{"id":824,"date":"2026-06-16T01:12:20","date_gmt":"2026-06-16T01:12:20","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=824"},"modified":"2026-06-16T01:20:35","modified_gmt":"2026-06-16T01:20:35","slug":"ep-se406bt3-triple-stage-track-drive-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/zh\/product\/ep-se406bt3-triple-stage-track-drive-planetary-gearbox\/","title":{"rendered":"EP-SE406BT3 Triple-Stage Track Drive Planetary Gearbox"},"content":{"rendered":"

<\/main><\/p>\n
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EP-SE406BT3 \u2014 Triple-Stage Track Drive Planetary Gearbox<\/h2>\n
\n
\n

\"SE406BT3<\/p>\n

\n
\n
24,000 N\u00b7m<\/div>\n
Rated torque<\/div>\n<\/div>\n
\n
430 N\u00b7m<\/div>\n
Spring brake<\/div>\n<\/div>\n
\n
i=63\u2013136<\/div>\n
Triple stage<\/div>\n<\/div>\n
\n
250 kg<\/div>\n
Dry weight<\/div>\n<\/div>\n<\/div>\n
\u2190 Korea Ever-Power Track Drive Series<\/span><\/a><\/div>\n<\/div>\n
\n

\u8fd9 EP-SE406BT3<\/strong> is a triple-stage track drive planetary gearbox for super-heavy crawler undercarriages in the 100\u2013200 tonne machine class: large-capacity mining excavators, heavy foundation piling machines, super-heavy crawler cranes, and large tunnelling support platforms. At 250 kg, the nodular iron housing’s greater thermal mass supports a +90\u00b0C operating temperature limit \u2014 higher than the 185 kg EP-SE406AT’s +85\u00b0C limit, despite delivering 41% more torque. The 430 N\u00b7m spring brake acting through i=136 produces 58,480 N\u00b7m effective hold per drive \u2014 adequate parking security for machines up to approximately 115 tonnes on 15\u00b0 slopes.<\/p>\n

\n
\n
\ud83d\udd17 Three Stages (T3)<\/div>\n
Each stage at i^(1\/3)=4\u20135 \u2014 high-efficiency zone per stage. Combined: 24,000 N\u00b7m.<\/div>\n<\/div>\n
\n
\ud83d\uded1 430 N\u00b7m Brake<\/div>\n
\u00d7i=136: 58,480 N\u00b7m \/ drive. Holds \u2248115 t at 15\u00b0 from the spring alone.<\/div>\n<\/div>\n
\n
\ud83c\udf21 250 kg \/ +90\u00b0C<\/div>\n
Heavier housing = more thermal mass + more surface area. Upper limit 5\u00b0C higher than SE406AT.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\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
\u8303\u56f4<\/th>\n\u89c4\u683c<\/th>\n<\/tr>\n<\/thead>\n
\u989d\u5b9a\u8f93\u51fa\u626d\u77e9<\/td>\n24,000 N\u00b7m<\/td>\n<\/tr>\n
Reduction Ratio Range (i)<\/td>\n63 \u2013 136 (Triple Stage \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 input)<\/td>\n~55.6 rpm<\/td>\n<\/tr>\n
Output Speed (at i=136, 3,500 rpm input)<\/td>\n~25.7 rpm<\/td>\n<\/tr>\n
\u6548\u7387<\/td>\n> 94% (source-stated; optimised three-stage gear mesh)<\/td>\n<\/tr>\n
Integral Brake Torque<\/td>\n430 N\u00b7m (spring-applied \/ hydraulically released)<\/td>\n<\/tr>\n
Brake Output-Equivalent (at i=136)<\/td>\n~58,480 N\u00b7m per drive<\/td>\n<\/tr>\n
Brake Release Pressure (pilot)<\/td>\n15\u201330 bar (confirm with Korea Ever-Power)<\/td>\n<\/tr>\n
Housing Material<\/td>\nNodular (spheroidal graphite) cast iron<\/td>\n<\/tr>\n
Mounting Type<\/td>\nRotating outer housing flange \u2014 direct sprocket mount<\/td>\n<\/tr>\n
Approximate Dry Weight<\/td>\n~250 kg (varies by ratio and motor adapter)<\/td>\n<\/tr>\n
\u6da6\u6ed1<\/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
\u5de5\u4f5c\u6e29\u5ea6<\/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<\/tbody>\n<\/table>\n<\/div>\n

\u2461 Brake Effectiveness Across 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=400mm, 2 drives)<\/th>\n<\/tr>\n<\/thead>\n
i = 63<\/td>\n~56 rpm<\/td>\n27,090 N\u00b7m<\/td>\n~53 t<\/td>\n<\/tr>\n
i \u2248 90<\/td>\n~39 rpm<\/td>\n38,700 N\u00b7m<\/td>\n~76 t<\/td>\n<\/tr>\n
i \u2248 110<\/td>\n~32 rpm<\/td>\n47,300 N\u00b7m<\/td>\n~93 t<\/td>\n<\/tr>\n
i = 136<\/td>\n~26 rpm<\/td>\n58,480 N\u00b7m<\/td>\n~115 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Parking hold: W = (2 \u00d7 brake_equiv) \u00f7 (sin15\u00b0 \u00d7 0.40). Across all ratios in i=63\u2013136, the spring brake provides adequate parking hold for the 100\u2013200 t machine class at typical working gradients.<\/p>\n

\u2462 SE Series Complete Range<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n
\u6a21\u578b<\/th>\n\u9636\u6bb5<\/th>\n\u626d\u77e9<\/th>\n\u6bd4\u7387<\/th>\nBrake<\/th>\n\u91cd\u91cf<\/th>\nTemp.<\/th>\nClass<\/th>\n<\/tr>\n<\/thead>\n
SE400T1<\/td>\nT1<\/td>\n1,300<\/td>\n6.09<\/td>\n130<\/td>\n35 kg<\/td>\n+90\u00b0C<\/td>\n3\u20135 t<\/td>\n<\/tr>\n
SE401T1<\/td>\nT1<\/td>\n2,000<\/td>\n6.2<\/td>\n270<\/td>\n45 kg<\/td>\n+85\u00b0C<\/td>\n6\u201312 t<\/td>\n<\/tr>\n
SE402T2<\/td>\nT2<\/td>\n5,000<\/td>\n12.4\u201337.1<\/td>\n\u2014<\/td>\n75 kg<\/td>\n+90\u00b0C<\/td>\n12\u201325 t<\/td>\n<\/tr>\n
SE403T2<\/td>\nT2<\/td>\n7,000<\/td>\n15.4\u201340.0<\/td>\n270<\/td>\n85 kg<\/td>\n+90\u00b0C<\/td>\n25\u201340 t<\/td>\n<\/tr>\n
SE405.4T<\/td>\nMx<\/td>\n11,000<\/td>\n26\u201357<\/td>\n280<\/td>\n140 kg<\/td>\n+90\u00b0C<\/td>\n40\u201370 t<\/td>\n<\/tr>\n
SE406AT<\/td>\nMx<\/td>\n17,000<\/td>\n23\u2013220<\/td>\n430<\/td>\n185 kg<\/td>\n+85\u00b0C<\/td>\n60\u2013100+ t<\/td>\n<\/tr>\n
SE406BT3 \u2605<\/td>\nT3<\/td>\n24,000<\/td>\n63\u2013136<\/td>\n430<\/td>\n250 kg<\/td>\n+90\u00b0C<\/td>\n100\u2013200+ t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n
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The seven SE models summarised above represent the Korea Ever-Power SE track drive planetary gearbox series from 1,300 N\u00b7m to 24,000 N\u00b7m \u2014 an 18.5\u00d7 span of torque capacity within the same rotating-housing, spring-brake, floating-face-seal architecture. EP-SE406BT3 is the first and highest-capacity explicitly T3 (triple-stage) unit in the range covered here. Higher-capacity SE models beyond SE406BT3 are available for the largest mining and tunnelling machines \u2014 contact Korea Ever-Power for the extended capacity selection guide.<\/p>\n

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

<\/p>\n

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Three Torque Bridges \u2014 How Triple-Stage Epicyclic Reaches 24,000 N\u00b7m<\/h2>\n

In a single-stage track drive, one epicyclic set transforms motor input into sprocket output. In a triple-stage unit, three successive epicyclic sets each contribute a partial ratio \u2014 and each hands its output to the next stage as an intermediate input. Here is what each stage contributes in EP-SE406BT3, and why three stages rather than two reaches 24,000 N\u00b7m more efficiently:<\/p>\n

\n
\n
STAGE 1<\/div>\n
~4\u20135\u00d7<\/div>\n
3,500 rpm input
\n\u2192 ~700\u2013875 rpm
\nTorque \u00d74\u20135<\/div>\n<\/div>\n
\u2192<\/div>\n
\n
STAGE 2<\/div>\n
~4\u20135\u00d7<\/div>\n
~700\u2013875 rpm in
\n\u2192 ~140\u2013220 rpm
\nTorque \u00d74\u20135 again<\/div>\n<\/div>\n
\u2192<\/div>\n
\n
STAGE 3<\/div>\n
~4\u20135\u00d7<\/div>\n
~140\u2013220 rpm in
\n\u2192 26\u201356 rpm out
\n24,000 N\u00b7m \u2713<\/div>\n<\/div>\n<\/div>\n
\n
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Why not just use two larger stages?<\/div>\n

A two-stage unit reaching i=63\u2013136 would require individual stage ratios of approximately i^(1\/2) = 8\u201312 per stage. At these higher per-stage ratios, planetary gear efficiency begins to decline and planet gear tooth load increases. Three stages at i^(1\/3) = 4\u20135 per stage keep each stage in the high-efficiency planetary operating zone \u2014 which is why SE406BT3 achieves >94% despite three stages of reduction. The three-stage architecture is not less efficient \u2014 under the right conditions, it is more efficient than two large stages.<\/p>\n<\/div>\n

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How the planet carrier transfers between stages<\/div>\n

At the end of stage 1, the output element (the stage 1 planet carrier, rotating at reduced speed with amplified torque) drives the stage 2 sun gear. Stage 2’s carrier then drives stage 3’s sun gear in the same manner. The final stage 3 planet carrier is the fixed element (connected to the machine spindle), and the stage 3 ring gear \u2014 integral to the rotating outer housing drum \u2014 is the output. Three carriers act as torque bridges, each handing an amplified, slowed output to the next stage’s centre.<\/p>\n<\/div>\n

\n
Why i=63\u2013136 and not i=23\u2013220 like SE406AT?<\/div>\n

Three stages in this housing naturally produce ratios in the 63\u2013136 range from the optimal 4\u20135\u00d7 per stage configuration. Extending to i=220 would require a fourth stage or significantly higher per-stage ratios \u2014 neither of which fits this housing design without a complete redesign. More practically, the 100\u2013200 tonne machines SE406BT3 targets do not need i=23: their maximum travel speed at i=63 is already in the 1.5\u20132.5 km\/h range at 350 mm sprocket radius, which is appropriate for machines in this weight class.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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The triple-stage architecture of EP-SE406BT3 distinguishes it from every other SE model in this series. In a single-stage T1 unit like EP-SE400T1 or EP-SE401T1, the motor directly drives the sun gear of the one and only epicyclic set \u2014 there are no intermediate stages, no carriers acting as inter-stage power bridges, and the ratio is determined entirely by the single set’s tooth count ratio. In a double-stage T2 unit like EP-SE402T2 or EP-SE403T2, the first carrier drives the second sun gear, multiplying torque and dividing speed a second time. In EP-SE406BT3, a third stage is added: the second carrier drives the third sun gear, and the third ring gear (integral to the rotating housing drum) delivers the final output. Each of the three carriers in EP-SE406BT3 serves as what the source page describes as a “torque transfer bridge” \u2014 and it is an apt description. Three bridges, each reducing speed and raising torque by approximately the same factor, combine to produce 24,000 N\u00b7m from a 3,500 rpm motor input in a housing that fits within a standard 100-tonne class crawler undercarriage frame dimension. The fact that this is a track drive planetary gearbox operating at the upper end of the SE series makes the three-stage design both the logical and necessary engineering solution for the rated torque at this weight class.<\/p>\n<\/section>\n

<\/p>\n

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Why i=63\u2013136 \u2014 Purpose-Built for the 100\u2013200 Tonne Machine<\/h2>\n
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The Speed Reality of 100\u2013200 t Machines<\/h3>\n

A 150-tonne mining excavator’s maximum productive travel speed is approximately 1.2\u20132.0 km\/h on flat prepared ground \u2014 limited not by gearbox ratio but by machine stability, ground pressure, and hydraulic circuit capacity. At i=63 with a 3,500 rpm motor input and 400 mm sprocket radius, EP-SE406BT3 delivers approximately 2.3 km\/h at the track \u2014 right at this machine class’s practical limit. There is no engineering requirement to travel faster. The additional ratio range of i=23 in EP-SE406AT serves the lower-weight machines in its class, not the 100\u2013200 t class. For this weight class, i=63 is already the fast end of the useful range.<\/p>\n<\/div>\n

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24,000 N\u00b7m Within i=63\u2013136 \u2014 Margin vs Requirement<\/h3>\n

A 150-tonne mining excavator on a 20\u00b0 gradient requires approximately 2 \u00d7 T_required = 2 \u00d7 W \u00d7 sin20\u00b0 \u00d7 r to move, where T per drive is approximately 150,000 \u00d7 sin20\u00b0 \u00d7 0.4 \u00f7 2 = 10,260 N\u00b7m per drive before shock factor. Apply a 1.8\u00d7 dynamic shock factor (typical for rocky terrain with sudden hard-ground engagement during bucket crowd cycles): 18,468 N\u00b7m per drive \u2014 within EP-SE406BT3’s 24,000 N\u00b7m rated capacity with a 30% safety margin. That margin is important: it means the machine can work into gradient conditions slightly steeper than the design case, or with soil rolling resistance higher than the baseline calculation assumed, without the drive operating at its torque limit. The spring brake at i=100 provides 43,000 N\u00b7m per drive parking hold \u2014 more than twice the machine’s tractive requirement on the same gradient, providing a parking safety factor well above the minimum regulatory requirement in most markets for this machine weight class. The i=63\u2013136 range covers the 100\u2013200 tonne machine class across its entire practical operating speed and load range with appropriate margins throughout the ratio band.<\/p>\n<\/div>\n

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Ratio Selection Within i=63\u2013136<\/h3>\n

Specify ratio at order using three inputs: (1) required maximum travel speed in km\/h, (2) sprocket pitch radius in mm, and (3) maximum motor input speed at maximum pump flow. Formula: i = (n_motor \u00d7 2\u03c0 \u00d7 r) \u00f7 (v_machine \u00d7 1000\/60). Example: 3,200 rpm motor, 400 mm sprocket, 1.8 km\/h target \u2192 i = (3200 \u00d7 2\u03c0 \u00d7 0.4) \u00f7 (1.8 \u00d7 1000\/60) = 8,042 \u00f7 30 = 268 \u2014 too high, indicating the motor displacement needs to increase or the travel speed target revised downward to match the i=63\u2013136 available range. Korea Ever-Power assists with this calculation at no charge, same day as enquiry, and can also confirm whether any available standard ratio within i=63\u2013136 exactly matches or closely approximates the calculated requirement \u2014 with the deviation in travel speed expressed as a percentage for engineering sign-off.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

Applications \u2014 100 to 200+ Tonne Machine Class<\/h2>\n

This triple-stage track drive planetary gearbox serves the upper tier of the crawler equipment weight class \u2014 machines where 17,000 N\u00b7m of EP-SE406AT is insufficient and 24,000 N\u00b7m with a focused ratio band is the engineering solution.<\/p>\n

\n
\n

Super-Heavy Mining Excavators \u2014 100\u2013250 Tonnes<\/h3>\n

Large-capacity mining excavators in the 100\u2013250 tonne class \u2014 operating in open-pit iron ore, copper, and gold mines \u2014 require track drives that the 17,000 N\u00b7m SE406AT cannot cover with adequate safety margin. At operating weights of 130\u2013200 tonnes on iron ore mine floor gradients up to 15\u00b0, required tractive force per drive (including dynamic shock factor) approaches or exceeds the SE406AT’s limit. EP-SE406BT3 at 24,000 N\u00b7m covers this class with the margin required for sustained operation. These machines travel slowly and rarely require the fast repositioning ratios of SE406AT \u2014 i=90\u2013120 is the typical operating ratio for this weight class.<\/p>\n<\/div>\n

\n

Super-Heavy Crawler Cranes \u2014 100\u2013500 Tonne Class<\/h3>\n

Super-heavy crawler cranes in the 100\u2013500 tonne gross vehicle weight class use EP-SE406BT3 for the undercarriage travel drives. These machines position at very low speeds (under 0.3 km\/h during crane work) and require maximum tractive force to move the crane when fully counterweighted across compacted but uneven site surfaces. The spring brake provides the mechanical chassis hold during lift cycles \u2014 with 430 N\u00b7m \u00d7 i=110 = 47,300 N\u00b7m per drive at the sprocket, the hold capacity substantially exceeds any positioning requirement for even the heaviest machine in this class.<\/p>\n<\/div>\n

\n

Heavy Rotary Drilling Rigs and Foundation Machines<\/h3>\n

Super-heavy rotary drilling rigs and diaphragm wall crane systems in the 100\u2013200 tonne chassis class require EP-SE406BT3 for travel drives. These machines carry the full weight of the mast, rotary head, kelly bar (which can extend to 100 m depth), and counterweight system during repositioning between bore locations. The spring brake provides position hold with the kelly bar suspended mid-depth \u2014 a condition where any chassis movement would be hazardous to both the hole and the machine structure.<\/p>\n<\/div>\n

\n

Large Mobile Crushing Plants<\/h3>\n

Tracked primary gyratory and jaw crushers above 100 tonnes operating weight require EP-SE406BT3 for the travel drives. The nodular iron housing sustains the sustained high-amplitude vibration from the crusher mechanism without micro-fracturing \u2014 the failure mode of grey iron housing alternatives. The floating mechanical face seals withstand the fine iron ore, limestone, and granite dust that abrades rubber seals within hundreds of operating hours in hard-rock quarry environments.<\/p>\n<\/div>\n

\n

Heavy Forestry \u2014 Large-Frame Feller Bunchers<\/h3>\n

Large-frame tracked feller bunchers and heavy timber haulers exceeding 100 tonnes operating weight require EP-SE406BT3 when terrain gradients and machine weight exceed the SE406AT’s capacity. In commercial logging operations in British Columbia, Scandinavia, and Siberia, machines drag multi-tonne timber bundles across slopes with frozen or saturated ground conditions that impose sustained maximum tractive effort. The downstream agricultural and forestry multi-output gearboxes<\/a> serving the harvester head and conveyor systems operate on separate PTO circuits from the EP-SE406BT3 travel drives.<\/p>\n<\/div>\n

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Tunnelling and Underground Heavy Transport<\/h3>\n

Large tracked back-hoe muckers, heavy invert segment transporters, and super-heavy maintenance platforms in metro and road tunnelling operations require EP-SE406BT3 for the travel drives. These platforms move at very low speed \u2014 typically 0.5\u20131.5 km\/h \u2014 and must sustain full load during continuous operation in high-humidity, 100% enclosed tunnel environments. The floating metal face seals maintain oil containment under the constant water spray from tunnel ventilation and groundwater infiltration. Auxiliary winch drives on the same platforms use worm gear reducers<\/a> for cable drum self-locking hold independent of the EP-SE406BT3 travel drive spring brake.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"track<\/p>\n

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250 kg and +90\u00b0C \u2014 Mass as a Thermal Asset<\/h2>\n

The EP-SE406AT weighs 185 kg and is rated to +85\u00b0C. The EP-SE406BT3 weighs 250 kg (35% more mass) and is rated to +90\u00b0C \u2014 5\u00b0C higher. This relationship between higher mass and higher temperature limit is not a coincidence. It reflects how nodular cast iron housing mass functions as a thermal management resource in a track drive.<\/p>\n

\n
\n

Thermal Mass \u2014 What 250 kg of Nodular Iron Provides<\/strong><\/p>\n

The specific heat capacity of nodular cast iron is approximately 500 J\/(kg\u00b7K). At 250 kg, the EP-SE406BT3 housing can absorb approximately 125,000 J of heat per degree Kelvin of temperature rise. For a drive generating 5 kW of heat from gear mesh losses (at >94% efficiency, 100 kW input), the housing heats at approximately 5,000\/125,000 = 0.04\u00b0C per second. This means the housing takes approximately 37 minutes to heat from +25\u00b0C ambient to +90\u00b0C limit under continuous maximum load \u2014 providing substantial thermal inertia for intermittent and semi-continuous duty cycles typical of mining and construction travel operations.<\/p>\n<\/div>\n

\n

Surface Area \u2014 Larger Housing Dissipates More Heat<\/strong><\/p>\n

Natural convection heat transfer is proportional to exposed surface area. The 250 kg EP-SE406BT3 housing has approximately 35% more outer surface area than the 185 kg SE406AT housing. At +50\u00b0C temperature differential to ambient (+25\u00b0C ambient, housing at +75\u00b0C), the larger housing dissipates correspondingly more heat per unit time by natural convection than the smaller unit \u2014 which is part of why it can sustain +90\u00b0C versus SE406AT’s +85\u00b0C ceiling under similar duty conditions. In applications where the undercarriage frame encloses the drive partially, this self-cooling advantage is reduced \u2014 confirm thermal management with Korea Ever-Power for specific confined installations above +40\u00b0C ambient.<\/p>\n<\/div>\n

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Practical Implication for Hot-Climate Deployment<\/strong><\/p>\n

For a 150-tonne mining excavator operating in the Pilbara or Arabian Peninsula at +45\u00b0C ambient, the EP-SE406BT3’s +90\u00b0C housing limit provides 45\u00b0C of thermal headroom \u2014 adequate for typical travel duty cycles in mining operations, which involve travel intermittently between dig positions rather than sustained maximum-power travel. The SE406AT’s +85\u00b0C limit provides only 40\u00b0C of headroom at the same ambient. For machines with very intensive travel duty cycles at high ambient temperature, confirm the specific duty cycle thermal model with Korea Ever-Power’s application engineering team before specifying either unit.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

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

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

Provide target travel speed (km\/h or output RPM), motor specification, machine gross weight, steepest parking gradient, and incumbent drive model. Korea Ever-Power returns the appropriate ratio from i=63\u2013136; brake adequacy confirmation (430 N\u00b7m \u00d7 selected ratio vs your parking requirement); and explicit dimensional cross-reference against your current drive (spindle bore, drum OD, sprocket bolt circle, motor interface, brake pilot port). Same business day, no charge, no order commitment required.<\/p>\n<\/div>\n

\n
\ud83d\udd29<\/div>\n

Pre-Assembled and Tested \u2014 250 kg, Ready to Mount<\/h3>\n

EP-SE406BT3 is available as a pre-assembled, function-tested package: gearbox + matched high-speed axial piston motor + overcenter valve + pressure relief valve. Before shipping, Korea Ever-Power verifies brake engagement (spring applied \u2192 drum locked) and brake release (15\u201330 bar pilot \u2192 drum free) and fills to the correct oil level. The assembly arrives at machine assembly ready for chassis mounting and hydraulic line connection only \u2014 eliminating all interface and brake function errors at the OEM assembly stage.<\/p>\n<\/div>\n

\n
\ud83c\udfd7<\/div>\n

Installation at 250 kg \u2014 What This Requires<\/h3>\n

EP-SE406BT3 requires a rated lifting device capable of \u2265350 kg (with appropriate safety factor) for installation \u2014 a standard construction site crane, a tracked machine auxiliary lift line with a certified chain sling, or a purpose-built installation hoist mounted above the track frame. Korea Ever-Power’s dimensional drawing specifies the chain wrap attachment points on the housing drum and the angle of lift required for safe spindle entry into the chassis bore. At 250 kg, the unit requires controlled lowering into the spindle bore with precise angular alignment to avoid cross-threading the retaining bolts \u2014 a process that is significantly more sensitive to alignment than lighter single-stage units. Typical installation time is 5\u20137 hours per side by two qualified technicians with appropriate hoisting equipment: one operating the hoist, one guiding the unit into position. Never attempt manual lifting of EP-SE406BT3. Confirm the lifting attachment method, hoisting capacity, and guide procedure with Korea Ever-Power installation documentation before scheduling the installation shift.<\/p>\n<\/div>\n

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

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

Korea Ever-Power stocks all internal components for EP-SE406BT3 by stage: Stage 1 sun gear + planet set, Stage 2 sun gear + planet set, Stage 3 sun gear + planet set, complete 430 N\u00b7m brake disc pack, floating mechanical face seal kits, taper bearing sets for each bearing position, and housing O-ring sets. A failure in Stage 2 gearing does not require Stage 1 and Stage 3 components \u2014 parts are quoted and supplied per the failed stage, not as a complete internal kit.<\/p>\n<\/div>\n

\n
\ud83d\udccb<\/div>\n

Warranty \u2014 12 Months Commissioning \/ 18 Months Ship<\/h3>\n

12 months from commissioning or 18 months from shipment (whichever occurs first), covering all three planetary stages, the brake assembly, and the floating face seals. For OEMs building machines from stocked gearboxes, the 12-month in-service period begins at commissioning \u2014 not at shipping date. Warranty component replacement dispatched from Korea Ever-Power stock independently \u2014 a brake pack failure under warranty is resolved with a brake pack kit, not a complete 250 kg unit return.<\/p>\n<\/div>\n

\n
\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. Pre-assembled motor packages and custom ratios: 30\u201345 days production. For major mining OEMs with recurring fleet requirements, Korea Ever-Power can discuss framework agreements and consignment stocking arrangements to reduce lead times on emergency machine-down replacements. Contact Korea Ever-Power with fleet size, machine model, and annual volume for framework pricing.<\/p>\n<\/div>\n<\/div>\n<\/section>\n

\"track<\/p>\n

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Field Reviews<\/h2>\n
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D<\/div>\n
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D. Hartley \u2014 Mining Equipment OEM, Final Drive Group<\/div>\n
Verified Purchase \u00b7 Perth, Australia<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

Our 160-tonne electric rope shovel conversion project required replacement track drives that could handle 22,000\u201324,000 N\u00b7m rated torque with an appropriate safety margin on 15\u00b0 iron ore mine floor gradients. EP-SE406BT3 at i=100 was the specification Korea Ever-Power recommended. The dimensional cross-reference to our legacy Rexroth drives was confirmed within a business day. Field swap at Pilbara site: 6 hours per side with our 50-tonne crane \u2014 the 250 kg unit required careful positioning during final spindle engagement, but the process was straightforward with the installation guide Korea Ever-Power provided. At 2,400 hours of iron ore mining operation with 45\u00b0C+ summer ambient, no seal, bearing, or gear failures across both drives. Oil samples at 1,000 h showing clean baseline \u2014 no metallic particle elevation or water ingress.<\/p>\n

EP-SE406BT3, i=100 \u00b7 160-t iron ore shovel \u00b7 2,400 h, 45\u00b0C+ ambient, clean oil samples<\/div>\n<\/div>\n
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Y<\/div>\n
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Y. Chen \u2014 Large Crawler Crane OEM<\/div>\n
Verified Purchase \u00b7 Shanghai, China<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We manufacture 250-tonne crawler cranes for bridge and industrial plant construction. At this gross vehicle weight, EP-SE406BT3 at i=120 is the specification for our undercarriage travel drives. The spring brake at i=120 provides 430 \u00d7 120 = 51,600 N\u00b7m per drive, which our calculations confirm holds the fully counterweighted crane stationary on our acceptance test slope of 12\u00b0 with a 2.1\u00d7 safety margin. Korea Ever-Power pre-assembled the gearbox with our specified axial piston motor and set the overcenter valve to our circuit’s back-pressure requirement before shipping \u2014 the complete drive assembly arrived ready for chassis mounting. At 1,800 hours of crane operation across four production units, all drives are performing within specification. The 250 kg unit weight requires dedicated lifting tooling during erection, but this is standard practice for equipment at this crane scale.<\/p>\n

EP-SE406BT3, i=120 \u00b7 250-t crawler crane \u00b7 1,800 h, spring brake 2.1\u00d7 safety margin confirmed<\/div>\n<\/div>\n
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R<\/div>\n
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R. Mackinnon \u2014 Heavy Construction Equipment Rental<\/div>\n
Verified Purchase \u00b7 Calgary, Canada<\/div>\n<\/div>\n
\u2605\u2605\u2605\u2605\u2605<\/div>\n<\/div>\n

We operate a rental fleet of 120-tonne tracked excavators used in oilsands pipeline and infrastructure work across Alberta and British Columbia. Operating conditions include \u221230\u00b0C winter starts, deeply saturated organic ground, and frequent track immersion in water-saturated clay. EP-SE406BT3 cold-start at \u221230\u00b0C with GL-5 VG 150 oil: no resistance on first travel movement, spring brake releases cleanly at 19 bar pilot pressure (within the 15\u201330 bar specification). The floating metal face seals have withstood continuous mud submersion \u2014 the oilsands clay is particularly abrasive, and previous rubber-sealed drives from another supplier were leaking within 300\u2013400 hours. At 3,200 hours across our fleet, we have not had a single seal, bearing, or gear failure on any EP-SE406BT3 unit. 1:1 swap with the European drives we replaced \u2014 no chassis modifications required.<\/p>\n

EP-SE406BT3 \u00b7 120-t oilsands excavator \u00b7 \u221230\u00b0C cold start, 3,200 h, zero seal failures vs 300 h previously<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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

EP-SE406BT3 is the highest-capacity triple-stage planetary gearbox model in this series, representing 24,000 N\u00b7m at the upper bound of the track drive units covered here. Korea Ever-Power’s SE track drive range extends beyond 450,000 N\u00b7m for the largest mining and tunnelling machines, alongside precision servo gearboxes at the opposite end of the torque spectrum.<\/p>\n

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

SE400T1 (1,300 N\u00b7m, T1) through SE406BT3 (24,000 N\u00b7m, T3, this model). Higher-capacity SE series models beyond 24,000 N\u00b7m \u2014 including the SE407 series and above \u2014 are available for the largest mining excavators and underground tunnelling machines. Contact Korea Ever-Power for the extended capacity range.<\/p>\n<\/div>\n

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

P0 \u22641 arcmin to P2. EP-TM, EP-TNF, EP-TEG, EP-TMR series. The Korea Ever-Power\u00a0 \u9ad8\u7cbe\u5ea6\u884c\u661f\u9f7f\u8f6e\u7bb1<\/a> range: from 50 N\u00b7m servo drives to 24,000 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 heavy vehicles. Complete heavy-duty industrial transmission portfolio \u2014 contact Korea Ever-Power for any drive type beyond the SE track series.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Technical FAQ<\/h2>\n
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\u95ee<\/span>The SE406BT3 has the same 430 N\u00b7m brake as SE406AT but delivers 24,000 vs 17,000 N\u00b7m. Does the same brake torque adequately protect a heavier-duty unit?<\/h3>\n

The spring brake torque (430 N\u00b7m) is the same physical spring force applied to the same disc pack design \u2014 but the ratio through which it acts is different and higher in EP-SE406BT3 (i=63\u2013136) than in SE406AT (i=23\u2013220 at the low end). The effective output-side parking hold is 430 N\u00b7m \u00d7 selected ratio. At i=63 (SE406BT3’s lowest ratio), the parking hold is 27,090 N\u00b7m per drive \u2014 already higher than SE406AT at its lowest ratio i=23 (9,890 N\u00b7m per drive). At SE406BT3’s highest ratio i=136, the hold is 58,480 N\u00b7m per drive \u2014 holding approximately 115 tonnes at 15\u00b0 slope per drive pair. The brake is adequate because SE406BT3’s ratio range starts higher than SE406AT’s, so the same 430 N\u00b7m spring force provides proportionally greater output-side hold across the entire i=63\u2013136 range.<\/p>\n<\/div>\n

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\u95ee<\/span>Why does EP-SE406BT3 (triple-stage, >94%) show lower efficiency than EP-SE406AT (multi-stage, >95%)?<\/h3>\n

The efficiency figures come from the Korea Ever-Power source specifications for each model and reflect tested performance at rated conditions: >95% for EP-SE406AT and >94% for EP-SE406BT3. The 1% difference is consistent with three stages of epicyclic reduction having marginally more cumulative mesh loss than the SE406AT’s arrangement \u2014 even when each individual stage is optimised. In absolute terms, at 100 kW input: EP-SE406AT generates \u22645 kW heat, EP-SE406BT3 generates \u22646 kW heat \u2014 a difference of 1 kW, well within the thermal capacity of the 250 kg nodular iron housing. The >94% figure for EP-SE406BT3 is meaningfully higher than the theoretical 0.97\u00b3 \u2248 91% for three stages at standard efficiency \u2014 indicating the use of optimised helical or high-tooth-count gear geometry in the triple-stage configuration. Korea Ever-Power can provide factory acceptance test efficiency data for specific ratio configurations upon request.<\/p>\n<\/div>\n

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\u95ee<\/span>What oil volume and maintenance schedule applies to the triple-stage housing?<\/h3>\n

The triple-stage EP-SE406BT3 housing contains a larger oil volume than any preceding SE model \u2014 typically 8.0\u201312.0 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 through the highest port in operating orientation; check level at the side port. The three-stage gear train generates three sets of run-in wear particles during the initial 150-hour break-in period \u2014 the first oil change at 150 hours is critical to remove particles from all three stages simultaneously before they circulate through bearings and gear flanks. Drain while warm (metallic particles remain suspended in warm oil for complete removal), allow 15+ minutes of drain time before sealing, then refill with fresh API GL-5 oil of the same grade and viscosity. Subsequent changes at 1,000 hours or annually. Do not mix oil grades \u2014 adding VG 220 to a VG 150-filled unit, for instance, changes the combined viscosity-temperature profile and may affect lubrication adequacy at cold-start temperatures where the mixed oil is thicker than either grade alone would be at the same temperature. At 250 kg with 8\u201312 L oil volume, the larger oil volume provides significant additional thermal buffer compared to lighter SE units \u2014 a key contributor to the +90\u00b0C operating limit. Oil temperature at the fill port (not housing surface) should be monitored if any sustained high-duty-cycle travel is suspected of approaching the +90\u00b0C housing limit in hot ambient conditions. Korea Ever-Power recommends monitoring housing surface temperature with a contact thermometer at 250-hour intervals during the first year of operation on a new installation, to establish the unit’s thermal baseline for the specific machine and duty cycle.<\/p>\n<\/div>\n

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\u95ee<\/span>Is EP-SE406BT3 a direct dimensional replacement for Rexroth GFT or Bonfiglioli 700C triple-stage units?<\/h3>\n

For triple-stage units in the 24,000 N\u00b7m torque class with matching ratio range (i=63\u2013136), EP-SE406BT3 is dimensionally matched to the equivalent Rexroth GFT and Bonfiglioli 700C high-torque models at this class. Korea Ever-Power provides an explicit dimensional cross-reference \u2014 spindle bore, drum OD, sprocket bolt circle, motor interface, brake pilot port \u2014 against the specific legacy model number before any order commitment. The ratio configuration of the legacy drive must also match: both the legacy drive and EP-SE406BT3 may offer different ratios within the i=63\u2013136 range. Provide your incumbent model number and the current ratio for Korea Ever-Power to confirm dimensional and kinematic compatibility in the same-day response. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.<\/em><\/p>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

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Specify EP-SE406BT3 \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 calculation, and dimensional confirmation \u2014 same day.<\/p>\n

24,000 N\u00b7m \u00b7 i=63\u2013136 \u00b7 Triple-Stage T3 \u00b7 430 N\u00b7m spring brake \u00b7 >94% \u00b7 \u221225\u00b0C to +90\u00b0C \u00b7 ~250 kg<\/p>\n

Request Quote \u2192
\n<\/a><\/div>\n<\/section>\n

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

\n
\u2605 Three Stages, Not Two \u2014 Why the Extra Stage Matters at 24,000 N\u00b7m<\/div>\n

Every other high-torque unit in this series \u2014 including EP-SE406AT at 17,000 N\u00b7m \u2014 uses one or two principal reduction stages in the multi-stage arrangement. The EP-SE406BT3 explicitly uses three successive epicyclic stages (T3) in a single rotating-housing package. This is not simply an incremental extension of the two-stage concept: three stages allow each individual stage to operate at a comparatively modest ratio (approximately i^(1\/3) per stage, giving 4.0\u20135.1 per stage across the i=63\u2013136 range), keeping every stage within the high-efficiency operating zone of planetary gearing. The result is a 24,000 N\u00b7m unit that, despite three stages of reduction, maintains >94% stated efficiency \u2014 a figure that reflects the optimised tooth geometry and gear mesh conditions at these individual stage ratios.<\/p>\n

The i=63\u2013136 ratio band might appear narrower than the 9.6\u00d7 span of EP-SE406AT \u2014 and it is. But for 100\u2013200 tonne machines, this is exactly right: they travel at 0.5\u20132 km\/h and have no engineering requirement for the fast repositioning ratios that SE406AT covers. EP-SE406BT3 is purpose-built for this weight class at this speed band.<\/p>\n<\/div>","protected":false},"featured_media":827,"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-824","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\/zh\/wp-json\/wp\/v2\/product\/824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/comments?post=824"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/media\/827"}],"wp:attachment":[{"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/media?parent=824"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/product_brand?post=824"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/product_cat?post=824"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/planetary-gearboxes.com\/zh\/wp-json\/wp\/v2\/product_tag?post=824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}