grabs in the 50\u2013100 tonne class \u2014 require EP-SE405.4T for the undercarriage travel drives. These machines travel slowly (under 1 km\/h during repositioning on site), placing them in the high-ratio end of EP-SE405.4T’s range (i=45\u201357). The 11,000 N\u00b7m capacity handles the full machine weight including the kelly bar, mast, and counterweight during repositioning across soft or sloped ground. The spring brake provides the automatic position hold between bore moves when the engine may be at idle or the travel circuit inactive during pile cage placement.<\/p>\n<\/div>\n

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Large Mobile Crushers \u2014 Heavy Track Drive Demand<\/h3>\n

Tracked primary jaw crushers and impact crushers above 50 tonnes operating weight require EP-SE405.4T for the undercarriage travel. At this weight class, the combination of machine mass plus jaw crusher vibration loads exceeds the structural capacity of the SE403T2’s 85 kg nodular iron housing. EP-SE405.4T’s heavier nodular iron construction sustains the continuous vibration without housing micro-fracture. In limestone, granite, and basalt quarries with aggregate dust and fine silica, the floating mechanical face seals prevent the drive oil contamination that destroys rubber-sealed alternative units within hundreds of hours.<\/p>\n<\/div>\n

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Large Crawler Cranes \u2014 Undercarriage Travel<\/h3>\n

Crawler cranes in the 50\u2013100 tonne gross vehicle weight class use EP-SE405.4T for travel drives. At i=50\u201357 (slowest ratios), the drive provides approximately 14,000\u201315,960 N\u00b7m per side \u2014 the tractive force required to move a fully counterweighted crane across typical compacted site ground. The spring brake is critical during lift operations: with a suspended load, the crane tracks must remain absolutely stationary, and the spring brake provides this hold without requiring hydraulic circuit maintenance. Long repositioning moves between lift picks, with the boom elevated and load on the hook, operate at the i=26\u201335 range for acceptable travel speed.<\/p>\n<\/div>\n

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

At the 40\u201370 tonne class, tracked forestry machines (large feller bunchers and heavy timber haulers) and large tracked agricultural platforms (big-frame combines, soil sampling platforms) require EP-SE405.4T for travel final drives. In timber harvesting, the impact from dragging heavy log bunches across stumps and root systems creates shock loads that require the full gear set and housing mass of EP-SE405.4T to absorb safely. The downstream agricultural multi-output gearboxes<\/a> for PTO-driven cutting heads and conveyor drives operate independently from the EP-SE405.4T travel circuits.<\/p>\n<\/div>\n

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Specialised Tracked Platforms \u2014 Ports, Mining, Tunnelling<\/h3>\n

Port segment handlers, tunnel invert handlers, and heavy autonomous tracked mining platforms require EP-SE405.4T for the track drives. In underground mining, the compact axial length of the rotating-housing design fits within restricted tunnel cross-sections that cannot accommodate larger gearbox units. The worm gear reducers<\/a> serving the platform’s auxiliary cable tensioners or horizontal conveyors operate entirely separately from the EP-SE405.4T travel drive circuits \u2014 the worm unit provides self-locking hold on the cable drum while the spring brake holds the chassis position.<\/p>\n<\/div>\n<\/div>\n

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Quality Benchmarks and Direct Interchange<\/h2>\n
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Component<\/th>\nKorea Ever-Power EP-SE405.4T<\/th>\nLow-Cost Alternatives<\/th>\n<\/tr>\n<\/thead>\n
Gear metallurgy<\/td>\nHigh-alloy steel, deep carburised and precision CNC ground \u2014 deep case hardness resists pitting and tooth shear under 11,000 N\u00b7m shock loads in rock excavation<\/td>\nShallow induction hardening on standard carbon steel \u2014 adequate for static loads, high failure risk under excavator travel impact at this torque class<\/td>\n<\/tr>\n
Sealing system<\/td>\nLifetime floating metal face seals \u2014 positive sealing maintained through continuous rotation at 140 kg unit weight with the drum\u2013spindle bearing load<\/td>\nRubber lip seals \u2014 abrasive wear in 5\u201315 micron quarry dust, oil loss, and bearing contamination within hundreds of hours in hard-rock applications<\/td>\n<\/tr>\n
Main bearings<\/td>\nOversized taper roller bearings \u2014 withstand combined 120+ kN bearing load from 50-tonne machine weight and track tension simultaneously<\/td>\nStandard-sized bearings \u2014 cage collapse under static machine weight at this class; the static load alone exceeds rated capacity<\/td>\n<\/tr>\n
Brake pack<\/td>\nSintered multi-disc wet brake \u2014 280 N\u00b7m consistent hold, oil-cooled, fade-resistant, releases cleanly at 15\u201330 bar pilot, \u221225\u00b0C function confirmed<\/td>\nUnground steel discs \u2014 warp under thermal cycling during repeated engage\/release, lose holding torque progressively, freeze engaged at low temperature<\/td>\n<\/tr>\n
Housing<\/td>\nNodular iron \u2014 ductile, crack-arresting, withstands continuous crushing vibration and 11,000 N\u00b7m torque reaction on the housing wall structure<\/td>\nGrey iron \u2014 brittle, propagates micro-cracks under impact and vibration, housing splits under sustained high-torque operation on uneven terrain<\/td>\n<\/tr>\n
Dimensional fit<\/td>\n1:1 match to Rexroth GFT and Bonfiglioli 700C equivalents at 11,000 N\u00b7m class \u2014 confirmed against specific model before order placement, same day, no charge<\/td>\nApproximate tolerances requiring field shimming, chassis welding, or hydraulic line rerouting \u2014 machine downtime extension while modifications are made<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Cross-Reference Process:<\/strong> Korea Ever-Power maintains a dimensional database covering the primary Rexroth GFT and Bonfiglioli 700C models in the 11,000 N\u00b7m class. When you provide the incumbent drive model number, Korea Ever-Power compares all critical dimensions \u2014 spindle bore diameter and tolerance, drum outer diameter, sprocket bolt circle diameter, hydraulic port thread sizes and positions, motor interface spigot dimensions, and overall axial length \u2014 against the EP-SE405.4T dimensional drawing for the specific ratio ordered. Any dimension that does not match is flagged explicitly in the comparison document returned to you. If a mismatch is identified, Korea Ever-Power advises whether a standard adapter or a minor specification change can resolve it, or whether a different configuration is required. This pre-order verification process prevents the most common cause of field installation problems: assuming dimensional compatibility without explicit confirmation.<\/div>\n

Rexroth and Bonfiglioli are trademarks of their respective owners. Cited for dimensional reference purposes only \u2014 Korea Ever-Power claims no affiliation.<\/em><\/p>\n<\/section>\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 your target travel speed, hydraulic motor specification, machine gross weight, steepest gradient, and incumbent drive model. Korea Ever-Power returns: ratio selection from i=26\u201357; brake hold adequacy calculation (280 N\u00b7m \u00d7 selected i vs your required holding torque); and explicit dimensional confirmation against your current drive \u2014 spindle bore, drum OD, sprocket bolt circle, motor interface \u2014 same business day, no charge, no commitment. For urgent machine-down situations, the same-day response applies.<\/p>\n<\/div>\n

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\ud83d\udd29<\/div>\n

Complete Drive Package \u2014 Motor + Valves + Gearbox<\/h3>\n

EP-SE405.4T is available pre-assembled and function-tested with a matched axial piston motor, integrated overcenter valve, and pressure relief valve as a single part number. The brake function is verified before shipping: pilot pressure applied, drum rotation confirmed free, pressure released, drum confirmed locked. Oil filled to correct level. Arrives ready for chassis mounting and hydraulic line connection only.<\/p>\n<\/div>\n

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

Full Spare Parts Stock \u2014 140 kg Unit Serviced, Not Replaced<\/h3>\n

At 140 kg and proportional cost, a complete unit replacement for a single failed component is economically indefensible. Korea Ever-Power maintains independent stock of all internal wearing items: mechanical face seal kits, taper bearing sets, multi-disc brake packs, sun gear and planet gear assemblies, and housing O-ring sets. Component-level repair is supported \u2014 a failed brake pack is resolved with a brake pack kit, not a complete unit order.<\/p>\n<\/div>\n

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\ud83d\udccb<\/div>\n

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

12 months from commissioning or 18 months from shipment, covering all manufacturing and material defects including the multi-stage gear sets and brake assembly. For OEMs stocking units before machine assembly, warranty begins at commissioning \u2014 providing the full 12 months of in-service coverage regardless of stock time. Warranty replacement components are dispatched independently from stock.<\/p>\n<\/div>\n

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\u23f1\ufe0f<\/div>\n

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

Standard ratio configurations available from Korea Ever-Power stock in 7\u201314 days. Custom ratio and pre-assembled motor packages: 30\u201345 days. For large OEM batch orders where lead time certainty is critical, Korea Ever-Power can confirm production scheduling and batch allocation timelines at enquiry stage. Expedited shipping available on request.<\/p>\n<\/div>\n

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

Arctic to Desert \u2014 No Special Configuration<\/h3>\n

Standard EP-SE405.4T operates at \u221225\u00b0C to +90\u00b0C with standard GL-5 gear oil \u2014 no special configuration required for either climate extreme within this range. Arctic cold-start seal integrity is maintained by the floating metal face seals, whose spring-loaded face contact force is independent of oil viscosity; the GL-5 VG 150 oil at \u221225\u00b0C remains fluid enough for splash lubrication at the gear mesh points from the first rotation. The spring brake Belleville stack retains adequate clamping force at \u221225\u00b0C without preheating. Desert operation at +45\u00b0C ambient \u2014 with the machine running a full travel duty cycle \u2014 maintains housing temperature below the +90\u00b0C limit at the \u226595% efficiency level: a 100 kW circuit generating at most 5 kW of heat in the gearbox, dissipated by the nodular iron housing mass and oil circulation. Hydraulic fluid temperature in the travel return circuit is kept lower by this efficiency level \u2014 directly extending pump and motor seal life in sustained desert operation.<\/p>\n<\/div>\n<\/div>\n

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Field Reviews<\/h2>\n
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J<\/div>\n
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J. Blackwood \u2014 Heavy Excavator Fleet Procurement<\/div>\n
Verified Purchase \u00b7 Nevada, USA<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Running a fleet of 48-tonne autonomous crawler platforms for deep-shaft ore transport in Nevada. Ambient temperature peaks at +48\u00b0C; the silica dust from dry ore is sub-20 micron and destroys rubber seals in a matter of weeks. Previous European drives \u2014 retired after repeated seal failures at 600\u2013800 hours \u2014 were replaced 1:1 with EP-SE405.4T. At 3,200 hours across four units, the floating metal face seals have not been replaced. Hydraulic oil temperatures in the travel circuit are 6\u20138\u00b0C lower than with the old drives, which we attribute to the stated \u226595% efficiency. Spring brake function verified at the annual maintenance: all four brake packs hold within specification. The 140 kg unit weight required proper lifting equipment during installation, but Korea Ever-Power provided the required lifting point specification in the dimensional drawing.<\/p>\n

EP-SE405.4T \u00b7 48-t autonomous ore transport crawler \u00b7 3,200 h, zero seal replacements, 6\u20138\u00b0C lower fluid temp<\/div>\n<\/div>\n
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K.<\/div>\n
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K. Lindstr\u00f6m \u2014 Large Drilling Rig OEM<\/div>\n
Verified Purchase \u00b7 Gothenburg, Sweden<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We manufacture large bored-pile drilling rigs in the 70\u201390 tonne chassis class. At this machine weight, we specify EP-SE405.4T at i=50 for the undercarriage travel drives. The spring brake is a non-negotiable specification in our market \u2014 rig operators park on sloped sites with the kelly bar down and engine off during crew breaks, and the spring brake holds the machine stationary without any hydraulic circuit pressurisation. Korea Ever-Power confirmed the 280 N\u00b7m \u00d7 i=50 = 14,000 N\u00b7m per drive exceeds our parking hold requirement with a comfortable safety margin. Dimensional confirmation to our legacy GFT drives was provided the same day we submitted the inquiry. We have now transitioned our full production range to EP-SE405.4T for this chassis class \u2014 lead times of 7\u201314 days from stock suit our production schedule well.<\/p>\n

EP-SE405.4T, i=50 \u00b7 80-t bored-pile rig \u00b7 spring brake compliance, same-day fit confirmation, 7\u201314 day stock<\/div>\n<\/div>\n
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F<\/div>\n
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F. Tremblay \u2014 Timber & Mining Equipment<\/div>\n
Verified Purchase \u00b7 Alberta, Canada<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We operate heavy timber hauling feller bunchers and heavy pipe-laying tracked machines in Alberta \u2014 operating temperatures range from \u221228\u00b0C in winter to +35\u00b0C in summer. The previous drives failed at low temperature: brake packs freezing engaged at \u221225\u00b0C, requiring heat application before the machine could travel. EP-SE405.4T brake releases cleanly at \u221227\u00b0C with no pre-warming procedure at our standard 18 bar pilot pressure. Cold-start travel on first movement of the day is smooth at VG 150 oil without a warm-up idle period. In summer, operating in clay and organic soil, the floating face seals have maintained clean oil samples across two full operating seasons \u2014 zero water or organic ingress confirmed at each 500-hour oil check. 1:1 swap with legacy drives: chassis unchanged, hydraulic lines unchanged.<\/p>\n

EP-SE405.4T \u00b7 Heavy tracked timber\/pipeline \u00b7 \u221227\u00b0C cold start clean, 2 seasons, zero seal failure<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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

EP-SE405.4T is the highest-capacity model in the SE series covered here. Korea Ever-Power manufactures SE series models extending well beyond 450,000 N\u00b7m for large mining excavators and tunnel boring machines, alongside precision servo 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 SE405.4T (11,000 N\u00b7m, this model). Higher-capacity models available to 450,000 N\u00b7m+ for large mining excavators, shield tunnelling machines, and heavy offshore platforms. Contact Korea Ever-Power for the extended range selection guide.<\/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 other end of the Korea Ever-Power planetarni mjenja\u010d<\/a> range \u2014 from 50 N\u00b7m servo drives to 11,000 N\u00b7m track drives, one manufacturer.<\/p>\n<\/div>\n

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

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

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Technical FAQ<\/h2>\n
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P<\/span>The spec says \u226595% efficiency. Is this higher than the SE402T2 and SE403T2 which claim >94%? How is that possible at higher torque?<\/h3>\n

The \u226595% figure for EP-SE405.4T comes directly from the Korea Ever-Power product specification for this model. The lower >94% figure for SE402T2 and SE403T2 reflects the double-stage (T2) layout’s per-stage losses. The EP-SE405.4T uses a different multi-stage configuration where the individual stage ratios and gear geometry are optimised for efficiency at this torque class. The specific stage count and layout are manufacturer-internal design details \u2014 what matters for engineering purposes is the tested output efficiency figure of \u226595%, which Korea Ever-Power states for this model. If you require independent efficiency verification for a specific application power budget, Korea Ever-Power can provide test data from factory acceptance testing for units produced to your order specification.<\/p>\n<\/div>\n

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P<\/span>Can a 140 kg unit be installed in the field \u2014 or does it require workshop equipment?<\/h3>\n

EP-SE405.4T field installation requires a rated lifting device: a small electric hoist, chain block rated \u2265200 kg, or an excavator auxiliary line with a rated lifting sling. The unit must not be manually lifted by installation technicians. Korea Ever-Power’s dimensional drawing specifies the lifting attachment points (chain wrap positions on the drum housing) for safe suspended installation into the chassis bore. The actual installation procedure \u2014 aligning the spindle into the chassis bore, setting the motor, connecting hydraulic lines \u2014 is performed by two technicians and typically requires 3\u20135 hours per side. The extra weight compared to SE403T2 extends installation time by approximately one hour per side, primarily due to the controlled lift positioning requirement. Korea Ever-Power provides installation sequence documentation with each unit.<\/p>\n<\/div>\n

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P<\/span>What oil volume does the multi-stage unit require, and does the larger housing change the fill procedure?<\/h3>\n

The EP-SE405.4T multi-stage housing contains a significantly larger oil volume than the double-stage SE402T2 or SE403T2 \u2014 typically 4.5\u20137.0 litres depending on ratio configuration and motor adapter. The exact fill volume is specified on the Korea Ever-Power dimensional drawing for your specific configuration. Fill procedure is the same as other SE units: through the highest port in the operating orientation; level check at the side port. At this oil volume, the first run-in oil change at 150 hours removes a larger quantity of wear particles from the multi-stage gear mesh than smaller units \u2014 ensure adequate drain time (oil warm, drain plug down for at least 15 minutes) before refilling. Change interval thereafter: 1,000 hours or annually.<\/p>\n<\/div>\n

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P<\/span>What maintenance schedule applies to the spring brake disc pack?<\/h3>\n

The spring brake multi-disc pack in EP-SE405.4T is a wet-bath unit \u2014 the brake discs operate in the same GL-5 gear oil that lubricates the planetary gear stages. This means the oil at each scheduled change (150 hours first change, then 1,000 hours or annually) carries away any fine metallic wear particles from the brake disc surfaces, serving as an indirect brake condition monitoring tool. If oil samples at the 1,000-hour change show an elevated metallic particle count disproportionate to the gear mesh baseline, this indicates accelerated brake disc wear and warrants a brake pack inspection. The brake disc pack itself \u2014 friction discs, steel separator plates, and the Belleville spring stack \u2014 is available as a replacement kit from Korea Ever-Power stock. Replacement is a workshop procedure requiring partial disassembly of the motor-brake interface. Korea Ever-Power provides the brake pack replacement procedure in the service documentation supplied with each unit. Brake function verification (pilot pressure applied \u2192 drum free, pressure released \u2192 drum locked within one second) should be performed at each annual service interval and after any machine hydraulic system maintenance that involved the pilot circuit.<\/p>\n<\/div>\n

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P<\/span>Is EP-SE405.4T a true drop-in replacement for Rexroth GFT or Bonfiglioli 700C at 11,000 N\u00b7m?<\/h3>\n

For units in the equivalent 11,000 N\u00b7m torque class with matching ratio, EP-SE405.4T is dimensionally matched to Rexroth GFT and Bonfiglioli 700C equivalents at this class. Korea Ever-Power provides an explicit dimensional comparison document \u2014 spindle bore, drum OD, sprocket bolt circle, hydraulic port positions, motor interface \u2014 against the specific legacy model number before any order commitment. The ratio must match (or be close enough for acceptable performance): both the legacy drive and EP-SE405.4T offer multiple ratio options at this torque class. Provide your incumbent drive model number and current ratio to Korea Ever-Power for same-day cross-reference confirmation. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for reference only.<\/em><\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Specify EP-SE405.4T \u2014 Ratio, Brake Adequacy, and Dimensional Fit Confirmed Before Order<\/h2>\n

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

11,000 N\u00b7m \u00b7 i=26\u201357 selectable \u00b7 280 N\u00b7m spring brake \u00b7 \u226595% efficiency \u00b7 \u221225\u00b0C to +90\u00b0C \u00b7 ~140 kg<\/p>\n

Request Quote \u2014 EP-SE405.4T \u2192
\n<\/a><\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"
\n
\u2605 The 40\u201370 Tonne Problem: Why Every SE Model Below This One Is the Wrong Choice<\/div>\n

The SE series builds upward in clear steps: SE400T1 (1,300 N\u00b7m) for 3\u20135 t, SE401T1 (2,000 N\u00b7m) for 6\u201312 t, SE402T2<\/a> (5,000 N\u00b7m) for 12\u201325 t, SE403T2 (7,000 N\u00b7m) for 25\u201340 t. At 40 tonnes, SE403T2 reaches its capacity limit. The EP-SE405.4T, rated at 11,000 N\u00b7m with i=26\u201357 and a 280 N\u00b7m spring brake, covers the 40\u201370 tonne class: large-frame excavators, large crawler cranes, and heavy piling rigs. This is also the highest-volume segment in global crawler excavator production \u2014 the 30\u201350 tonne machines that form the backbone of infrastructure project fleets worldwide.<\/p>\n

At 140 kg dry weight and multi-stage epicyclic reduction, EP-SE405.4T is the most substantial unit in the SE series presented here. The spring brake provides 280 N\u00b7m \u00d7 i at the input, producing up to 15,960 N\u00b7m effective output-side hold per drive at ratio i=57 \u2014 sufficient to park approximately 42 tonnes on a 15\u00b0 slope from the spring brake alone.<\/p>\n<\/div>","protected":false},"featured_media":825,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[966],"product_tag":[],"class_list":["post-819","product","type-product","status-publish","has-post-thumbnail","product_cat-track-drive-planetary-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/product\/819","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/comments?post=819"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/media\/825"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/media?parent=819"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/product_brand?post=819"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/product_cat?post=819"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/bs\/wp-json\/wp\/v2\/product_tag?post=819"}],"curies":[{"name":"radni list","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}