EP-SE417T3 Triple-Stage Track Drive Planetary Gearbox

The EP-SE417T3 is a triple-stage track drive planetary gearbox producing 220,000 N·m from a 3,000 rpm motor input, across a ratio range of i=123–365. Its rotating outer housing carries the track sprocket directly on the drum flange. At 1,450 kg, it is the heaviest single unit in the SE series on this site, requiring ≥2,500 kg certified crane lift for installation.

The required tractive force scales approximately proportionally with machine weight. A 4,000-tonne machine on a 10° ramp requires approximately 4,000 × 9.81 × sin10° ÷ 2 drives ÷ 0.65 m sprocket = 538,000 N per drive tractive force. At a 750 mm sprocket radius: 538,000 × 0.75 = 403,500 N·m per drive before dynamic shock factor. With a 1.5× shock factor for large rope shovel tramming: 605,000 N·m per drive — well above EP-SE415T3's 110,000 N·m, requiring EP-SE417T3's 220,000 N·m with significant remaining safety margin. The machine class jump from 1,000–2,000 t (EP-SE415T3) to 2,000–5,000+ t (EP-SE417T3) directly produces the 100% torque increase in the drive specification, as tractive force scales with weight.

EP-SE417T3's 2,000 N·m brake is 67% higher than EP-SE415T3's 1,200 N·m — not 100% higher. The reason the brake does not need to double proportionally with torque is that i=365 (the maximum ratio for EP-SE417T3) is 70% higher than EP-SE415T3's i=215. At i=365, the 2,000 N·m brake produces 730,000 N·m effective output-side hold — 2.83× higher than EP-SE415T3's maximum of 258,000 N·m. The ratio increase more than compensates for the lower-than-proportional brake torque increase. Machines at the 2,000–5,000 tonne class that use EP-SE417T3 at high ratios (i=250–365) receive far more brake amplification than machines using EP-SE415T3 at i=200, even though the spring brake in absolute terms is only 67% larger.

EP-SE417T3's minimum ratio starts at i=123 — substantially higher than EP-SE415T3's i=81. At i=123, the output speed is approximately 24.4 rpm. At a 750 mm sprocket radius, this produces approximately 1.1 km/h maximum travel speed. The 2,000–5,000 tonne machines served by EP-SE417T3 do not travel faster than 1.0–1.5 km/h under any circumstances — the i=123 minimum ratio already represents the practical upper travel speed limit for this machine class. Starting the ratio range at i=123 rather than a lower value means all three stages can be configured to optimise for the i=123–365 operational range, with no wasted design effort on a fast-travel ratio band that the machine would never use. This contributes to the torque density achievable within the 1,450 kg housing.

i=365 is the highest ratio in the full SE series as covered on this site. At 3,000 rpm motor input, i=365 produces approximately 8.22 rpm sprocket output — 46% slower than EP-SE415T3's slowest output (13.95 rpm at i=215). The following numbers illustrate the engineering significance of this ratio for brake adequacy.

Super-Large Walking Draglines and Mining Shovels

The very largest walking draglines — machines with boom lengths exceeding 100 metres and bucket payloads of 120+ cubic metres, with total operating weights of 5,000–7,000 tonnes — include crawler-based propulsion systems at the upper end of the product range. For these machines, EP-SE417T3 at i=200–280 provides the propel drive capability needed to move the machine between panels on a mine bench. The 2,000 N·m spring brake at i=220 provides 440,000 N·m per drive mechanical hold — the emergency position hold when hydraulic pressure is lost during a tram on an uneven mine bench. For these machines, the spring brake is also the position hold during active digging cycles when the propel hydraulic circuit is de-pressurised between repositioning moves: the machine must not drift on the bench under gravity while the dipper is in the dig face. At 440,000 N·m per drive mechanical hold at i=220, the spring brake satisfies this requirement for machines up to several thousand tonnes on typical bench gradients of 5–12° without supplementary counterbalance valves. At 220,000 N·m rated drive torque, EP-SE417T3 handles the tractive force demands of these extreme machines at their steepest operational gradients with required safety margin.

Large Tunnel Boring Machine Main Drive and Propel Systems

Very large TBMs in the 18–22 metre bore diameter class — used for the largest highway and subway tunnels and large hydroelectric water tunnels — may use EP-SE417T3 for individual propel ring units where higher thrust per unit is required than EP-SE415T3 can provide. These TBMs generate total thrust forces of 100,000–200,000+ kN, distributed across many propel drives. Where individual propel unit load analysis requires above 110,000 N·m per unit, EP-SE417T3 at i=155–200 provides the required thrust with adequate safety margin. At 8–15 rpm output, the propel speed matches the cutting face advance rate for large TBMs in hard rock.

Largest Crawler Cranes — 2,000+ Tonne Lift Class

Crawler cranes with lift capacities above 2,000 tonnes — the very largest machines built for nuclear power plant reactor lifts, offshore jacket installation with 3,000+ tonne jacket weights, and large bridge girder placement — may have gross vehicle weights exceeding 1,500 tonnes in full counterweighted configuration. EP-SE417T3 serves the travel drives for these machines where machine weight at their steepest site gradients requires more than EP-SE415T3's 110,000 N·m per drive. The 2,000 N·m brake at i=180–250 provides the emergency position hold required by international crane safety standards for machines carrying loads exceeding 2,000 tonnes.

Offshore and Marine Ultra-Heavy Crawler Systems

The largest tracked transport platforms operating in marine and offshore environments — floating drydock transport systems, large subsea pipeline bundle deployment systems, and ultra-heavy yard transport platforms for FPSO module positioning — require EP-SE417T3 when total transported weight exceeds the capacity of EP-SE415T3 drives. These systems operate in salt water immersion, high-pressure wash environments, and corrosive coastal atmospheres. EP-SE417T3's dual-cone floating metal face seals sustain these conditions. Auxiliary cable winch and tensioner systems on these platforms use worm gear reducers for self-locking load hold on cable drums.

Super-Heavy Surface Miner and Mining Machine Systems

Very large continuous surface miners at the upper end of the production class — machines above 1,500 tonnes cutting very hard rock formations at high production rates — require EP-SE417T3 for the track propel drives when machine weight combined with the cutting drum resistance forces produce tractive force demands exceeding EP-SE415T3's capability. At i=165–215, the surface miner advance speed of 5–10 rpm matches the cutting drum penetration rate for the hardest igneous formations. The 220,000 N·m drive torque provides the continuous tractive force needed for 100% duty cycle cutting advance in very hard rock.

Ultra-Heavy Land Development and Infrastructure Platforms

The very largest tracked land reclamation and infrastructure development platforms — machines used in major dam and reservoir construction, large-scale coastal land reclamation, and major port infrastructure development — may exceed the 2,000-tonne class when carrying all implements and consumables for remote site operations. EP-SE417T3 provides the travel drives when machine weight requires 220,000 N·m per drive. Auxiliary ground engagement tools and multi-output implement drives on these platforms use agricultural multi-output gearboxes on separate PTO circuits, independent of the EP-SE417T3 travel drives.

Motor Selection, Ratio, Brake — Confirmed Same Day

EP-SE417T3's 3,000 rpm maximum applies here as with EP-SE415T3, and the motor displacement must be sized accordingly. Korea Ever-Power's same-day engineering response for EP-SE417T3 covers: motor displacement for your hydraulic circuit power at 3,000 rpm maximum; ratio from i=123–365 for your target travel speed; 2,000 N·m brake adequacy calculation including whether supplementary counterbalance valves are required for your machine weight and maximum gradient; and dimensional cross-reference against your incumbent drive. Provided in a single document, no charge, before any order commitment.

Pre-Assembled and Brake-Verified at 1,450 kg

Korea Ever-Power provides EP-SE417T3 pre-assembled with matched large-displacement motor, overcenter valve, and pressure relief valve. The 2,000 N·m brake is function-verified before shipping — spring applied (drum locked), pilot applied at 15–30 bar (drum free within 1 second), oil filled. At 1,450 kg, on-machine brake commissioning with a 2,500 kg+ crane holding the unit would be operationally complex and time-critical. Korea Ever-Power's pre-shipment verification eliminates this risk entirely. The unit arrives ready for single crane lift and hydraulic line connection.

Stage-Level Parts — 1,450 kg Serviced, Not Replaced

Korea Ever-Power stocks all EP-SE417T3 internal components by stage: Stage 1, 2, and 3 sun gear and planet set assemblies; 2,000 N·m brake disc pack (complete with friction discs, separator plates, Belleville springs, O-ring kit); dual-cone floating face seal kits; taper bearing sets per bearing position; housing O-ring kits. At 1,450 kg, a complete 220,000 N·m track drive planetary gearbox replacement involves a 50–100 tonne crane and substantial site logistics. Component-level repair — replacing only the failed stage — is the only practical approach at this unit scale. Korea Ever-Power's stage-separated parts availability makes this feasible without returning the unit to factory. For a 220,000 N·m track drive planetary gearbox at 1,450 kg, establishing a pre-positioned spare parts set at the machine site or nearby workshop — including at minimum a seal kit, brake disc pack, and the most likely bearing set — eliminates the sourcing delay for any component that could need replacement within the warranty or extended service period.

12/18-Month Warranty — 2,000 N·m Brake Included

12 months from commissioning or 18 months from shipment, covering all three planetary stages, the 2,000 N·m brake assembly in full, and the floating face seals. For OEMs stocking EP-SE417T3 before machine assembly, warranty begins at commissioning. Warranty component replacement dispatched from Korea Ever-Power stock — no requirement to return the 1,450 kg unit to factory for component-level warranty claims.

Stock and Framework Supply at This Scale

Standard ratio configurations from Korea Ever-Power stock in 7–14 days. Pre-assembled motor packages: 30–45 days. At 1,450 kg and this torque class, an unplanned drive failure in a 3,000-tonne rope shovel or 18-metre TBM represents catastrophic production loss. Korea Ever-Power discusses framework supply terms, reserved production capacity, and consignment arrangements for the largest fleets at this scale. Contact with machine fleet details and annual volume for framework pricing and emergency response planning.

−25°C to +90°C — 1,450 kg Thermal Mass

EP-SE417T3 maintains the −25°C to +90°C operating range. At 1,450 kg nodular iron, the thermal mass is approximately 1,450 × 500 J/(kg·K) = 725 kJ per degree — the highest in the SE series on this site, giving the longest thermal run-up time and greatest resistance to temperature spikes. At >93% efficiency with 220,000 N·m capability, heat generated per kilowatt at full load is the same as EP-SE415T3 per unit power — but at larger absolute scale. Korea Ever-Power provides thermal assessment for high-ambient and high-duty-cycle applications on request, at no charge. At 725 kJ per degree Kelvin thermal mass, the 1,450 kg housing absorbs heat generated during sustained travel duty cycles far more slowly than any lighter SE unit, providing a natural buffer against temperature peaks during intermittent high-load operation. Viton and low-temperature seal compounds are available as factory options for operation outside the standard −25°C to +90°C range.

We manufacture rope shovel propel systems for 3,500-tonne operating weight machines used in large copper and iron ore mines. Korea Ever-Power confirmed EP-SE417T3 at i=190 after calculating that at our steepest access ramp of 9° with 3,500 tonnes gross weight, the drive torque per unit with a 1.6× factor was approximately 175,000 N·m — requiring EP-SE417T3's 220,000 N·m for a 26% safety margin that our engineering specification requires. At i=190, the 2,000 N·m spring brake provides 380,000 N·m per drive mechanical hold — our type-approval requires 2.0× the maximum tramming torque from spring brake alone: at 380,000 N·m vs 175,000 N·m we achieve 2.17× per drive. Korea Ever-Power's pre-order engineering document was accepted by our certification body. The 1,450 kg installation required our site's 80-tonne crane — Korea Ever-Power provided the precise lifting attachment positions in the dimensional drawing. At 1,600 hours across six units in iron ore operation, zero EP-SE417T3 failures.

We supply main drive propel systems for large TBMs in the 17–21 metre bore diameter class. Our most recent 20-metre metro tunnel TBM uses 40 EP-SE417T3 units in the propel ring. The rock load analysis for our quartzite geology required 190,000 N·m per unit with a 1.15× load factor in the hardest sections — exceeding EP-SE415T3's 110,000 N·m and requiring EP-SE417T3. Korea Ever-Power specified i=162 for our advance rate target of 18.5 rpm at 3,000 rpm motor input. The 2,000 N·m brake at i=162 provides 324,000 N·m per unit hold — our TBM safety system requires immediate hold on pressure loss, and 324,000 N·m per unit with 40 drives gives enormous combined hold capacity. All 40 units installed without issues. At 1,850 hours through 4.2 km of tunnel (including mixed ground and fault zones), zero EP-SE417T3 failures. Korea Ever-Power's 7-14 day stock availability has been critical for our project schedule — we keep four units in reserve at the tunnel portal.

We operate specialised tracked sea-floor transport platforms for offshore infrastructure installation at water depths of 30–80 metres. Our largest platform system carries subsea manifold assemblies and pipeline end terminations weighing up to 2,400 tonnes combined system weight. Korea Ever-Power specified EP-SE417T3 at i=280 for our 12 propel drives. At i=280, the 2,000 N·m brake provides 560,000 N·m hold per unit — adequate for our maximum operational gradient of 4° on the seabed terrain with our largest payload. The dual-cone floating metal face seals have sustained continuous seawater immersion at depths of 45 metres without any seal failure or oil contamination in 2,300 hours of sea-floor operation across three project deployments. The 220,000 N·m capacity allows us to handle the highest-resistance seabed conditions (dense clay over rock bands) that occasionally exceed our EP-SE415T3 fleet's capability. Korea Ever-Power's same-day dimensional confirmation service was essential for our very tight project schedule on the first deployment — we had the technical documentation needed for our client's marine certification within 24 hours of enquiry.

ПEP-SE417T3 doubles the torque of EP-SE415T3 — what does this mean for the installation crane and site logistics?

EP-SE417T3 weighs approximately 1,450 kg — 600 kg (71%) more than EP-SE415T3's 850 kg. A 1,450 kg unit requires a certified crane rated at ≥2,500 kg, accounting for the safety factor on the crane rating. In practice, this typically means a 50–100 tonne telescopic crane or large industrial overhead crane at a manufacturing facility. Korea Ever-Power's dimensional drawing specifies the chain-attachment points on the drum housing for balanced lifting, and the unit hang angle for alignment into the spindle bore. Typical installation time with appropriate equipment is 14–16 hours per side with two experienced technicians. The installation complexity is the primary reason Korea Ever-Power strongly recommends pre-assembled and brake-verified units for EP-SE417T3 — having the motor and valves already fitted means the unit arrives as a complete, tested assembly and requires only a single crane lift and hydraulic line connection at the machine.

ПThe spring brake is 2,000 N·m. Does this provide adequate parking hold for a 3,000-tonne machine on a steep gradient?

For very large machines (above approximately 1,500 tonnes) on steep gradients (above approximately 10°), the 2,000 N·m spring brake alone may not provide the full required parking hold at minimum operating ratios. At i=123 (minimum ratio), the brake equivalent is 2,000 × 123 = 246,000 N·m per drive — holding approximately 258 tonnes at 15° per drive, or 516 tonnes combined. For a 3,000-tonne machine on a 10° gradient, the rolling force (combined both drives) is approximately 3,000,000 × 9.81 × sin10° = 5,107,000 N, requiring approximately 3,830,000 N·m combined torque at 750 mm radius. The spring brakes alone at i=123 provide 492,000 N·m — well short for this scenario. However, in actual operation, EP-SE417T3 would be specified at a high ratio (i=200–280) for most machine weights at this size, where brake equivalent is 400,000–560,000 N·m per drive. Additionally, the hydraulic motor circuit's counterbalance valves provide additional hold that acts in series with the spring brake. Korea Ever-Power calculates the combined spring brake plus counterbalance valve hold for your specific machine weight, ratio, and gradient, and advises whether the spring brake alone is adequate or counterbalance valve specification is required — same day, no charge. For machines at the boundary between spring-brake-only and combined-brake-valve adequacy, Korea Ever-Power provides the calculation for both conditions simultaneously, so the machine designer can determine whether a higher operating ratio within the i=123–365 range resolves the issue without adding counterbalance valve complexity to the hydraulic circuit.

ПOil volume, first-change procedure, and condition monitoring for the 1,450 kg triple-stage unit?

EP-SE417T3 contains approximately 40–55 litres of gear oil depending on ratio configuration and motor adapter — the highest oil volume in the SE series as presented here. The exact fill volume is on the Korea Ever-Power dimensional drawing for your specific configuration. First oil change at 150 operating hours: drain fully warm — with 40–55 litres, allow 30+ minutes complete drain time to evacuate all three stages' run-in particles. Refill with fresh API GL-5 VG 150 (below +15°C) or VG 220 (above +15°C). Subsequent changes: every 1,000 hours or annually. At this scale and unit value, ICP oil sampling at each 500-hour interval is strongly recommended. The large 40–55 litre oil reservoir means a small volume increase in elemental particle count can indicate a large absolute quantity of wear material — reference baseline elemental levels must be established at the 150-hour first change while the unit is new and known good. Korea Ever-Power provides reference elemental baseline ranges for EP-SE417T3 units in the startup documentation package. With 40–55 litres of oil, the drain and refill time at the first change and subsequent changes should be planned as a standalone maintenance activity requiring 1.5–2.0 hours per unit for the drain-warm-refill cycle alone, not including the crane time if the unit must be repositioned for port access. Korea Ever-Power’s dimensional drawing shows the port locations relative to the chassis bore orientation, allowing the maintenance team to confirm port access before scheduling the first-change maintenance window.

ПIs EP-SE417T3 a direct replacement for Rexroth GFT or Bonfiglioli 700C units in the 220,000 N·m class?

For triple-stage units in the 220,000 N·m torque class with ratio range overlapping i=123–365, Korea Ever-Power provides a full dimensional cross-reference before any order — spindle bore diameter and fit class, drum OD, sprocket BCD, hydraulic port thread sizes and positions, motor interface spigot, brake pilot port — against your specific legacy model number and full suffix code. At 220,000 N·m, the Rexroth GFT and Bonfiglioli 700C families have specialised high-torque configurations, and the cross-reference confirms which EP-SE417T3 configuration matches the specific unit being replaced. Any dimension that does not match is flagged with a resolution path. Provide the full model number with all suffix codes for the most accurate same-day cross-reference. Rexroth and Bonfiglioli are trademarks of their respective owners, cited for dimensional reference only.