{"id":815,"date":"2026-06-15T09:06:33","date_gmt":"2026-06-15T09:06:33","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=815"},"modified":"2026-06-16T01:00:23","modified_gmt":"2026-06-16T01:00:23","slug":"ep-se402t2-double-stage-track-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/id\/produk\/ep-se402t2-double-stage-track-drive-planetary-gearbox\/","title":{"rendered":"EP-SE402T2 Double-Stage Track Drive Planetary Gearbox"},"content":{"rendered":"

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EP-SE402T2 \u2014 Double-Stage Track Drive Planetary Gearbox | 5,000 N\u00b7m, i=12.4\u201337.1, 3,500 rpm, No Integrated Brake<\/h2>\n
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\"EP-SE402T2<\/p>\n

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5,000 N\u00b7m<\/div>\n
Torsi keluaran terukur<\/div>\n<\/div>\n
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3,500 rpm<\/div>\n
Max motor input<\/div>\n<\/div>\n
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i=12.4\u201337.1<\/div>\n
Double stage range<\/div>\n<\/div>\n
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>94%<\/div>\n
Efisiensi<\/div>\n<\/div>\n<\/div>\n
\u2190 Korea Ever-Power Track Drive Series<\/span><\/div>\n<\/div>\n
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Itu EP-SE402T2<\/strong> is a double-stage track drive planetary gearbox delivering 5,000 N\u00b7m through two successive planetary stages to cover machine classes from 12 to 25 tonnes \u2014 compact crawler cranes, larger mini-excavators, tracked pile drivers, and tracked aggregate screeners that exceed the single-stage SE401T1’s 2,000 N\u00b7m capacity. The standard unit does not include an integral spring brake; parking safety at this torque class is typically managed through overcenter (counterbalance) valves in the travel circuit, or a motor-integrated brake on custom order. As a double-stage roda gigi planet<\/strong> for tracked machine final drives, it applies the same inverted epicyclic architecture \u2014 fixed spindle, rotating outer drum housing \u2014 across the full ratio range. Specify your ratio, motor interface, and braking requirement at enquiry.<\/p>\n

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\u2699 Two-Stage Epicyclic<\/div>\n
First stage reduces motor speed; second stage multiplies to 5,000 N\u00b7m. Ratio selectable at order.<\/div>\n<\/div>\n
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\ud83d\udd27 3,500 rpm Input<\/div>\n
High-speed axial piston motor compatible \u2014 smaller motor, higher power density vs low-speed orbit motor.<\/div>\n<\/div>\n
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\ud83c\udfd7 Nodular Cast Iron<\/div>\n
High-tensile housing resists deformation under heavy crawling vibration \u2014 maintains gear alignment.<\/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
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Parameter<\/th>\nSpesifikasi<\/th>\n<\/tr>\n<\/thead>\n
Rated Output Torque<\/td>\n5,000 N\u00b7m<\/td>\n<\/tr>\n
Reduction Ratio Range (i)<\/td>\n12.4 \u2013 37.1 (Double Stage \u2014 specify at order)<\/td>\n<\/tr>\n
Number of Stages<\/td>\n2 (Double Stage \u2014 T2)<\/td>\n<\/tr>\n
Max Input Speed<\/td>\n3,500 rpm (rated continuous)<\/td>\n<\/tr>\n
Output Speed Range (at 3,500 rpm input)<\/td>\n~94 rpm (at i=37.1) to ~282 rpm (at i=12.4)<\/td>\n<\/tr>\n
Efisiensi<\/td>\n> 94% (two-stage; each stage ~97%, combined ~0.97\u00b2)<\/td>\n<\/tr>\n
Integral Parking Brake<\/td>\nNot included in standard configuration \u2014 see note below<\/td>\n<\/tr>\n
Parking \/ Holding Method (standard)<\/td>\nOvercenter (counterbalance) valve in travel circuit, or motor-integrated holding<\/td>\n<\/tr>\n
Housing Material<\/td>\nHigh-tensile nodular (spheroidal graphite) cast iron<\/td>\n<\/tr>\n
Mounting Type<\/td>\nRotating outer housing flange \u2014 direct sprocket mount<\/td>\n<\/tr>\n
Approximate Weight<\/td>\n~75 kg dry weight (varies by ratio and motor adapter)<\/td>\n<\/tr>\n
Pelumasan<\/td>\nOil bath splash \u2014 API GL-5 gear oil, ISO VG 150\/220<\/td>\n<\/tr>\n
Operating Temperature Range<\/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
Seal System<\/td>\nFloating mechanical face seals (duo-cone \/ metal-to-metal)<\/td>\n<\/tr>\n
Applicable Motor Type<\/td>\nHigh-speed axial piston motors; hydraulic orbit motors<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u26a0 Braking Note:<\/strong> The standard EP-SE402T2 does not include an integral spring-applied parking brake. Machines using EP-SE402T2 must provide parking hold via the hydraulic circuit (overcenter valves, motor case drain check, or pump centre position) or via a separately specified external brake. An integrated spring-applied brake can be added on custom order \u2014 contact Korea Ever-Power with machine weight, gradient, and required brake torque.<\/div>\n
Engineering context \u2014 why no integral brake at this torque class:<\/strong> At the 5,000 N\u00b7m \/ 12\u201325 tonne machine class, the standard industry practice is hydraulic parking hold via overcenter valves rather than a spring-applied integral brake. This is because the spring brake torque required to hold a 20-tonne machine on a 15\u00b0 slope \u2014 approximately 2 \u00d7 1,500 N\u00b7m at each sprocket output \u2014 would require a very large and heavy spring pack if integrated into the gearbox. The overcenter valve approach provides equivalent or superior holding reliability through the hydraulic circuit without adding this weight and complexity to the gearbox housing. The smaller single-stage SE400T1 (130 N\u00b7m spring brake) and SE401T1 (270 N\u00b7m) benefit from an integral brake because their machine class is lighter and the required brake torque is within the practical range for integration. At EP-SE402T2 scale, hydraulic holding is the industry-standard approach used by Rexroth GFT and Bonfiglioli 700C equivalents at this torque class.<\/div>\n

\u2461 Ratio Selection \u2014 What i=12.4\u201337.1 Means in Practice<\/h3>\n
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Ratio (i)<\/th>\nOutput Speed at 3,500 rpm input<\/th>\nTypical Application Context<\/th>\n<\/tr>\n<\/thead>\n
i = 12.4<\/td>\n~282 rpm output<\/td>\nFast-tramming tracked screeners, pipe-layers needing 3\u20135 km\/h travel<\/td>\n<\/tr>\n
i \u2248 18\u201322<\/td>\n~160\u2013195 rpm output<\/td>\nCompact crawler excavators, general construction \u2014 2\u20133 km\/h travel<\/td>\n<\/tr>\n
i \u2248 25\u201330<\/td>\n~117\u2013140 rpm output<\/td>\nRotary drilling rigs, piling machines \u2014 1.5\u20132 km\/h controlled travel<\/td>\n<\/tr>\n
i = 37.1<\/td>\n~94 rpm output<\/td>\nSlow-travel high-load applications: foundation cranes, pile drivers <1 km\/h<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Output speed based on 3,500 rpm input at rated speed. Actual travel speed depends on sprocket pitch diameter and track pitch. Specify required output RPM or target travel speed and sprocket radius at time of order \u2014 Korea Ever-Power selects the appropriate ratio from the available range.<\/p>\n

The EP-SE402T2 is a track drive planetary gearbox<\/strong> \u2014 the same fundamental architecture as the SE400T1 and SE401T1 in terms of rotating outer housing and floating mechanical face seals \u2014 but with a double-stage gear train that places it in a different machine weight class and operating speed range. The following comparison helps confirm which SE series model fits your specific application.<\/p>\n

\u2462 SE Series Comparison \u2014 Choosing the Right Model<\/h3>\n
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Parameter<\/th>\nEP-SE400T1<\/th>\nEP-SE401T1<\/th>\nEP-SE402T2 \u2605<\/th>\n<\/tr>\n<\/thead>\n
Tahapan<\/td>\nSingle (T1)<\/td>\nSingle (T1)<\/td>\nDouble (T2)<\/td>\n<\/tr>\n
Rated torque<\/td>\n1,300 N\u00b7m<\/td>\n2,000 N\u00b7m<\/td>\n5,000 N\u00b7m<\/td>\n<\/tr>\n
Perbandingan<\/td>\n6.09 (fixed)<\/td>\n6.2 (fixed)<\/td>\n12.4\u201337.1 (selectable)<\/td>\n<\/tr>\n
Max input rpm<\/td>\n1,000<\/td>\n1,000<\/td>\n3,500<\/td>\n<\/tr>\n
Spring brake<\/td>\n130 N\u00b7m<\/td>\n270 N\u00b7m<\/td>\nNone (standard)<\/td>\n<\/tr>\n
Berat<\/td>\n~35 kg<\/td>\n~45 kg<\/td>\n~75 kg<\/td>\n<\/tr>\n
Target machine<\/td>\n3\u20135 t<\/td>\n6\u201312 t<\/td>\n12\u201325 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

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Inside the Double-Stage Architecture<\/h2>\n
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Understanding why double-stage matters \u2014 and why single-stage units cannot simply be made larger to reach 5,000 N\u00b7m in the same form factor.<\/p>\n

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First Stage \u2014 Speed Reduction, Primary Torque Split<\/strong><\/p>\n

Motor input (up to 3,500 rpm) enters the first sun gear. The first set of planet gears orbits the sun, walking along the fixed first ring gear. Because the ring gear is stationary, the planet carrier rotates at reduced speed \u2014 approximately the motor speed divided by the first-stage ratio. Load is split simultaneously across three or four planet gears in mesh, which is the fundamental reason planetary gearboxes can handle high torque in a small envelope: no single gear mesh carries the full load. The first-stage carrier output becomes the input driver for the second stage.<\/p>\n<\/div>\n

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Second Stage \u2014 Final Torque Multiplication to 5,000 N\u00b7m<\/strong><\/p>\n

The second stage repeats the epicyclic action on the already-reduced speed output of the first carrier. The second set of planet gears meshes with the second ring gear \u2014 which in the EP-SE402T2 is integral to the rotating outer housing drum. The second carrier is the fixed structural element (connected to the machine spindle). The ring gear drum, now spinning at the combined reduction of both stages (i=12.4 to 37.1), carries the track sprocket and drives the machine. Two stages of torque multiplication produce 5,000 N\u00b7m in a housing that fits within standard crawler frame dimensions.<\/p>\n<\/div>\n

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Nodular Cast Iron Housing \u2014 Why This Material at This Torque Class<\/strong><\/p>\n

At 5,000 N\u00b7m, the forces transmitted through the housing during pivot turns and hard terrain impacts are considerably higher than in the single-stage models. The EP-SE402T2 uses a nodular (spheroidal graphite) cast iron housing rather than standard grey iron. The spherical graphite inclusions in nodular iron act as crack arrestors \u2014 where grey iron micro-fractures and propagates cracks under impact, nodular iron deforms slightly and arrests the crack. Nodular iron also has higher tensile strength (~400\u2013600 MPa vs ~100\u2013200 MPa for grey iron). The housing remains rigid enough to maintain gear alignment while being tough enough to withstand the shock loads of a 20-tonne machine crossing a boulder field.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Selecting the Right Ratio \u2014 Four Parameters to Specify at Order<\/h2>\n

Unlike single-stage track drives \u2014 where the ratio is fixed by the single planetary stage geometry and cannot be varied within the same housing class \u2014 the EP-SE402T2 double-stage design accommodates a range of ratios (i=12.4 to 37.1) by varying the individual stage ratios while maintaining the same overall housing dimensions and sprocket interface. This means the same EP-SE402T2 housing can serve machines with very different travel speed requirements: a tracked screener needing 4 km\/h tramming speed and a piling rig needing 0.6 km\/h positioning speed can both use the same track drive planetary gearbox family, at different specified ratios. To select the correct ratio for your application, four parameters are required at order.<\/p>\n

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\u2460 Target Travel Speed<\/div>\n

Required machine travel speed in km\/h (or output RPM at full pump flow). Combined with sprocket pitch radius, this defines the required output RPM: i = n_motor \u00f7 n_output<\/code>. Example: 3,000 rpm motor, 160 rpm required output \u2192 i = 18.75, select i\u224818\u201320 from available range.<\/p>\n<\/div>\n

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\u2461 Required Drive Torque<\/div>\n

Calculate: T = W \u00d7 (sin\u03b8 + f\u00b7cos\u03b8) \u00d7 r \u00f7 2<\/code> where W = gross weight (N), \u03b8 = max gradient, f = rolling resistance (0.10\u20130.30), r = sprocket radius (m). Apply shock factor 1.5\u20132.0 for rock\/abrupt terrain. Must be \u2264 5,000 N\u00b7m per drive.<\/p>\n<\/div>\n

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\u2462 Motor Speed at Max Pump Flow<\/div>\n

Verify: n = Q \u00d7 1000 \u00f7 (V \u00d7 \u03b7_v)<\/code>. Must stay \u2264 3,500 rpm. For most axial piston motors paired with EP-SE402T2, motor displacement of 45\u201390 cc\/rev at pump flows of 80\u2013200 L\/min will be within this limit. Confirm your specific motor and pump combination.<\/p>\n<\/div>\n

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\u2463 Parking \/ Holding Method<\/div>\n

Specify how parking hold will be achieved: (a) overcenter valve in travel circuit (most common at this class), (b) motor case drain check valve, or (c) integrated spring brake on custom order. Provide the machine’s maximum parking gradient and gross weight \u2014 Korea Ever-Power can specify the correct overcenter valve setting or optional brake torque.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Where 5,000 N\u00b7m Gets Used<\/h2>\n

The following six application categories represent the primary markets for the EP-SE402T2 track drive planetary gearbox at the 12\u201325 tonne machine class. Each has distinct ratio, speed, and braking requirements \u2014 matched to the selectable i=12.4\u201337.1 range.<\/p>\n

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Compact Crawler Excavators \u2014 12\u201320 Tonne Class<\/h3>\n

This is the primary market for EP-SE402T2 globally. A 15-tonne excavator working on a 25\u00b0 gradient requires approximately 3,200\u20134,000 N\u00b7m per track drive after applying shock load factors for hard ground and loaded bucket positioning \u2014 within EP-SE402T2’s 5,000 N\u00b7m rated capacity. The selectable ratio allows OEMs to configure the same drive for two-speed variants (high-speed tramming ratio vs high-torque digging travel ratio) by specifying different i values in the same housing.<\/p>\n<\/div>\n

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Rotary Drilling and Pile Drivers<\/h3>\n

Tracked rotary drilling rigs in the 15\u201330 tonne class require the higher ratios in the EP-SE402T2 range (i=30\u201337.1) for slow, precise repositioning between bore locations \u2014 typically 2\u20135 metre moves at less than 0.8 km\/h, carrying the full weight of the mast, rotary head, kelly bar, and drill string suspended in the derrick. At i=37.1 and a 3,500 rpm maximum motor speed, the output speed is approximately 94 rpm \u2014 and with a 220 mm sprocket radius, travel speed is approximately 0.7 km\/h at full motor flow. This is precisely the slow-positioning speed class this ratio is designed for. The 3,500 rpm input rating allows the rig’s high-flow hydraulic pump to serve the travel circuit with a high-speed, small-displacement axial piston motor \u2014 eliminating the need for a separate low-flow motor circuit for travel positioning that older rig designs required.<\/p>\n<\/div>\n

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Mobile Crushing Plants and Aggregate Screeners<\/h3>\n

Tracked impact crushers and jaw crushers above 15 tonnes operating weight require EP-SE402T2 for the travel drive. The nodular cast iron housing handles the continuous high-amplitude vibration from the crushing mechanism \u2014 vibration levels that fracture grey iron housings in lighter-duty drives. The floating mechanical face seals prevent the fine silica and limestone dust generated by crushing from penetrating the gear oil.<\/p>\n<\/div>\n

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

Compact crawler cranes in the 15\u201340 tonne lifting class use EP-SE402T2 for the travel undercarriage drives. Travel speed requirements are slow (typically 0.5\u20131.5 km\/h), which directs selection toward the higher ratio end (i=30\u201337.1) to maximise available tractive force at the track. Parking hold is managed by the crane’s travel spool centre position and overcenter valves \u2014 no integral spring brake is required.<\/p>\n<\/div>\n

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Heavy Tracked Agricultural Equipment<\/h3>\n

Large-frame tracked sugar cane harvesters and tracked tractors above 14 tonnes operating weight exceed the EP-SE401T1’s 2,000 N\u00b7m capacity and require EP-SE402T2 for the track final drives. The wider ratio range suits agricultural harvest cycles where tramming speed between field sections differs significantly from working speed through the crop rows. The downstream agricultural multi-output gearboxes<\/a> for the cutting platform and elevator operate on a separate PTO circuit from the EP-SE402T2 travel drives.<\/p>\n<\/div>\n

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Tunnelling and Tracked Segment Handlers<\/h3>\n

Tracked segment handling machines in tunnel boring operations and underground construction require precise low-speed positioning of heavy concrete ring segments \u2014 exactly the application profile suited to EP-SE402T2 at i=30\u201337.1. The high-speed input capability allows the machine’s main hydraulic pump to serve both travel and handling functions without a separate low-flow circuit for the travel motor. Auxiliary winch drives on the same machine typically use a worm gear reducer<\/a> for the self-locking load hold function.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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Why Quality Matters More at 5,000 N\u00b7m<\/h2>\n

A single-stage track drive failure on a 5-tonne machine grounds a small machine. The same failure on a 20-tonne excavator on a commercial construction project can shut down an entire site. At the EP-SE402T2 torque and machine weight class, component quality is not an optional upgrade \u2014 it is the primary reliability factor.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Component<\/th>\nKorea Ever-Power EP-SE402T2<\/th>\nTypical Low-Cost Double-Stage Alternatives<\/th>\n<\/tr>\n<\/thead>\n
Housing<\/td>\nNodular (spheroidal graphite) cast iron \u2014 ductile, crack-arresting, high tensile strength under impact<\/td>\nGrey cast iron \u2014 brittle under vibration; micro-fractures propagate to housing splits at high torque<\/td>\n<\/tr>\n
Gear metallurgy<\/td>\nHigh-alloy steel, deep carburised and precision ground \u2014 resists tooth pitting and shear under shock load peaks<\/td>\nStandard carbon steel, shallow induction hardening \u2014 high failure risk under crawler impact loads on hard ground<\/td>\n<\/tr>\n
Main bearings<\/td>\nOversized taper roller bearings \u2014 handles combined radial and axial forces from machine weight and track tension simultaneously<\/td>\nUndersized standard bearings \u2014 cage collapse under static machine weight, accelerated by 5,000 N\u00b7m ring gear reaction forces<\/td>\n<\/tr>\n
Sealing system<\/td>\nLifetime floating metal face seals \u2014 positive differential pressure sealing, impervious to abrasive slurry and pressure washing<\/td>\nRubber lip seals \u2014 rapid abrasive wear in rock dust environments, oil loss within hundreds of operating hours<\/td>\n<\/tr>\n
Dimensional fit<\/td>\n1:1 Rexroth GFT \/ Bonfiglioli 700C equivalent \u2014 confirmed against specific model at no-charge pre-order cross-reference<\/td>\nApproximate tolerances requiring field shimming, adapter welding, or hydraulic line rerouting<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

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Installation Notes \u2014 Double-Stage Specific Considerations<\/h2>\n

The EP-SE402T2 installation sequence follows the same fundamental steps as the single-stage SE models, with three additional considerations specific to double-stage units and the absence of an integral spring brake.<\/p>\n

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\u2460 Chassis Bore and Spindle Fit \u2014 Tighter Tolerance at 5,000 N\u00b7m<\/div>\n

At 5,000 N\u00b7m output, the reaction torque on the spindle-chassis interface is substantially higher than in single-stage units. Measure the chassis spindle bore with a telescoping gauge and confirm it matches the EP-SE402T2 spindle OD within the tolerance stated on the Korea Ever-Power dimensional drawing. Any clearance fit that would be acceptable in a lighter unit may result in fretting and micro-movement at the spindle-bore interface under the higher torque reaction forces of the double-stage drive. Clean all burrs, rust, and paint from the bore contact surface before fitting.<\/p>\n<\/div>\n

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\u2461 Oil Volume \u2014 Larger Fill for Two-Stage Housing<\/div>\n

The EP-SE402T2 double-stage housing contains a significantly larger oil volume than the single-stage SE400T1 or SE401T1 \u2014 approximately 2.5\u20133.5 litres depending on ratio configuration and motor adapter. Fill through the highest port in the operating orientation using filtered API GL-5 gear oil. The oil must submerge the lower gear mesh of the second stage for splash lubrication to reach both stages effectively. Confirm the exact fill volume and fill\/level\/drain port positions on the Korea Ever-Power dimensional drawing for your specific ratio variant before filling.<\/p>\n<\/div>\n

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\u2462 Overcenter Valve Setup \u2014 Critical Without Integral Spring Brake<\/div>\n

Because the EP-SE402T2 standard configuration has no integral spring brake, parking hold is the responsibility of the hydraulic circuit. If overcenter (counterbalance) valves are specified for the travel circuit \u2014 the most common approach for this machine class \u2014 they must be set to the correct back-pressure before initial machine travel. The setting should be high enough to prevent motor rotation (and thus chassis movement) under machine weight on the steepest parking slope, but not so high that it prevents smooth motor acceleration during initial travel engagement. Korea Ever-Power’s application engineering team can calculate the recommended overcenter valve setting based on your machine weight, gradient, and motor displacement.<\/p>\n<\/div>\n

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\u2463 High-Speed Motor Spline Engagement<\/div>\n

High-speed axial piston motors (rated to 3,500 rpm) typically have smaller shaft diameters and finer spline specifications than the low-speed orbit motors used with single-stage drives. Confirm the motor spline specification \u2014 tooth count, module, and fit class \u2014 against the EP-SE402T2 input bore specification. Insert the motor output shaft into the sun gear bore until full spline engagement depth is achieved and confirmed by visual reference or depth measurement. Torque the motor-to-gearbox fasteners in a cross pattern to the motor manufacturer’s torque specification.<\/p>\n<\/div>\n

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\u2464 Run-In at 50% Load \u2014 Both Stages Require Seating<\/div>\n

The double-stage design has two sets of gear tooth surfaces that require micro-seating during run-in: the first stage planet set and the second stage planet set. Operate at approximately 50% maximum load for the first 10 hours. Both stages generate fine metal wear particles during run-in \u2014 the larger the gear set, the more particles are generated. The first oil change at 150 hours is particularly important for the EP-SE402T2’s larger oil volume, as the particle concentration at 150 hours reflects two stages of run-in wear rather than one. Drain while warm; refill with fresh GL-5 oil.<\/p>\n<\/div>\n

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\u2465 Confirm Parking Safety Protocol with the Machine Operator<\/div>\n

Because the EP-SE402T2 does not have an integral spring brake, the machine operator must understand the parking procedure specific to this configuration. On machines using overcenter valves for parking hold \u2014 the standard approach for this planetary gearbox class \u2014 verify that the travel spool returns to centre position when the control is released, and that the overcenter valves lock before the machine is left unattended on a slope. If the machine application requires a spring-applied fail-safe brake independent of the hydraulic circuit \u2014 for instance, in unmanned autonomous operation or in applications where the hydraulic system could be inadvertently vented \u2014 specify this requirement at order time so Korea Ever-Power can include the optional integrated brake.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

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

Ratio Confirmation Before Commitment<\/h3>\n

Korea Ever-Power reviews your motor speed, target travel speed, sprocket pitch radius, and required machine travel speed \u2014 and returns the specific ratio selection from the i=12.4\u201337.1 range, same business day. The selection process confirms output RPM at your operating motor speed, verifies the selected ratio is within the available double-stage configurations, and checks that the resulting output speed meets your machine’s travel cycle requirements for both fast tramming and working travel. If no standard ratio precisely matches your kinematic requirement, custom ratio configurations are available \u2014 discuss at the enquiry stage before any order commitment.<\/p>\n<\/div>\n

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\ud83d\udd29<\/div>\n

Pre-Assembled Drive Package Available<\/h3>\n

EP-SE402T2 is available pre-assembled with a matched high-speed axial piston motor, integrated overcenter (counterbalance) valve, and pressure relief valve as a single tested and function-verified assembly. Korea Ever-Power sets the overcenter valve to the back-pressure calculated for your machine weight and maximum parking gradient before shipping \u2014 so the assembly arrives with the parking hold function verified, not requiring field setting by the machine assembler. This eliminates the motor-gearbox interface fit risk and the overcenter valve calibration step from your machine assembly process. Specify machine gross weight, steepest parking gradient, and sprocket pitch radius when ordering the pre-assembled package.<\/p>\n<\/div>\n

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

Long-Term Spare Parts Support<\/h3>\n

Korea Ever-Power maintains dedicated stock of EP-SE402T2 internal components, covering both planetary stages: first-stage sun gear, first-stage planet set and carrier, second-stage sun gear, second-stage planet set and carrier, complete mechanical face seal kits, taper roller bearing sets for both the first and second stage output bearings, housing O-ring kits, and motor adapter fastener sets. Because the EP-SE402T2 is a double-stage unit with two independent gear sets that can wear or fail separately, parts are catalogued and stocked per-stage \u2014 a first-stage gear replacement does not require purchasing second-stage components. Parts can be dispatched from stock with a 24\u201348 hour lead time for standard seal and bearing items.<\/p>\n<\/div>\n

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\ud83d\udccb<\/div>\n

12-Month Commissioning Warranty<\/h3>\n

12 months from commissioning or 18 months from shipment, covering manufacturing and material defects. Warranty begins at commissioning \u2014 giving OEMs who stock before assembly a full 12-month in-service protection period. Warranty coverage includes both planetary stages and housing.<\/p>\n<\/div>\n

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\u23f1\ufe0f<\/div>\n

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

Standard ratio configurations ship in 7\u201314 days from Korea Ever-Power stock. Custom ratio specifications and motor package assemblies: 30\u201345 days. For emergency machine-down situations, contact Korea Ever-Power with the machine model and required ratio for same-day lead time confirmation.<\/p>\n<\/div>\n

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

\u221225\u00b0C to +90\u00b0C \u2014 Widest Temp Range in SE Series<\/h3>\n

EP-SE402T2 shares the \u221225\u00b0C cold-start capability of EP-SE401T1 but extends the upper limit to +90\u00b0C \u2014 matching the EP-SE400T1 and exceeding the EP-SE401T1’s +85\u00b0C. The nodular iron housing’s superior thermal mass helps dissipate heat from two stages of gear mesh friction, which contributes to the higher upper temperature tolerance at this torque class.<\/p>\n<\/div>\n<\/div>\n

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

<\/p>\n

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Field Reviews<\/h2>\n
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4.9<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n
Based on 95+ verified OEM orders<\/div>\n<\/div>\n
\n
\n
\n

5 \u2605<\/span><\/p>\n

\n
<\/div>\n<\/div>\n

92%<\/span><\/p>\n<\/div>\n

\n

4 \u2605<\/span><\/p>\n

\n
<\/div>\n<\/div>\n

7%<\/span><\/p>\n<\/div>\n

\n

\u22643 \u2605<\/span><\/p>\n

\n
<\/div>\n<\/div>\n

1%<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n
\n
99%<\/div>\n
Akan memesan ulang<\/div>\n<\/div>\n
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<1%<\/div>\n
Tingkat kegagalan lapangan<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n
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\n
R<\/div>\n
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R. Zawadzki \u2014 Excavator OEM Drive-Train Engineer<\/div>\n
Verified Purchase \u00b7 Pozna\u0144, Poland<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

EP-SE402T2 at i=21 on our 16-tonne crawler excavator platform. We were previously using a European double-stage drive at 3\u00d7 the cost with a 12-week lead time. Korea Ever-Power dimensional cross-reference confirmed the match to our spindle bore and sprocket bolt circle same day. Field swap by two technicians in four hours per side \u2014 no chassis modification. At 2,500 hours of clay trenching and rock excavation, both drives are running cleanly. The nodular iron housing shows no cracking or deformation despite the repeated hard-ground impacts we inflicted during acceptance testing.<\/p>\n

EP-SE402T2, i=21 \u00b7 16-t crawler excavator \u00b7 2,500 h clay + rock, no housing defects<\/div>\n<\/div>\n
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\n
H<\/div>\n
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H. Nakamura \u2014 Mobile Crusher OEM<\/div>\n
Verified Purchase \u00b7 Osaka, Japan<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We build 18-tonne tracked jaw crushers for Japanese quarry and demolition contractors. The key challenge is continuous vibration from the crusher jaw mechanism \u2014 previous drives using grey iron housings were developing micro-cracks at the housing flange after 1,200\u20131,500 hours. Switched to EP-SE402T2 with nodular cast iron housing 18 months ago. Zero housing cracks across six units at 1,800\u20132,100 hours. The seal durability in granite fines is excellent \u2014 oil samples at each 1,000-hour change show no silica ingress. The 94%+ efficiency has also reduced hydraulic fluid temperature in the travel circuit by approximately 6\u00b0C.<\/p>\n

EP-SE402T2 \u00b7 18-t tracked crusher \u00b7 6 units, 2,100 h, zero housing cracks vs previous grey iron<\/div>\n<\/div>\n
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\n
M<\/div>\n
\n
M. Carvalho \u2014 Large-Scale Sugarcane Harvest Manager<\/div>\n
Verified Purchase \u00b7 S\u00e3o Paulo, Brazil<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Our tracked sugarcane harvesters run at 16\u201318 tonnes operating weight through acidic clay soils in the S\u00e3o Paulo state \u2014 working two-shift harvest cycles for 5\u20136 months per year. At this weight class, EP-SE401T1 was at its limit. We moved to EP-SE402T2 at i=18 for the travel final drives. After four harvest seasons \u2014 approximately 4,000 total operating hours per unit \u2014 the mechanical face seals remain intact with zero oil contamination in samples. The ratio i=18 gives us 2.8 km\/h travel speed between rows with our 195 mm sprocket radius, which matches our harvest cycle timing perfectly. ROI versus the European drives we previously used is substantial.<\/p>\n

EP-SE402T2, i=18 \u00b7 17-t tracked harvester \u00b7 4,000 h, 4 harvest seasons, zero seal failure<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

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

EP-SE402T2 sits at the upper end of the entry SE series. Korea Ever-Power also manufactures high-precision servo planetary gearboxes, winch drives, slewing drives, and wheel drives for the full spectrum of industrial and mobile equipment requirements.<\/p>\n

\n
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Track Drive Series \u2014 Full Torque Range<\/h3>\n

EP-SE400T1 (1,300 N\u00b7m) \u00b7 EP-SE401T1 (2,000 N\u00b7m) \u00b7 EP-SE402T2 (5,000 N\u00b7m, this model) \u00b7 Higher-torque multi-stage models to 450,000 N\u00b7m. Contact Korea Ever-Power for the full series selection guide.<\/p>\n<\/div>\n

\n

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

P0 \u22641 arcmin to P2 grade for servo motors, CNC rotary axes, robot joints, and semiconductor handling. EP-TM, EP-TNF, EP-TEG, EP-TMR series \u2014 the opposite end of the Korea Ever-Power roda gigi planet<\/a> range from the track drive series.<\/p>\n

\"high<\/p>\n<\/div>\n

\n

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

Winch drive planetary gearboxes for crane hoists and marine deck winches; slewing drives for excavator swing and wind turbine yaw; wheel drive units for aerial work platforms and wheeled heavy vehicles. Contact Korea Ever-Power for the complete catalogue.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Technical FAQ<\/h2>\n
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Q<\/span>Does the standard configuration truly have no parking brake? Is this a safety concern?<\/h3>\n

The standard EP-SE402T2 does not include an integrated spring-applied parking brake. This is not an oversight \u2014 it is a deliberate design for the 12\u201325 tonne machine class, where parking hold is typically managed by the hydraulic system. The most common method is an overcenter (counterbalance) valve in the travel motor circuit, which creates a back-pressure requirement before the motor can rotate in either direction, preventing free-wheeling under machine weight even with the pump in neutral. A motor case drain check valve provides additional security. For applications requiring positive mechanical parking hold independent of the hydraulic circuit \u2014 particularly on steep slopes in forestry or mining \u2014 Korea Ever-Power offers an integrated spring-applied brake on custom order. Provide machine gross weight and steepest parking angle for brake torque specification.<\/p>\n<\/div>\n

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Q<\/span>Why is the max input speed 3,500 rpm rather than 1,000 rpm like the single-stage models?<\/h3>\n

In a single-stage track drive (EP-SE400T1 \/ SE401T1), the motor input goes directly to the single planet set and then to the ring gear output \u2014 with only one reduction, the input speed limit is relatively low (1,000 rpm) to keep output speed in the correct range for machine travel. In the EP-SE402T2 two-stage design, the first stage performs an initial speed reduction before the power reaches the second stage. A 3,500 rpm motor input is reduced by the first stage ratio before it enters the second planet set \u2014 the second stage sees a much lower speed than 3,500 rpm. This allows the use of high-speed axial piston motors (typically 2,000\u20133,500 rpm rated) which have higher power density in a smaller displacement than the low-speed orbit motors used with single-stage drives.<\/p>\n<\/div>\n

\n

Q<\/span>Can EP-SE402T2 directly replace existing Rexroth GFT or Bonfiglioli 700C drives?<\/h3>\n

For units in the 5,000 N\u00b7m double-stage torque class with matching ratio, the mounting flange bolt circle, spindle bore, drum OD, and hydraulic port positions match the equivalent Rexroth GFT and Bonfiglioli 700C models. Korea Ever-Power provides an explicit dimensional cross-reference against the specific legacy model number before order \u2014 if any dimension differs, it is identified before the machine comes off line. The ratio must also be confirmed to match, as both the legacy drive and EP-SE402T2 offer multiple ratio options within the same housing class. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.<\/em><\/p>\n<\/div>\n

\n

Q<\/span>Why is efficiency rated at >94% rather than the >96% of the single-stage models?<\/h3>\n

Each planetary gear stage has a mesh efficiency of approximately 97% for helical and spur planetary gearing under rated load. With two stages in series, the combined efficiency is approximately 0.97 \u00d7 0.97 = 0.94 \u2014 hence >94%. This is not a quality deficiency; it is a fundamental result of having two gear mesh events in the power path versus one. The 3\u20134% efficiency difference between single and double stage corresponds to about 2\u20134 kW of heat generated per 100 kW transmitted \u2014 well within the thermal capacity of the nodular iron housing and oil bath lubrication system at rated duty.<\/p>\n<\/div>\n

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Q<\/span>What oil volume and service schedule applies to EP-SE402T2?<\/h3>\n

Use API GL-5 gear oil: ISO VG 150 for ambient below +15\u00b0C; ISO VG 220 for ambient above +15\u00b0C. The double-stage housing contains a larger oil volume than single-stage models \u2014 typically 2.5\u20133.5 litres depending on configuration (confirm on Korea Ever-Power dimensional drawing). First oil change at 150 operating hours to remove run-in particles from two stages of gear mesh. Subsequent changes every 1,000 hours or annually, whichever is sooner. The larger oil volume provides better thermal buffer at this torque class.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Specify EP-SE402T2 \u2014 Ratio Selection and Dimensional Confirmation Before Order<\/h2>\n

Provide target travel speed, machine weight, hydraulic motor specification, and parking hold requirement. Korea Ever-Power returns ratio selection, dimensional cross-reference, and lead time \u2014 same-day for urgent applications.<\/p>\n

5,000 N\u00b7m \u00b7 i=12.4\u201337.1 (selectable) \u00b7 3,500 rpm input \u00b7 \u221225\u00b0C to +90\u00b0C \u00b7 Nodular cast iron<\/p>\n

Browse All Planetary Gearboxes \u2192
\n<\/a><\/div>\n<\/section>\n

 <\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

\n
\u2605 Two Planetary Stages, One Critical Difference: Selectable Ratio \u2014 Not Fixed<\/div>\n

Every single-stage SE model in this series \u2014 the EP-SE400T1<\/a> and EP-SE401T1 \u2014 has a fixed reduction ratio determined at manufacture. You specify the model; the ratio is what it is. The EP-SE402T2 double-stage design breaks from this: the ratio is selectable across i=12.4 to 37.1 at order time, covering a 3\u00d7 speed range within the same housing envelope. A machine needing 4.0 km\/h travel speed uses a different ratio than one needing 1.5 km\/h \u2014 both fit the same gearbox family, the same sprocket interface, the same chassis mounting.<\/p>\n

The 3,500 rpm input rating (versus 1,000 rpm in the single-stage models) is not incidental \u2014 it reflects the first planetary stage already performing a primary speed reduction before the motor speed reaches the second stage gear set. This allows the use of high-speed axial piston motors, which are more compact and have higher power density than the low-speed orbit motors typically paired with single-stage drives.<\/p>\n<\/div>","protected":false},"featured_media":821,"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-815","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\/id\/wp-json\/wp\/v2\/product\/815","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/comments?post=815"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/media\/821"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/media?parent=815"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/product_brand?post=815"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/product_cat?post=815"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/product_tag?post=815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}