EP-SE413T3 Triple-Stage Track Drive Planetary Gearbox

The EP-SE413T3 is a triple-stage track drive planetary gearbox rated at 60,000 N·m — the highest torque in the Korea Ever-Power SE series covered here. Its ratio range i=86–172 serves the slow-travel, ultra-high-torque machine class exclusively: the 500–700+ tonne mining excavators, very large electric rope shovels, and the heaviest crawler crane undercarriages where speed is not the priority and torque capacity with adequate safety margin is the only engineering specification that matters.

In a triple-stage planetary unit, the total ratio is the product of the three individual stage ratios: i_total = i_1 × i_2 × i_3. For a total ratio of i=62 (SE410T3's minimum), the three stages must collectively achieve 62-fold reduction — but one way to reach 62 is through an uneven distribution where one stage provides very little reduction. For i=86 (SE413T3's minimum), each stage can be configured more uniformly: each stage of approximately i^(1/3) = 4.4 per stage. A more uniform distribution means the highest-loaded stage carries less torque relative to the unit's maximum capacity. This leaves headroom in the same housing to rate the overall unit at a higher maximum torque — the 60,000 N·m figure — because the final stage is not the sole bottleneck that limits the output.

EP-SE410T3 achieves 50,000 N·m at approximately 420 kg — a torque density of approximately 119 N·m/kg. EP-SE413T3 achieves 60,000 N·m at the same approximately 420 kg — approximately 143 N·m/kg. This 20% improvement in torque-per-kilogram is a meaningful engineering accomplishment for a rotating-housing planetary unit at this torque class. It means the machine designer does not need to allocate more undercarriage weight, more chassis space, or a heavier lifting crane for installation to step up from SE410T3 to SE413T3 capability. The same 420 kg installation, the same ≥600 kg crane requirement, the same installation procedure — but 10,000 N·m more output.

EP-SE410T3 includes ratios as low as i=62 to provide fast repositioning speed for its 350–600 tonne machine class. EP-SE413T3's 500–700+ tonne machines do not need i=62. A 600-tonne mining excavator on a standard mine haul road travels at maximum 1.0–1.5 km/h — equivalent to approximately 40 rpm at a 600 mm sprocket radius. EP-SE413T3's lowest ratio of i=86 produces exactly ~40.7 rpm at 3,500 rpm motor input — hitting this machine class's practical maximum travel speed precisely, without the additional ratio range that SE413T3's three-stage design would need to accommodate a lower starting ratio. Eliminating i=62–85 from the requirement allows the T3 stage configuration to be optimised purely for the i=86–172 range where these machines actually operate — and that optimisation is what yields the extra torque capacity.

Across the Korea Ever-Power SE series as presented here, spring brake torque has increased progressively with machine class: from 130 N·m at SE400T1 (3–5 t) to 610 N·m at SE413T3 (500–700+ t). EP-SE413T3's 610 N·m is the highest spring brake specification in this range — 15% above EP-SE410T3's 530 N·m, and the first SE unit to exceed 600 N·m. Why does the brake increase here, when SE410T3 uses the same 420 kg housing?

Ultra-Heavy Mining Excavators — 500–800+ Tonnes

Mining hydraulic excavators above 500 tonnes operating weight — used in bulk stripping of overburden and loading in the world's largest open-pit copper, iron ore, and coal mines — require EP-SE413T3 for the undercarriage track drives. At 600 tonnes gross on a 15° ore bench, the required tractive force per track unit, including a 1.7× dynamic shock factor for hard rock, requires torque capacity at or above 50,000 N·m with meaningful safety margin. EP-SE413T3 at 60,000 N·m provides the approximately 20% headroom that sustained mining travel on variable-hardness ore floor demands. The floating metal face seals sustain the sub-10-micron mineral dust environment that characterises large-scale mining — at this scale, seal failure means not just gearbox damage but a machine-down event with multi-day production impact measured in thousands of tonnes of ore not extracted. Korea Ever-Power's dual-cone floating metal face seals have been verified in these exact conditions across the SE series by multiple mining OEMs at 3,000+ hours without replacement, providing the proven reliability record that procurement engineers at major mining companies require before standardising a component across a fleet.

Very Large Electric Rope Shovels

Electric rope shovels in the largest production classes — machines with dipper handles that can reach 30–40 metres depth and bucket capacities exceeding 60 cubic metres — may use EP-SE413T3 for the propel (travel) drive units in the undercarriage. These machines are among the heaviest tracked machinery in operation at any mine site, with operating weights that can reach 1,000 tonnes and above. The travel cycle for rope shovels is intermittent — the machine pivots and tramming distances are short — but the tractive force required to move the machine through mine floor conditions (soft muck, wet ore, uneven bench surfaces) requires the full 60,000 N·m per drive with adequate safety margin. The spring brake at i=150+ is the position hold for the machine when the bucket is in the digging face position between swings.

Largest Super-Heavy Crawler Cranes

Crawler cranes above 1,000 tonne rated lift capacity — machines used for heavy module installation on offshore platform construction and reactor vessel installation in power plants — have gross vehicle weights that can exceed 600 tonnes in working configuration. EP-SE413T3 provides the travel undercarriage drives for these machines, where the combination of machine weight, traction requirements on prepared concrete pads, and the need for absolute parking hold during lift operations requires 60,000 N·m capacity per drive. At i=140–172, the travel speed during positioning under a suspended heavy load is less than 0.5 km/h — within EP-SE413T3's operating range, and slow enough to maintain millimetre-level positioning precision via hydraulic motor flow control.

Large Continuous Surface Miners — Heavy Rock Class

Continuous surface miners at the upper end of the production class — cutting limestone, dolomite, and hard rock formations at 500+ tonnes machine weight — require EP-SE413T3 for the track propel drives. At i=100–130, the travel speed during continuous cutting advance matches the penetration rate of the cutting drum through hard rock. The 60,000 N·m capacity ensures adequate traction even in very hard rock where the drum encounters sudden resistance peaks that create instantaneous tractive force demands well above the calculated steady-state value. The floating seal system maintains contamination-free oil in the heavy rock dust and water spray environment typical of continuous surface mining operations.

Heavy Tracked Forestry — Extra-Large Class

Extra-large tracked forestry transport platforms and heavy specialised logging equipment at the top of the commercial forestry weight class require EP-SE413T3 when terrain conditions and machine weight push the required drive torque beyond EP-SE410T3's 50,000 N·m capacity. In boreal and taiga timber harvesting, where frozen ground and saturated organic soil impose sustained maximum tractive effort, the 60,000 N·m capacity with the 610 N·m spring brake provides the engineering margin that safe steep-slope timber operations in winter conditions demand. The downstream agricultural and forestry multi-output gearboxes for logging crane and conveyor drives operate on separate PTO circuits, independent of the EP-SE413T3 travel drives.

Specialised Industrial and Port Tracked Transport

Ultra-heavy industrial transport platforms — reactor pressure vessel movers, large industrial module skid systems, and port-side heavy precast element transporters above 500 tonnes payload — use EP-SE413T3 at high ratios (i=140–172) for the crawler travel drives. At these extreme loads, travel speed is measured in metres per minute rather than km/h, and the spring brake function is engaged whenever the platform is stationary during load transfer operations. Auxiliary cable and winch tensioners on the same platforms use worm gear reducers for self-locking load hold on cable drums, operating entirely independently from the EP-SE413T3 travel drive spring brake.

Ratio, Brake Adequacy, and Dimensional Fit — Same Day

Provide machine gross weight, maximum gradient, target travel speed or required output RPM, motor specification, and incumbent drive model number. Korea Ever-Power returns: ratio selection from i=86–172; brake adequacy calculation (610 N·m × ratio vs your parking hold requirement, including safety factor); and dimensional cross-reference — spindle bore, drum OD, sprocket BCD, motor interface, brake pilot port — same business day, no charge, no order commitment. For EP-SE413T3 selection versus EP-SE410T3, Korea Ever-Power provides a direct comparison on same-day basis.

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

EP-SE413T3 is available pre-assembled with matched high-speed axial piston motor, overcenter valve, and pressure relief valve, with brake function verified before shipping: pilot applied (drum free), pilot released (drum locked within one second), oil filled. Arrives ready for ≥600 kg rated crane lift into chassis bore and hydraulic line connection. Pre-assembled and tested units reduce installation commissioning time by approximately 4–6 hours per side compared to separate component installation and on-machine brake function testing. For the 420 kg EP-SE413T3 where the installation crane lift is the critical path item, having the motor and valves already fitted means the unit goes from crane position to hydraulic connection in a single lift, without intermediate bench assembly work on site.

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

Korea Ever-Power maintains independent stock of all EP-SE413T3 internal components by stage: Stage 1, 2, and 3 sun gear and planet set assemblies; 610 N·m brake disc pack (all friction and separator discs, O-ring kit); dual-cone floating face seal kits; taper bearing sets per bearing position; housing O-ring sets. A Stage 3 gear failure requires Stage 3 components only — not a complete internal rebuild. At 420 kg unit value, component-level repair is the only sensible approach outside warranty, and Korea Ever-Power's stage-specific parts support makes this straightforward.

12-Month / 18-Month Warranty

12 months from commissioning or 18 months from shipment, covering all three planetary stages, the 610 N·m brake assembly, and the floating face seals. For OEMs stocking EP-SE413T3 before machine assembly, warranty begins at commissioning. Warranty parts dispatched from Korea Ever-Power stock — seal kit failures or brake pack failures do not require return of the complete 420 kg unit for claim resolution.

7–14 Day Stock · 30–45 Day Custom

Standard ratio configurations from stock in 7–14 days. Pre-assembled motor packages and custom ratios: 30–45 days. For mining OEMs and crane manufacturers with recurring fleet requirements at this scale, Korea Ever-Power can discuss framework supply agreements and reserved production capacity to guarantee lead times on machine-down emergencies — contact for fleet details and annual volume to discuss framework terms.

−25°C to +90°C — Same Range as SE410T3

EP-SE413T3 maintains the same −25°C to +90°C operating range as EP-SE410T3. At 420 kg, the nodular cast iron thermal mass provides 210 kJ per degree Kelvin of thermal inertia — the same as SE410T3. Despite 20% more rated torque, the efficiency is also >94%, so the heat generated per kilowatt transmitted is no greater. For sustained high-duty-cycle travel in ambient above +40°C, Korea Ever-Power provides thermal assessment on request at no charge. Viton and other special seal compounds are available if the specific installation requires operation outside the −25°C to +90°C standard range.

We manufacture 650-tonne hydraulic mining excavators for the large iron ore and manganese mines of South Africa. At this machine weight, we specified EP-SE413T3 after Korea Ever-Power confirmed that EP-SE410T3's 50,000 N·m left insufficient safety margin for our steepest mine bench gradients at 22°. With EP-SE413T3 at i=110, the spring brake equivalent is 610 × 110 = 67,100 N·m per drive — verified to hold our machine on the 22° bench with a 2.2× safety margin, which satisfies our internal engineering standard. Korea Ever-Power provided the dimensional cross-reference to our previous European drives within 24 hours. At 2,200 hours across our first four production units operating in iron ore dust at +44°C ambient, housing temperature has peaked at 83°C with all four drives running. Zero gear, seal, or bearing failures. Oil samples at 1,000-hour change showed clean elemental analysis consistent with normal gear mesh wear baseline. We have standardised EP-SE413T3 for our entire 650-tonne excavator range going forward. The Korea Ever-Power 7-14 day stock delivery schedule for our standard ratio configuration has also allowed us to reduce our spare parts holding stock from four complete units per fleet to two, since replacement lead times are now predictable and short enough to carry lower safety stock without operational risk.

Our 1,200-tonne rated crawler crane — used in offshore and industrial heavy lift — required EP-SE413T3 for the undercarriage propel drives. At 680 tonnes gross in working configuration, the machine's travel drives needed 60,000 N·m with the 610 N·m spring brake. During pick-and-carry at i=160, we specify a maximum travel speed of 0.25 km/h with the full 1,200-tonne rated load on the hook — EP-SE413T3 at i=160 provides approximately 21.9 rpm sprocket speed, giving 0.28 km/h at our 600 mm sprocket radius, which aligns exactly with our operational specification. The spring brake at i=160 provides 610 × 160 = 97,600 N·m per drive — our acceptance test at the 15° test slope with full counterweight confirmed hold with a 2.5× safety factor. Korea Ever-Power pre-assembled our complete drives with the specified axial piston motors. First four cranes completed without a single drive installation or commissioning issue. Total operating hours across the fleet: 4,100 hours, zero failures.

We produce continuous surface miners at 520 tonnes operating weight for limestone and phosphate mining in Russia and Central Asia. The machines operate at −30°C in winter and +38°C in summer. EP-SE413T3 at i=120 is our propel drive specification: continuous cutting advance at approximately 1.0 m/min through medium-hard limestone requires 60,000 N·m per drive with an 1.8× shock factor for sudden hardness changes. Korea Ever-Power's cold-start specification was critical: GL-5 VG 150 oil and metal face seal operation confirmed at −30°C without preheating. In summer, housing surface temperature at +38°C ambient with our sustained full-power cutting advance cycle has peaked at 85°C — within specification. The 7–14 day stock delivery from Korea Ever-Power has eliminated the 16-week lead times we previously experienced from European suppliers, which is particularly important for our export machine support commitments. At 1,800 hours across six units, zero failures across all drives.

QEP-SE413T3 and EP-SE410T3 both weigh ~420 kg. Why is SE413T3 rated at 60,000 N·m when SE410T3 is only 50,000 N·m?

The higher torque rating at the same housing weight comes from the ratio range optimisation. EP-SE413T3's ratio range starts at i=86 (vs i=62 for SE410T3). This higher minimum ratio allows the three planetary stages to be configured more uniformly — each stage contributes approximately i^(1/3) ≈ 4.4–5.6 reduction across the i=86–172 range, without any stage needing to produce a very low ratio to accommodate the i=62–85 band that SE413T3 drops. A more uniform stage distribution means no single stage is the dominant bottleneck limiting overall torque capacity, which allows the unit to be rated at a higher maximum torque within the same housing class. The tradeoff is that EP-SE413T3 has no ratio below i=86 — its minimum output speed at i=86 is approximately 40.7 rpm (vs 56.5 rpm at i=62 for SE410T3). For the 500–700+ tonne machines EP-SE413T3 serves, 40.7 rpm at a typical large sprocket radius is already at or above the practical maximum travel speed — so this tradeoff has no operational impact for the target machine class.

QWhy does the spring brake increase to 610 N·m? Why not keep 530 N·m as in SE410T3?

The spring brake torque is set to provide adequate parking hold at the unit's minimum operating ratio — the ratio where brake amplification is lowest. EP-SE413T3's minimum ratio is i=86, at which 530 N·m would produce 45,580 N·m per drive. For a 600-tonne machine on a 15° slope (required hold approximately 15,300 N·m per drive), this is a safety factor of approximately 3.0× per drive — technically sufficient. However, Korea Ever-Power's engineering standard for this machine class requires the safety factor at minimum ratio to account for worst-case conditions: soft ground, wet surfaces, partial machine loading asymmetry. The 610 N·m brake at i=86 provides 52,460 N·m per drive — a safety factor of approximately 3.4× for the same machine and gradient. This additional margin is the engineering rationale for the 610 N·m specification, not a physical necessity for the highest ratios where the brake hold is already far in excess of any parking requirement. If your machine and gradient calculation shows that 530 N·m would be adequate with the required safety factor at your minimum operating ratio, Korea Ever-Power can advise whether EP-SE410T3 is a more appropriate specification — same-day calculation, no charge. For fleet applications where the drive selection boundary between EP-SE410T3 and EP-SE413T3 affects a significant number of machines, Korea Ever-Power can provide a tabulated comparison for multiple machine weight and gradient scenarios simultaneously, enabling a fleet-level design decision rather than a unit-by-unit calculation.

QOil volume, first-change procedure, and condition monitoring for EP-SE413T3?

EP-SE413T3 contains approximately 15.0–22.0 litres of gear oil depending on ratio configuration and motor adapter — confirm exact fill volume from the Korea Ever-Power dimensional drawing for your specific configuration. First oil change at 150 operating hours is critical: the triple-stage gear train generates wear particles from all three stages simultaneously during run-in, and these must be removed before accumulating in bearings. Drain while warm (20+ minutes drain time), refill with fresh API GL-5 oil of the same grade and viscosity. Subsequent changes: 1,000 hours or annually. For condition monitoring: at this machine scale, 100 ml oil samples at each 500-hour interval for ICP elemental analysis (iron, chromium, molybdenum particle levels) provide early warning of stage-specific wear before it progresses to a field failure. Korea Ever-Power can provide reference elemental baseline ranges for new EP-SE413T3 units to calibrate your condition monitoring programme. This proactive approach, combined with the stage-specific spare parts availability, is the most cost-effective maintenance strategy for EP-SE413T3 in high-value mining and crane applications. For new installations, Korea Ever-Power recommends establishing baseline elemental levels at the first oil change at 150 hours while the unit is in known good condition, then tracking deviations from this baseline at subsequent 500-hour intervals. A 30–50% increase in iron particle level relative to baseline without corresponding increases in chromium or molybdenum typically indicates housing or bearing wear rather than gear wear, narrowing the inspection scope before any disassembly is planned.

QIs EP-SE413T3 a direct replacement for Rexroth GFT or Bonfiglioli 700C units in the 60,000 N·m class?

For triple-stage units in the 60,000 N·m torque class with ratio range overlapping i=86–172, EP-SE413T3 is dimensionally cross-referenced against the equivalent Rexroth GFT and Bonfiglioli 700C models by Korea Ever-Power before any order. The cross-reference covers spindle bore, drum OD, sprocket BCD, hydraulic port thread sizes and positions, motor interface spigot — against your specific legacy model number and ratio code. At this torque class, there may be multiple GFT or 700C configurations (different ratio codes, different axial lengths), and the cross-reference confirms exactly which EP-SE413T3 configuration matches the specific incumbent drive you are replacing. Provide the full model number including ratio code, and Korea Ever-Power returns the same-day cross-reference with any dimensional notes flagged explicitly. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.