EP-SE410T3 Triple-Stage Track Drive Planetary Gearbox

Der EP-SE410T3 is a triple-stage track drive planetary gearbox rated at 50,000 N·m — the highest torque in the Korea Ever-Power SE series covered here. Its rotating outer housing carries the track sprocket on the drum flange directly, without a separate output shaft. The triple-stage T3 architecture operates across i=62–177, with the extended high-ratio band (i=136–177) being the differentiating capability that distinguishes EP-SE410T3 from the 36,000 N·m EP-SE407T3. At 420 kg, installation requires a certified lift of ≥600 kg capacity.

Fast repositioning range for the 350–600 t class. Large mining excavators moving between dig positions at 1–2 km/h on haul road. Crawler cranes repositioning between lifts with boom in transit configuration. Both SE407T3 and SE410T3 cover this range — choose SE407T3 if this is the primary use and 36,000 N·m is sufficient for the required tractive force.

Standard slow-travel range for this machine class: 400–600 tonne crawler excavators at 0.5–1 km/h in working configuration; super-heavy crawler cranes positioning under full counterweight. Both SE407T3 and SE410T3 cover this range. SE410T3 is required at this range only if the machine's tractive force calculation with shock factor exceeds 36,000 N·m — i.e., machine weight and gradient require the full 50,000 N·m with safety margin.

The range that SE407T3 cannot reach. At i=177, a 3,500 rpm motor drives the sprocket at approximately 20 rpm — on a 500 mm radius sprocket, this is roughly 0.3 km/h. This ultra-slow speed is required for: (1) super-heavy crawler cranes during pick-and-carry moves with the full load suspended, where centimetre-level positioning accuracy is required; (2) large surface miner machines during continuous rock-cutting advance, where travel speed matches the cutting drum penetration rate; (3) large piling rigs during insertion of casing segments with tight positional tolerance; (4) specialised tracked platforms in shipyard, nuclear facility, or industrial module yard environments where precise ground-level positioning is mandatory.

Speed comparison at full ratio range:
SE407T3 max (i=136): 25.7 rpm → ~0.41 km/h (500mm r)
SE410T3 max (i=177): 19.8 rpm → ~0.31 km/h (500mm r)
Difference: 0.10 km/h slower — significant for precision positioning

Brake equivalent comparison at max ratio:
SE406BT3 max (i=136): 430 × 136 = 58,480 N·m/drive
SE407T3 max (i=136): 530 × 136 = 72,080 N·m/drive
SE410T3 max (i=177): 530 × 177 = 93,810 N·m/drive ← highest

Ultra-Heavy Mining Excavators — 350–600+ Tonnes

Mining hydraulic excavators in the 350–600 tonne operating weight range — machines used for mass stripping and loading in large open-pit iron ore, copper porphyry, and oil sands mines — require EP-SE410T3 for the undercarriage track drives. At 500 tonnes gross on a 15° bench gradient with a 1.7× shock factor, the required drive torque per side approaches or exceeds EP-SE407T3's 36,000 N·m rated capacity. EP-SE410T3 at 50,000 N·m provides the 28–39% torque safety margin that this machine class requires above the calculated continuous-travel torque, accommodating soil condition variation and peak breakout forces. The floating metal face seals sustain the fine iron ore and copper concentrator dust environment, which destroys rubber-sealed alternatives within hundreds of operating hours. The nodular cast iron housing at 420 kg provides thermal inertia that helps sustain continuous operation in the +40°C+ ambient temperatures common to open-pit mining in tropical and desert environments, while the >94% efficiency minimises heat generation in the gear train itself relative to the machine’s total hydraulic power output.

Super-Heavy Crawler Cranes — Pick-and-Carry at i=177

Crawler cranes in the 500–1,000 tonne gross vehicle weight class performing pick-and-carry operations — lifting a load and walking with it suspended — require EP-SE410T3 at i=136–177 for the travel drives. The travel speed during pick-and-carry is extremely low (under 0.3 km/h typically) and requires precise hydraulic motor speed control to maintain safe load positioning during the move. At i=177, the 20 rpm sprocket speed provides fine hydraulic flow control without needing additional flow throttling valves in the travel circuit. The spring brake at i=177 holds 93,810 N·m per drive — the safety hold for an emergency hydraulic failure during a loaded carry, which is a mandatory fail-safe for crane operations with suspended loads.

Mining Rope Shovels — Travel Drive Undercarriage

Large electric rope shovels in the 3,000–5,000 tonne class use EP-SE410T3 (or larger SE models) for the track propel drives. These machines travel slowly (typically 1.5–3 km/h) but at enormous weight. The rope shovel undercarriage imposes static and dynamic loads far exceeding any hydraulic excavator in the same equipment yard, requiring the full 50,000 N·m capacity of EP-SE410T3 per track unit with adequate margin. The spring brake engagement on pilot pressure loss is particularly important for rope shovels, which must stop immediately and hold position when a hydraulic circuit fault is detected, given the machine's massive inertia and the confined space of the shovel loading face.

Large Continuous Surface Miners

Continuous surface miners in the 500–1,000 tonne class — machines that cut and remove rock or mineral without drilling and blasting, using a rotating drum cutter — travel at very low constant speed matched to the cutting drum's penetration rate. EP-SE410T3 at i=150–177 provides the required ultra-slow advance speed (sometimes under 0.2 km/h) while maintaining the full 50,000 N·m tractive force to push the cutting drum through hard rock. The precision of ratio selection within i=62–177 allows the travel speed to be matched to the specific rock hardness and cutting drum diameter to optimise specific energy consumption per tonne of material.

Large Foundation and Geotechnical Platforms

Super-heavy full-casing oscillators and large cased bored pile machines in the 400–700 tonne class require EP-SE410T3 for the travel drives when machine weight and gradient combination exceeds SE407T3's threshold. These machines carry the oscillator table, casing segments, and counterweight system during repositioning between bore locations. The spring brake at i=136–177 provides the mechanical position hold during casing segment splicing operations, when the chassis must remain absolutely stationary while the oscillation action continues. Auxiliary winch drives for casing extraction use worm gear reducers for self-locking cable hold, independent of the EP-SE410T3 travel drive spring brake circuit.

Heavy Tracked Agricultural Platforms — Largest Class

Experimental and specialised tracked agricultural platforms at the 400+ tonne class — large autonomous soil cultivation systems and heavy tracked land-clearing systems in major agricultural development projects — require EP-SE410T3 for the travel final drives when ground conditions impose maximum tractive effort requirements. The downstream agricultural multi-output gearboxes for the tillage tools, disc systems, and cutting assemblies on these platforms operate on independent power circuits from the EP-SE410T3 travel drives — the travel drive handles locomotion only.

EP-SE410T3 weighs approximately 420 kg versus EP-SE407T3's 350 kg — a 70 kg (+20%) increase. This 20% mass increase accommodates a 39% torque increase and a 30% ratio range extension. Why does the mass not grow proportionally with the torque increase? Three factors explain the efficiency of the scale-up in this case:

Ratio, Brake Adequacy, and Fit — Same Day

Provide target travel speed or output RPM, motor specification, machine gross weight, steepest parking gradient, and incumbent drive model. Korea Ever-Power returns the specific ratio from i=62–177 that meets your kinematic requirement; confirmation that 530 N·m × ratio exceeds your parking hold requirement; and dimensional cross-reference — spindle bore, drum OD, sprocket BCD, motor interface, brake pilot port — same business day, no charge, no order commitment.

Pre-Assembled and Function-Tested — 420 kg, Ready to Mount

Available pre-assembled with matched high-speed axial piston motor, overcenter valve, and pressure relief valve. Before shipping: brake function verified (pilot applied → drum free, pilot released → drum locked within 1 second), oil filled to level. Arrives ready for crane lifting into chassis bore and hydraulic line connection. Eliminates brake function errors and motor-interface issues at machine assembly stage. For major OEMs building multiple units per production run, pre-assembled and pre-tested EP-SE410T3 assemblies reduce final assembly time by approximately 4–6 hours per crawler unit compared to individual component installation and on-machine commissioning.

Stage-Level Spare Parts — 420 kg Serviced, Not Replaced

Korea Ever-Power stocks all internal components for EP-SE410T3 by stage: Stage 1, 2, and 3 planet set and sun gear assemblies; 530 N·m brake disc pack; dual-cone floating face seal kits; taper bearing sets per bearing position; housing O-ring kits. Failure in one stage does not require components from other stages. At 420 kg unit cost, component-level repair is always the correct economic approach outside warranty.

12/18-Month Warranty — Three Stages, Brake, Seals

12 months from commissioning or 18 months from shipment, covering all three planetary stages, the 530 N·m brake assembly, and the floating face seals. For OEMs stocking units ahead of machine assembly, the 12-month in-service period begins at commissioning. Warranty components shipped from stock without return of the complete 420 kg unit for component-level failures.

7–14 Days Stock · 30–45 Days Custom

Standard ratio configurations from Korea Ever-Power stock in 7–14 days. Pre-assembled motor packages and custom ratios: 30–45 days. For major mining OEMs and crawler crane builders with recurring requirements, Korea Ever-Power can discuss framework supply agreements and consignment stock arrangements to eliminate lead time risk on machine-down emergencies at 420 kg unit scale.

−25°C to +90°C — Standard Configuration

EP-SE410T3 maintains the same −25°C to +90°C operating range as SE407T3. At 420 kg, the nodular iron thermal mass is 420 × 500 J/(kg·K) = 210 kJ per degree Kelvin — the highest thermal inertia in the SE series presented here, providing the longest thermal run-up time before housing temperature rises under sustained full-load operation. For operation at continuous ambient temperatures above +40°C with high duty cycles, Korea Ever-Power provides a thermal assessment based on the specific hydraulic circuit power and machine duty cycle, at no charge on request. The 420 kg nodular iron thermal mass — 210 kJ per degree Kelvin — provides the longest thermal run-up time in the SE series, meaning housing temperature rises more slowly under sustained load than in any lighter SE unit. In practice, for mining excavators in +45°C ambient with intermittent travel cycles (typical of excavator operation), the housing temperature in field measurements has remained below +88°C in most reported installations. Viton and other specialised seal compounds are available for operation outside the standard −25°C to +90°C envelope — specify at enquiry stage if the installation conditions require this.

Our 480-tonne hydraulic mining excavator required EP-SE410T3 — the machine's gross operating weight on our 18° high-wall bench grades put the required drive torque with 1.8× shock factor above the EP-SE407T3 threshold. Korea Ever-Power confirmed the ratio selection at i=110 and provided same-day dimensional confirmation against our previous drives. The 420 kg unit required our site's 50-tonne crane for installation — Korea Ever-Power's dimensional drawing specified the two lift-point chain positions on the drum housing, and alignment into the spindle bore was completed in approximately 90 minutes per side. At 2,600 hours of iron ore mining operation in +42°C summer ambient, housing surface temperature has peaked at 81°C — well within the +90°C limit. Zero seal, bearing, or gear failures across both drives. Brake verified at every 500-hour service: holds within specification at our acceptance gradient of 20°. We also conduct 1,000-hour oil sampling with elemental analysis: metallic particle content (Fe, Cr, Mo) has tracked within the baseline gear mesh wear range without anomalous spikes, confirming no stage-specific accelerated wear across 2,600 hours. The 7-14 day Korea Ever-Power stock delivery has eliminated the 10-12 week lead times we previously experienced with our European supplier, which is operationally critical for a continuous mining operation.

We manufacture 700-tonne and 1,000-tonne rated crawler cranes for heavy lift operations on offshore platform installations and LNG plant construction. For the 700-tonne class, EP-SE410T3 at i=155 is our standard specification. At i=155, the spring brake equivalent is 530 × 155 = 82,150 N·m per drive — verified to hold our 720-tonne gross machine (fully counterweighted, main boom up) on 12° slopes with a 2.4× safety factor exceeding our type approval requirement. During pick-and-carry operations at i=155, the 22.6 rpm sprocket speed gives precise hydraulic motor speed control without pressure-compensated valves in the travel circuit. Korea Ever-Power pre-assembled units with our specified axial piston motor and set the overcenter valve to our brake release pressure before shipping. We have used EP-SE410T3 on four crane production runs and had zero drive failures in 5,800 total unit operating hours.

We operate a fleet of 400-tonne and 500-tonne hydraulic excavators in copper and limestone quarrying operations in Oman. Ambient temperature reaches +48°C in summer, and the limestone dust is highly abrasive. Our previous European-supplied drives showed oil contamination from dust ingress within 800–1,200 hours — the rubber face seals were failing. After switching to EP-SE410T3, we have run 3,900 hours across four units without a single seal failure or oil contamination event. Housing surface temperature at +48°C ambient with sustained travel duty at i=100: maximum measured 87°C — within the +90°C specification but requiring careful duty cycle management in the hottest summer months. Korea Ever-Power advised us to limit sustained travel to 45 minutes maximum before a 15-minute rest period during the summer peak, which we implemented without production impact. We also began monitoring housing surface temperature with a contact thermometer at each shift start — in practice, the temperature has never approached the 90°C limit during the cooler months, and the 45-minute cycle is only enforced during the June-September peak. The 7–14 day stock delivery has been critical for our fleet — we previously waited 14–18 weeks for European parts, which is operationally unacceptable in continuous mining operations.

QWhat is the exact difference between EP-SE407T3 (36,000 N·m) and EP-SE410T3 (50,000 N·m)? Which should I specify?

EP-SE407T3 and EP-SE410T3 are both T3 triple-stage units with the same 530 N·m spring brake, >94% efficiency, −25°C to +90°C operating range, and oil bath lubrication. The EP-SE410T3 provides: (1) 50,000 N·m rated torque vs 36,000 N·m (+39%), serving machines where the calculated drive torque with dynamic shock factor exceeds 32,000–35,000 N·m (leaving inadequate margin at SE407T3's rating); (2) ratio range extended to i=177 vs SE407T3's i=136, providing the additional slow-speed precision range needed for pick-and-carry cranes, surface miners, and precision positioning platforms; and (3) 530 N·m brake effective at i=177 producing 93,810 N·m per drive vs SE407T3's maximum of 72,080 N·m at i=136. Choose EP-SE410T3 when either the torque or the ratio extension — or both — are required. If EP-SE407T3 covers the required torque with an adequate safety margin AND the i=63–136 ratio range meets the required output speed, EP-SE407T3 is the correct and lighter choice at 350 kg vs 420 kg. Korea Ever-Power will perform both calculations for your machine at no charge, same day. For machines at the boundary between EP-SE407T3 and EP-SE410T3 capability, Korea Ever-Power can provide a side-by-side selection sheet showing the safety margin in both cases — enabling an informed engineering decision rather than a conservative default to the larger unit when the smaller would actually suffice.

QThe spring brake torque is the same (530 N·m) as EP-SE407T3. How does EP-SE410T3 provide adequate parking hold at the higher machine weight class?

The effective parking hold is 530 N·m × ratio. EP-SE410T3's extended ratio range to i=177 means the maximum effective brake hold is 530 × 177 = 93,810 N·m per drive — 30% higher than EP-SE407T3's maximum of 530 × 136 = 72,080 N·m. Additionally, the 350–600 tonne machines served by EP-SE410T3 typically specify higher ratios (i=100–177) than the 200–350 tonne machines served by SE407T3 (i=80–136), so the actual ratio in the specified configuration already provides higher brake amplification even at intermediate ratios. The brake is adequate not because it is heavier, but because it is combined with a higher ratio than SE407T3 would use for the same machine. Korea Ever-Power confirms brake adequacy for the specific ratio, machine weight, and gradient at enquiry stage — this calculation is provided before any order commitment. If the brake adequacy calculation shows marginal hold at the machine’s steepest parking gradient, Korea Ever-Power can advise on whether a higher ratio within i=62–177 resolves the issue or whether supplementary counterbalance valves in the hydraulic circuit should be considered alongside the spring brake for additional safety. This design consultation is also provided at no charge.

QOil volume, first-change procedure, and maintenance schedule for the 420 kg triple-stage unit?

EP-SE410T3 contains approximately 15.0–22.0 litres of gear oil depending on the specific ratio configuration and motor adapter — the exact fill volume is on the Korea Ever-Power dimensional drawing for your configuration. The larger oil volume is the highest in the SE series as presented here and contributes to the unit's thermal inertia alongside the 420 kg housing mass. First oil change at 150 operating hours: drain while warm (allow 20+ minutes drain time to remove all three stages' run-in particles from the larger oil volume), then refill with fresh API GL-5 VG 150 (below +15°C ambient) or VG 220 (above +15°C ambient). Subsequent changes: every 1,000 hours or annually. Do not mix oil grades or add viscosity improver additives — these affect the thermal viscosity-temperature profile at cold start. At 420 kg, the oil drain port is accessible from below the unit in the standard installation orientation; confirm port access angle with Korea Ever-Power installation documentation before scheduling the first-change service. The larger oil volume at 15.0–22.0 litres also means the oil sampling interval for condition monitoring is more valuable at this torque class: drawing a 100 ml oil sample at each 500-hour interval and testing for metallic particle content gives early warning of stage-specific wear before it progresses to a costly failure. Korea Ever-Power can advise on oil sampling protocol and elemental analysis interpretation for EP-SE410T3 on request.

QIs EP-SE410T3 a direct dimensional replacement for Rexroth GFT 60/80 T3 or Bonfiglioli 700C 715C equivalents?

For triple-stage units in the 50,000 N·m torque class with matching ratio range (i=62–177), EP-SE410T3 is dimensionally matched to the equivalent Rexroth GFT and Bonfiglioli 700C models. Korea Ever-Power provides an explicit dimensional cross-reference document before any order — spindle bore diameter and fit class, drum OD, sprocket bolt circle, hydraulic port thread and position, motor interface spigot — against your specific legacy model number. At this torque class, there may be variants within the GFT or 700C family (different axial lengths for different stage configurations), and the Korea Ever-Power cross-reference confirms which specific EP-SE410T3 configuration matches your incumbent. Provide the full model number (including ratio code if present) of the drive you are replacing for the most accurate same-day cross-reference response. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.