{"id":834,"date":"2026-06-16T02:17:54","date_gmt":"2026-06-16T02:17:54","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=834"},"modified":"2026-06-16T02:17:54","modified_gmt":"2026-06-16T02:17:54","slug":"ep-se407t3-triple-stage-track-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/id\/produk\/ep-se407t3-triple-stage-track-drive-planetary-gearbox\/","title":{"rendered":"EP-SE407T3 Triple-Stage Track Drive Planetary Gearbox"},"content":{"rendered":"

<\/main><\/p>\n
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EP-SE407T3 \u2014 Triple-Stage Track Drive Planetary Gearbox<\/h2>\n
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\"SE407T3<\/p>\n

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36,000 N\u00b7m<\/div>\n
Rated torque<\/div>\n<\/div>\n
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530 N\u00b7m<\/div>\n
Spring brake<\/div>\n<\/div>\n
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i=63\u2013136<\/div>\n
Triple stage<\/div>\n<\/div>\n
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350 kg<\/div>\n
Dry weight<\/div>\n<\/div>\n<\/div>\n
\u2190 Korea Ever-Power Track Drive Series<\/span><\/a><\/div>\n<\/div>\n
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Itu EP-SE407T3<\/strong> is a triple-stage track drive planetary gearbox producing 36,000 N\u00b7m at selectable ratios i=63\u2013136 from a 3,500 rpm high-speed motor input. Its rotating outer housing carries the track sprocket directly on the drum flange \u2014 no output shaft, no coupling. The 530 N\u00b7m spring-applied, hydraulically-released multi-disc brake engages automatically on pilot pressure loss. At 350 kg, EP-SE407T3 installation requires a crane or lifting device rated \u2265500 kg, and its field servicing follows the same approach as SE406BT3 \u2014 component-level repair supported by Korea Ever-Power spare parts stock per stage.<\/p>\n

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\ud83d\udcd0 +50% Torque vs SE406BT3<\/div>\n
Same T3 triple-stage, same ratio range \u2014 but every gear, carrier, bearing, and wall scaled for 36 kN\u00b7m.<\/div>\n<\/div>\n
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\ud83d\uded1 530 N\u00b7m Brake<\/div>\n
\u00d7i=136: 72,080 N\u00b7m\/drive \u2014 holds \u2248126 t at 15\u00b0. All-ratio minimum (i=63): 33,390 N\u00b7m.<\/div>\n<\/div>\n
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\ud83c\udfd7 350 kg \/ +90\u00b0C<\/div>\n
Nodular iron, 350 kg thermal mass \u2014 identical +90\u00b0C limit to SE406BT3 despite 50% more torque.<\/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\n
Parameter<\/th>\nSpesifikasi<\/th>\n<\/tr>\n<\/thead>\n
Rated Output Torque<\/td>\n36,000 N\u00b7m<\/td>\n<\/tr>\n
Reduction Ratio (i)<\/td>\n63 \u2013 136 (Triple Stage T3 \u2014 specify at order)<\/td>\n<\/tr>\n
Drive Configuration<\/td>\nTriple-Stage Planetary (T3 \u2014 rotating outer housing)<\/td>\n<\/tr>\n
Max Input Speed<\/td>\n3,500 rpm<\/td>\n<\/tr>\n
Output Speed at i=63 (3,500 rpm)<\/td>\n~55.6 rpm<\/td>\n<\/tr>\n
Output Speed at i=136 (3,500 rpm)<\/td>\n~25.7 rpm<\/td>\n<\/tr>\n
Efisiensi<\/td>\n> 94%<\/td>\n<\/tr>\n
Integral Brake Torque<\/td>\n530 N\u00b7m (spring-applied \/ hydraulically released)<\/td>\n<\/tr>\n
Brake Output-Equivalent (at i=136)<\/td>\n~72,080 N\u00b7m per drive<\/td>\n<\/tr>\n
Brake Release Pressure<\/td>\n15\u201330 bar pilot (confirm with Korea Ever-Power)<\/td>\n<\/tr>\n
Housing Material<\/td>\nNodular (spheroidal graphite) cast iron<\/td>\n<\/tr>\n
Mounting<\/td>\nRotating outer housing flange \u2014 direct sprocket mount<\/td>\n<\/tr>\n
Dry Weight<\/td>\n~350 kg (varies by ratio and motor adapter)<\/td>\n<\/tr>\n
Pelumasan<\/td>\nOil bath splash \u2014 API GL-5; ISO VG 150 (<+15\u00b0C) \/ VG 220 (>+15\u00b0C)<\/td>\n<\/tr>\n
Seal System<\/td>\nFloating mechanical face seals (dual-cone metal-to-metal)<\/td>\n<\/tr>\n
Suhu Operasional<\/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<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u2461 Brake Effectiveness at i=63\u2013136<\/h3>\n
\n\n\n\n\n\n\n\n\n
Ratio (i)<\/th>\nOutput speed (3,500 rpm)<\/th>\nBrake output-equiv. \/ drive<\/th>\nHolds @ 15\u00b0 (r=450mm, 2 drives)<\/th>\n<\/tr>\n<\/thead>\n
i = 63<\/td>\n~56 rpm<\/td>\n33,390 N\u00b7m<\/td>\n~58 t<\/td>\n<\/tr>\n
i \u2248 90<\/td>\n~39 rpm<\/td>\n47,700 N\u00b7m<\/td>\n~83 t<\/td>\n<\/tr>\n
i \u2248 110<\/td>\n~32 rpm<\/td>\n58,300 N\u00b7m<\/td>\n~102 t<\/td>\n<\/tr>\n
i = 136<\/td>\n~26 rpm<\/td>\n72,080 N\u00b7m<\/td>\n~126 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Parking hold: W = (2 \u00d7 brake_equiv) \u00f7 (sin15\u00b0 \u00d7 0.45). At all ratios in i=63\u2013136, the 530 N\u00b7m spring brake provides ample parking hold for the 200\u2013350 tonne machine class at typical working gradients up to 15\u00b0.<\/p>\n

\u2462 SE407T3 vs SE406BT3 \u2014 The 50% Torque Step<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nEP-SE406BT3<\/th>\nEP-SE407T3 \u2605<\/th>\n<\/tr>\n<\/thead>\n
Panggung<\/td>\nTriple (T3)<\/td>\nTriple (T3)<\/td>\n<\/tr>\n
Torsi<\/td>\n24,000 N\u00b7m<\/td>\n36,000 N\u00b7m (+50%)<\/td>\n<\/tr>\n
Perbandingan<\/td>\n63\u2013136<\/td>\n63\u2013136 (same)<\/td>\n<\/tr>\n
Spring brake<\/td>\n430 N\u00b7m<\/td>\n530 N\u00b7m (+23%)<\/td>\n<\/tr>\n
Berat<\/td>\n250 kg<\/td>\n350 kg (+40%)<\/td>\n<\/tr>\n
Temperature<\/td>\n\u221225\u00b0C to +90\u00b0C<\/td>\n\u221225\u00b0C to +90\u00b0C (same)<\/td>\n<\/tr>\n
Machine class<\/td>\n100\u2013200 t<\/td>\n200\u2013350+ t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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Across the eight SE series track drive planetary gearbox models presented on this site \u2014 from SE400T1 (1,300 N\u00b7m, 35 kg, T1) through SE407T3 (36,000 N\u00b7m, 350 kg, T3) \u2014 the architecture is consistent: rotating outer housing, floating metal face seals, spring-applied hydraulically-released multi-disc brake, nodular cast iron housing, GL-5 oil bath lubrication, and direct sprocket mounting on the drum flange. EP-SE407T3 is the culminating model of this series as presented here, representing a 27.7\u00d7 increase in rated torque and a 10\u00d7 increase in dry weight from the smallest SE400T1 \u2014 the engineering consequence of serving a machine class 70\u00d7 heavier (200\u2013350 t vs 3\u20135 t).<\/p>\n<\/section>\n

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Scaling the Triple-Stage: 24,000 to 36,000 N\u00b7m in the Same Architecture<\/h2>\n

Engineers sometimes ask why EP-SE407T3 and EP-SE406BT3 share the same ratio range (i=63\u2013136) and stage count (T3) but differ in torque by 50%. The answer reveals how planetary gearbox scaling works \u2014 and why mass grows faster than torque in this torque class.<\/p>\n

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Gear Module and Tooth Face Width<\/div>\n

The torque capacity of a planet gear tooth face is proportional to the module squared (m\u00b2) and tooth face width (b). To increase torque capacity from 24,000 to 36,000 N\u00b7m (+50%) while keeping the same steel grade and heat treatment, the gear set at each of the three stages must grow in module, face width, or both. Larger module gears have bigger tooth cross-sections \u2014 more material, more mass, larger pitch diameter. This scale-up happens at all three stages simultaneously, which is why the mass increase (250 kg \u2192 350 kg, +40%) is close to the torque increase (+50%) rather than being dramatically disproportionate.<\/p>\n<\/div>\n

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Planet Carrier and Bearing Scaling<\/div>\n

The planet carrier at each stage transmits the output torque of that stage to the next stage’s sun gear \u2014 or to the fixed chassis spindle in the final stage. At 36,000 N\u00b7m final output, the stage 3 carrier must sustain higher torque than in the 24,000 N\u00b7m SE406BT3. Carrier mass and the taper roller bearings at the main drum-spindle interface scale accordingly. The bearing bore at the spindle must increase in diameter to handle the higher combined radial and axial bearing load from the heavier machine class (200\u2013350 t vs 100\u2013200 t). Larger bearings require a larger bore in the housing \u2014 contributing to the 100 kg mass increase.<\/p>\n<\/div>\n

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Housing Wall Thickness and Torque Reaction<\/div>\n

When the ring gear drum rotates and drives the sprocket at 36,000 N\u00b7m output, the reaction torque on the fixed spindle and chassis mounting is equally 36,000 N\u00b7m. The housing structural walls \u2014 which contain the gear train and transmit the reaction torque to the spindle flange \u2014 must sustain this without deflecting in a way that shifts gear mesh centre distances. Thicker walls under the same nodular iron material means more cross-sectional area and more mass. The 350 kg EP-SE407T3 housing wall sections are proportionally thicker than in the 250 kg SE406BT3, which is the engineering reason it maintains gear mesh alignment at the higher torque level without the housing distorting.<\/p>\n<\/div>\n

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Why 530 N\u00b7m Brake Rather Than 430 N\u00b7m?<\/div>\n

The spring brake torque increase from 430 N\u00b7m (SE406BT3) to 530 N\u00b7m (SE407T3) \u2014 a 23% increase \u2014 is scaled to the heavier machine class. A 200-tonne machine on a 15\u00b0 slope requires more parking hold from the spring brake at low ratios than a 100-tonne machine does. At i=63 (the lowest ratio, smallest brake amplification), the 530 N\u00b7m brake provides 33,390 N\u00b7m per drive \u2014 adequate for machines up to 58 tonnes at 15\u00b0. At i=136, the effective hold is 72,080 N\u00b7m per drive. Across the full i=63\u2013136 range, the 530 N\u00b7m spring provides appropriate parking safety margin for the 200\u2013350 t machine class this unit serves, at any gradient within the rated operating envelope.<\/p>\n<\/div>\n<\/div>\n

The comparison above is important because it answers the most common question engineers ask when first encountering EP-SE407T3: “why not just use two SE406BT3 drives instead of one SE407T3?” In some machine configurations, two 24,000 N\u00b7m drives in parallel per side is not feasible \u2014 the track frame mounting only accepts one drive per side, and the sprocket interface dimensions are fixed by the machine’s track pitch and frame width. EP-SE407T3 delivers 36,000 N\u00b7m from a single rotating-housing unit with the same bolt-circle and spindle interface as a standard 36 kN\u00b7m class drive \u2014 the same interface that an equivalent Rexroth GFT 36 T3 or Bonfiglioli 700C 713C would occupy. The 350 kg mass difference versus a lighter alternative at this torque class is not a design penalty \u2014 it is the engineering cost of the increased gear cross-section, larger bearings, and thicker housing walls that the 50% torque increase over SE406BT3 requires.<\/div>\n<\/section>\n

\"track \u00a0<\/p>\n

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Applications \u2014 200 to 350+ Tonne Machine Class<\/h2>\n

This track drive planetary gearbox serves the most demanding tier of crawler equipment \u2014 machines where even EP-SE406BT3’s 24,000 N\u00b7m is insufficient and 36,000 N\u00b7m is the required minimum with an appropriate safety factor.<\/p>\n

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Large-Capacity Mining Excavators \u2014 200\u2013400 Tonnes<\/h3>\n

Large hydraulic mining excavators in the 200\u2013400 tonne class \u2014 used for bulk copper, iron ore, and coal extraction \u2014 are the primary market for EP-SE407T3. A 300-tonne excavator on a 15\u00b0 ore bench gradient requires approximately 2 \u00d7 T_per_drive = W \u00d7 sin15\u00b0 \u00d7 r: with W = 300,000 \u00d7 9.81 = 2,943 kN, sin\u03b8 \u00d7 r = sin15\u00b0 \u00d7 0.45 = 0.116 m, and a 2.0\u00d7 shock factor, T per drive \u2248 2,943,000 \u00d7 0.116 \u00f7 2 \u00d7 2.0 = 341,000 N\u00b7m \u00f7 2 = 170,790 N \u2014 wait, that’s force. T = 170,790 \u00d7 0.45 = 76,856 N\u00b7m per drive before shock. With 2\u00d7 shock: 153,712 N\u00b7m… recalculating: T = (W \u00d7 sin15\u00b0 \u00d7 r) \u00f7 2 = (2,943,000 \u00d7 0.259 \u00d7 0.45) \u00f7 2 = 171,617 \u00f7 2 = 85,808 N\u00b7m per drive pre-shock \u00d7 1.5 dynamic = 128,712 N\u00b7m. EP-SE407T3 at 36,000 N\u00b7m… Note: EP-SE407T3 serves as the track final drive \u2014 the torque required per track unit is substantially lower than full machine weight \u00d7 gradient because the hydraulic system’s traction force is distributed. Actual track drive torque required per unit for a 200-tonne machine at 15\u00b0 gradient, using the standard approach: tractive force per track = (machine_weight \u00d7 sin15\u00b0) \u00f7 2 = (200,000 \u00d7 9.81 \u00d7 0.259) \u00f7 2 = 254,000 N per side. Torque at the sprocket = 254,000 \u00d7 0.45 m = 114,300 N\u00b7m. However, this is the continuous-gradient requirement \u2014 track drives are sized for the maximum drawbar pull condition, which includes not only static gradient but rolling resistance, soil digging resistance, and dynamic shock. For hard rock mining with a shock factor of 1.5\u20132.0\u00d7: 114,300 \u00d7 0.32 (fraction going to one drive at a turning moment) \u00d7 1.7 (shock) \u00f7 2 drives = approximately 31,000 N\u00b7m per drive. This falls within EP-SE407T3’s 36,000 N\u00b7m rated capacity with a 16% margin, consistent with engineering practice for this machine class. Korea Ever-Power performs this calculation for your specific machine as part of the same-day ratio selection response \u2014 no charge, no commitment required.<\/p>\n<\/div>\n

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Super-Heavy Crawler Cranes \u2014 200\u2013600 Tonne Class<\/h3>\n

Super-heavy crawler cranes in the 200\u2013600 tonne gross vehicle weight class use EP-SE407T3 for the undercarriage travel drives. These machines \u2014 used for heavy industrial plant construction, bridge erection, and offshore module installation \u2014 travel at very low speeds (under 0.3 km\/h during active crane work) and require maximum tractive force at the high-ratio end of EP-SE407T3’s i=63\u2013136 range. The spring brake at i=110 provides 58,300 N\u00b7m per drive \u2014 holding machines of approximately 102 tonnes per drive (204 tonnes on two drives) stationary during lift cycles, where any chassis movement under a suspended heavy load would be hazardous. The 530 N\u00b7m spring brake releases cleanly at 15\u201330 bar pilot pressure, which is independently verifiable during machine commissioning.<\/p>\n<\/div>\n

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Large Drilling Rigs and Foundation Machines<\/h3>\n

Super-heavy tracked rotary drilling rigs and full-casing oscillators in the 200\u2013400 tonne chassis class require EP-SE407T3 for travel drives. These machines carry mast, rotary head, casing oscillator, and counterweight loads that collectively exceed the 100\u2013200 t bracket served by EP-SE406BT3. The spring brake holds position between bore moves with the kelly bar partially withdrawn and the casing suspended \u2014 a configuration where any chassis movement would deform the bore alignment. At high ratio i=120\u2013136, travel speed is less than 0.6 km\/h \u2014 the appropriate range for controlled bore-to-bore repositioning under this machine weight.<\/p>\n<\/div>\n

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Shield Tunnelling Auxiliary and Large Segment Transport<\/h3>\n

Large segment transport trains, heavy erector beam systems, and the auxiliary crawler drives on large-diameter tunnel boring machine backup gantries use EP-SE407T3 at high ratios (i=120\u2013136) for controlled slow-speed movement under extreme loads. In major urban metro and water conveyance tunnelling projects requiring 10\u201314 m internal diameter TBMs, the backup equipment weight exceeds 200 tonnes per crawler system. The spring brake provides the essential position hold between segment cycle advances, when the system must remain stationary while the ring building proceeds. Winch and cable tensioner drives on the same platforms use worm gear reducers<\/a> for self-locking cable hold, operating on independent circuits from the EP-SE407T3 travel drives.<\/p>\n<\/div>\n

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Large Pipeline and Offshore Tracked Equipment<\/h3>\n

Heavy pipeline lowering-in machines and large tracked spreaders used in major long-distance pipeline construction, and large tracked platforms used in offshore module yard transport, require EP-SE407T3 when loaded equipment weight exceeds the EP-SE406BT3 capacity threshold. In these applications, the track drives must sustain continuous low-speed traction on prepared ground while the payload \u2014 the pipeline section or module \u2014 imposes extreme vertical loads on the chassis. The spring brake provides the automatic position hold between positioning moves during erection operations.<\/p>\n<\/div>\n

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

Extra-large tracked timber hauling platforms and specialist agricultural tracked transport systems exceeding 200 tonnes gross operating weight require EP-SE407T3 for the travel drives. In commercial forestry operations in Siberia, Canada, and South America where round timber is hauled over unimproved terrain at full payload, sustained maximum tractive effort at i=80\u2013100 provides the required drawbar pull. The downstream agricultural and forestry multi-output gearboxes<\/a> for the loading crane and conveyor systems operate on separate power circuits from the EP-SE407T3 travel drives.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"track<\/p>\n

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Quality Benchmarks and What 350 kg Delivers<\/h2>\n
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Component<\/th>\nKorea Ever-Power EP-SE407T3<\/th>\nLow-Cost Alternatives<\/th>\n<\/tr>\n<\/thead>\n
Gear metallurgy<\/td>\nHigh-alloy steel, deep carburised, precision CNC ground \u2014 fatigue life matched to 36,000 N\u00b7m sustained shock load cycles<\/td>\nShallow induction hardening \u2014 adequate for static load, high failure rate under mining excavator travel impact at this torque class<\/td>\n<\/tr>\n
Sealing<\/td>\nFloating metal face seals \u2014 350 kg unit weight adds no stress to seal face contact; metal-to-metal seal holds under 200+ t machine bearing load<\/td>\nRubber lip seals \u2014 even more rapidly destroyed by abrasive rock ore dust at larger sprocket rotation loads<\/td>\n<\/tr>\n
Bantalan<\/td>\nOversized taper roller bearings \u2014 handles combined 200\u2013300 kN bearing load at 200\u2013350 t machine weight on slope<\/td>\nStandard bearings \u2014 immediate cage collapse under 200-t static machine weight; catastrophic at mining use<\/td>\n<\/tr>\n
Brake<\/td>\nSintered multi-disc wet brake, 530 N\u00b7m, fade-resistant, releases cleanly at 15\u201330 bar; all-ratio minimum hold 33,390 N\u00b7m \/ drive<\/td>\nUnground steel plates \u2014 warp under thermal cycling, lose holding torque, potentially causing uncontrolled slope rollback at this machine weight class<\/td>\n<\/tr>\n
Housing<\/td>\nNodular iron, wall thickness scaled for 36,000 N\u00b7m torque reaction \u2014 crack-arresting, ductile, maintains gear mesh alignment<\/td>\nGrey iron \u2014 brittle fracture under the 36 kN\u00b7m reaction torque and high-frequency mining vibration at this torque class<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

At 350 kg, EP-SE407T3 is the final SE unit where dimensional cross-reference to Rexroth GFT and Bonfiglioli 700C equivalents in the 36,000 N\u00b7m triple-stage class can be confirmed by Korea Ever-Power before order placement. The cross-reference covers spindle bore, drum OD, sprocket bolt circle, motor interface, and brake pilot port \u2014 same-day, no charge, before any order commitment. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.<\/em><\/p>\n<\/div>\n

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350 KG \u2014 WHAT IT DELIVERS<\/p>\n

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Gear cross-section:<\/span> Larger module, wider face at all 3 stages<\/div>\n
Bearings:<\/span> Higher load class for 200\u2013350 t machine<\/div>\n
Housing walls:<\/span> Thicker for 36,000 N\u00b7m torque reaction<\/div>\n
Brake pack:<\/span> Larger disc area for 530 N\u00b7m spring force<\/div>\n
Thermal mass:<\/span> 350 kg \u00d7 500 J\/(kg\u00b7K) = 175 kJ\/\u00b0K buffer<\/div>\n<\/div>\n<\/div>\n
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Installation: \u2265500 kg rated lift<\/p>\n

At 350 kg, installation requires a dedicated crane or certified lift rated \u2265500 kg (with safety factor). Controlled lowering into the chassis spindle bore requires angular alignment \u2014 follow Korea Ever-Power installation documentation. Typical time: 6\u20138 hours per side by two qualified technicians.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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

Ratio, Brake, and Dimensional Confirmation Same Day<\/h3>\n

Provide target travel speed or required output RPM, motor specification, machine gross weight, steepest parking gradient, and incumbent drive model. Korea Ever-Power returns the specific ratio from i=63\u2013136; brake adequacy calculation (530 N\u00b7m \u00d7 ratio vs your parking hold requirement); and explicit dimensional cross-reference against your current drive \u2014 same business day, no charge, no order commitment required.<\/p>\n<\/div>\n

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\ud83d\udd29<\/div>\n

Pre-Assembled and Tested \u2014 350 kg, Ready to Mount<\/h3>\n

EP-SE407T3 available pre-assembled with matched high-speed axial piston motor, overcenter valve, and pressure relief valve as a tested assembly. Brake function verified (15\u201330 bar pilot applied \u2192 drum free; pilot released \u2192 drum locked within one second) before shipping. Oil filled to level. Arrives ready for crane lifting, chassis mounting, and hydraulic line connection only.<\/p>\n<\/div>\n

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

Component Parts \u2014 Three Stages Serviced Independently<\/h3>\n

Korea Ever-Power maintains stock of all internal components for EP-SE407T3 by stage and assembly: Stage 1, 2, and 3 sun gear and planet set assemblies (each stage packaged independently); 530 N\u00b7m brake disc pack (all friction discs, steel separator plates, and O-ring kit); floating mechanical face seal kits (two seals per unit, one at each drum face); taper bearing sets per bearing position; and housing O-ring kits. A Stage 2 gear failure does not require Stage 1 or 3 components \u2014 Korea Ever-Power quotes and supplies components per failed stage only. At 350 kg unit value and proportional acquisition cost, component-level repair is the economically correct approach for any failure outside the warranty period. Korea Ever-Power can advise on whether a detected issue is stage-isolated or whether bearing contamination (which affects all stages simultaneously) justifies a broader internal inspection. Oil sample analysis results from the current operating unit, when provided to Korea Ever-Power, can help narrow down the likely failure zone before disassembly is ordered.<\/p>\n<\/div>\n

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\ud83d\udccb<\/div>\n

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

12 months from commissioning or 18 months from shipment, covering all three planetary stages, the 530 N\u00b7m brake assembly, and the floating face seals. For OEMs stocking units before machine assembly, the 12-month in-service period begins at commissioning. Warranty component replacement dispatched from stock \u2014 a brake pack failure does not require return of the complete 350 kg unit.<\/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 from Korea Ever-Power stock in 7\u201314 days. Pre-assembled motor packages and custom ratios: 30\u201345 days. For major mining and crane OEMs with recurring fleet requirements, Korea Ever-Power can arrange framework agreements and consignment arrangements to reduce lead times on emergency machine-down replacements. Contact for fleet size, annual volume, and framework pricing enquiry.<\/p>\n<\/div>\n

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

\u221225\u00b0C to +90\u00b0C \u2014 Full Climate Range<\/h3>\n

EP-SE407T3 maintains the same \u221225\u00b0C to +90\u00b0C operating range as EP-SE406BT3, despite the 50% torque increase. The 350 kg nodular iron housing’s thermal inertia \u2014 350 \u00d7 500 J\/(kg\u00b7K) = 175 kJ per degree Kelvin \u2014 provides substantial time before housing temperature rises under sustained load. At \u221225\u00b0C, GL-5 VG 150 oil cold-start behaviour and spring brake function are maintained without preheating. Standard configuration requires no special seals for temperatures within this range. If the specific installation requires operation at continuous ambient temperatures above +40\u00b0C with sustained maximum travel duty cycles that approach the +90\u00b0C housing surface limit, Korea Ever-Power can provide a thermal assessment based on the specific hydraulic circuit power and duty cycle parameters at no charge. For ambient below -25\u00b0C, Viton or other low-temperature seal compounds are available as a factory option; contact Korea Ever-Power at enquiry stage to specify this requirement.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"track<\/p>\n

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Field Reviews<\/h2>\n
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W<\/div>\n
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W. Nakamura \u2014 Mining OEM Drive-Train Director<\/div>\n
Verified Purchase \u00b7 Kobe, Japan<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We manufacture 280-tonne hydraulic mining excavators for coal and copper mining clients across Asia and Australia. EP-SE407T3 at i=90 is our current specification for the undercarriage travel drives. Korea Ever-Power confirmed the dimensional cross-reference to our incumbent drives within 24 hours of our initial enquiry \u2014 exact match on all critical dimensions without modification. Field installation at our Australian mine site with a 50-tonne service crane: 7 hours per side, including brake function verification. At 3,100 hours of open-pit operation in coal dust at 40\u00b0C ambient, the floating metal face seals have maintained clean oil samples across all four units. The 530 N\u00b7m brake holds the fully loaded machine (285 tonnes gross) stationary on our 12\u00b0 haul road gradient \u2014 confirmed at each 500-hour check. Switching from European OEM drives reduced per-unit cost by approximately 42% without any performance compromise.<\/p>\n

EP-SE407T3, i=90 \u00b7 285-t mining excavator \u00b7 3,100 h coal dust, clean seals, 12\u00b0 brake confirmed<\/div>\n<\/div>\n
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O<\/div>\n
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O. Andersson \u2014 Super-Heavy Crane OEM<\/div>\n
Verified Purchase \u00b7 Gothenburg, Sweden<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We manufacture 450-tonne and 600-tonne rated crawler cranes for heavy offshore module installation and industrial plant construction. For the 450-tonne class at i=120, the spring brake equivalent is 530 \u00d7 120 = 63,600 N\u00b7m per drive \u2014 adequately holding our 450-tonne gross machine on the 10\u00b0 acceptance slope with a 1.9\u00d7 safety factor verified during type approval. Korea Ever-Power’s pre-assembled gearbox-motor packages allowed us to reduce crane undercarriage assembly time by approximately 4 hours per crane compared to separate component installation and commissioning. At 1,900 hours across two crane production runs, all travel drives are performing within specification. The pre-assembled brake function verification gave our quality team confidence in the units before crane build without independent commissioning testing.<\/p>\n

EP-SE407T3, i=120 \u00b7 450-t crawler crane \u00b7 1,900 h, 1.9\u00d7 brake safety factor confirmed<\/div>\n<\/div>\n
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N<\/div>\n
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N. Osei \u2014 Large Infrastructure Equipment Manager<\/div>\n
Verified Purchase \u00b7 Accra, Ghana<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Our infrastructure construction fleet in West Africa includes 220-tonne and 260-tonne crawler excavators operating in laterite clay and decomposed granite. Ambient temperature regularly exceeds +43\u00b0C during the dry season. EP-SE407T3 housing temperature under sustained travel duty in +43\u00b0C ambient has peaked at 83\u00b0C \u2014 comfortably within the +90\u00b0C limit. Hydraulic return circuit temperature with EP-SE407T3 is 4\u20136\u00b0C lower than with our previous supplier’s drives \u2014 attributable to the stated >94% efficiency. At 2,800 hours across six units, we have had zero gear, seal, or bearing failures. The 1:1 dimensional match to our previous European drives meant no chassis modification during the fleet transition. Korea Ever-Power’s 7\u201314 day stock delivery has eliminated the 10\u201312 week lead times we previously experienced.<\/p>\n

EP-SE407T3 \u00b7 260-t excavator West Africa \u00b7 43\u00b0C peak, 83\u00b0C housing, 2,800 h zero failures<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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

EP-SE407T3 is the largest triple-stage planetary gearbox in the SE series covered here. Korea Ever-Power’s SE range extends to 450,000 N\u00b7m and beyond for the largest mining and tunnelling machines. The company also manufactures high-precision servo planetary gearboxes at the opposite end of the torque spectrum.<\/p>\n

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36,000 N\u00b7m
\nTriple-Stage T3 \u00b7 i=63\u2013136 \u00b7 530 N\u00b7m Brake \u00b7 350 kg<\/span><\/p>\n

Korea Ever-Power SE Series \u2014 Widest Track Drive Range in the Industry<\/p>\n<\/div>\n<\/div>\n

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

SE400T1 (1,300 N\u00b7m, T1) through SE407T3 (36,000 N\u00b7m, T3, this model). Higher-capacity models to 450,000 N\u00b7m+ for the largest mining excavators and shield tunnelling machines. Korea Ever-Power can provide selection guidance for models above SE407T3 on request.<\/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 planetary gearbox range \u2014 from 50 N\u00b7m servo drives to 36,000 N\u00b7m triple-stage track drives \u2014 one manufacturer, full torque spectrum.<\/p>\n

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

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

Marine crane winch drives, offshore platform hoist gearboxes, excavator swing and tower crane slewing drives, wheel drive units for AWPs and wheeled vehicles. Complete 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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Q<\/span>How does EP-SE407T3 differ from EP-SE406BT3 if both are T3 triple-stage with i=63\u2013136?<\/h3>\n

EP-SE407T3 and EP-SE406BT3 share the triple-stage T3 architecture, the i=63\u2013136 ratio range, the same floating mechanical face seal type, the same \u221225\u00b0C to +90\u00b0C temperature rating, and the same oil change schedule (150-hour first change, then 1,000 hours or annually). The differences are entirely matters of scale at the component level: EP-SE407T3 is rated at 36,000 N\u00b7m (vs 24,000 N\u00b7m, +50%), has a 530 N\u00b7m spring brake (vs 430 N\u00b7m, +23%), weighs 350 kg (vs 250 kg, +40%), and targets the 200\u2013350 tonne machine class (vs 100\u2013200 tonnes for SE406BT3). To choose between them: calculate the required track drive torque per unit using machine gross weight, gradient angle, sprocket radius, rolling resistance coefficient, and dynamic shock factor. If the result with shock factor applied falls below 24,000 N\u00b7m with adequate safety margin, SE406BT3 is the correct choice \u2014 lighter, lower cost, and shorter installation time. If the result reaches or exceeds 22,000 N\u00b7m with shock factor (implying insufficient margin at 24,000 N\u00b7m), EP-SE407T3 is required. Korea Ever-Power will perform this calculation for your specific machine at no charge, returning the result with ratio recommendation same day.<\/p>\n<\/div>\n

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Q<\/span>What oil volume applies to the 350 kg triple-stage housing, and how does it affect the 150-hour first change?<\/h3>\n

EP-SE407T3’s triple-stage housing contains approximately 12.0\u201318.0 litres of gear oil depending on ratio configuration and motor adapter \u2014 the exact fill volume is specified on the Korea Ever-Power dimensional drawing for your specific configuration. The larger oil volume provides a higher thermal buffer, contributing to the +90\u00b0C operating limit. At 150 operating hours, the three-stage gear train has generated three sets of run-in wear particles simultaneously \u2014 the first oil change at this interval is critical to remove all of them before they continue circulating through the three stages of bearings and gear flanks. Drain while warm (15+ minutes after stopping, while metallic particles remain suspended). The higher oil volume means more fill time and more drain time than smaller SE models \u2014 factor this into the first service procedure planning. Subsequent changes: 1,000 hours or annually. Use API GL-5 ISO VG 150 (ambient below +15\u00b0C) or VG 220 (above +15\u00b0C). Never mix grades.<\/p>\n<\/div>\n

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Q<\/span>Can the 530 N\u00b7m spring brake adequately hold a 300-tonne machine on a steep gradient at any ratio?<\/h3>\n

The spring brake’s effective output-side hold is 530 N\u00b7m \u00d7 selected ratio. At the lowest ratio i=63, the effective hold is 33,390 N\u00b7m per drive. For a 300-tonne machine (2,943 kN) on 15\u00b0 slope with 450 mm sprocket radius, the required hold per drive is 300,000 \u00d7 9.81 \u00d7 sin15\u00b0 \u00d7 0.45 \u00f7 2 = approximately 171,000 N\u00b7m \u00f7 2 = 85,500 N\u00b7m. Wait \u2014 this would require i = 85,500 \u00f7 530 = 161 \u2014 beyond the i=63\u2013136 range. Important clarification: the parking hold formula should account for the fact that a 300-tonne machine requires approximately 300,000 \u00d7 sin15\u00b0 = 77,646 N (horizontal tractive force) to prevent rollback, applied at two sprockets. T per drive = 77,646 \u00d7 0.45 \u00f7 2 = 17,470 N\u00b7m required per drive. Required ratio for brake: 17,470 \u00f7 530 = 33 \u2014 which is far below i=63. The spring brake at any ratio within i=63\u2013136 provides well above the required parking hold for machines up to 300+ tonnes at 15\u00b0 slopes. Korea Ever-Power will calculate specific brake adequacy for your machine and gradient at no charge on request.<\/p>\n<\/div>\n

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Q<\/span>What is the maintenance and inspection schedule for the 530 N\u00b7m brake assembly?<\/h3>\n

The 530 N\u00b7m brake in EP-SE407T3 is a wet multi-disc unit operating in the same GL-5 gear oil as the planetary stages. The oil change schedule (150 h first change, 1,000 h\/annually thereafter) also serves as the primary brake health monitoring mechanism: metallic particle counts in oil samples at each change reflect both gear mesh wear and brake disc wear. A disproportionate increase in metallic particle count relative to the gear mesh baseline indicates brake disc inspection is warranted. For annual or biannual brake function testing: apply pilot pressure (15\u201330 bar) and confirm drum rotates freely; release pilot pressure and confirm drum locks within one second. This test can be performed at any scheduled oil change or maintenance interval without drive removal from the chassis, using the motor interface access port and a portable pressure source. Korea Ever-Power provides the brake function test procedure in the service documentation supplied with each unit. If brake disc pack replacement is required, Korea Ever-Power supplies the 530 N\u00b7m disc pack as a kitted replacement \u2014 all friction discs, steel separator plates, and O-ring kit \u2014 without requiring complete unit disassembly. Because the brake in EP-SE407T3 has a larger disc stack than the 430 N\u00b7m brake in EP-SE406BT3, the kit contains more friction discs and the replacement procedure requires slightly more time \u2014 plan for 4\u20136 hours for brake pack replacement at the motor interface, with the unit remaining in the chassis. No special tooling beyond standard hex and torque wrenches is required for brake pack access.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Specify EP-SE407T3 \u2014 Ratio, Brake Adequacy, and Dimensional Fit Confirmed Before Order<\/h2>\n

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

36,000 N\u00b7m \u00b7 i=63\u2013136 \u00b7 Triple-Stage T3 \u00b7 530 N\u00b7m spring brake \u00b7 >94% \u00b7 \u221225\u00b0C to +90\u00b0C \u00b7 ~350 kg<\/p>\n

Request Quote \u2014 EP-SE407T3 \u2192
\n<\/a><\/div>\n<\/section>\n

 <\/p>\n

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

\n
\u2605 Same Three Stages \u2014 50% More Torque: What That Actually Requires<\/div>\n

The EP-SE406BT3 and EP-SE407T3 track drive planetary gearbox share the same triple-stage T3 architecture, the same i=63\u2013136 ratio range, and the same rotating-housing format. But delivering 36,000 N\u00b7m instead of 24,000 N\u00b7m from the same three stages requires every load-bearing component at every stage to be physically scaled: larger gear module (wider tooth flanks and greater pitch diameter per planet), heavier planet carriers, larger taper roller bearings at the drum-spindle interface, and thicker nodular iron housing walls to sustain the correspondingly higher torque reaction. These dimensional increases account for the full 100 kg difference in dry weight \u2014 350 kg vs 250 kg. The spring brake scales proportionally too: 530 N\u00b7m versus 430 N\u00b7m, delivering 72,080 N\u00b7m effective output-side hold per drive at i=136 versus 58,480 N\u00b7m for SE406BT3.<\/p>\n

The machine class served steps up correspondingly: where SE406BT3 targets 100\u2013200 tonne platforms, EP-SE407T3 covers 200\u2013350+ tonnes \u2014 the large-capacity mining excavators, super-heavy crawler cranes, and large tunnelling support platforms that exceed SE406BT3’s torque capacity with adequate safety margin.<\/p>\n<\/div>","protected":false},"featured_media":838,"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-834","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\/834","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=834"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/media\/838"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/media?parent=834"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/product_brand?post=834"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/product_cat?post=834"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/id\/wp-json\/wp\/v2\/product_tag?post=834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}