610L2, L3 Planetary Wheel Drive Gearbox Reducer

30,000 Nm
Starting at Ratio 20.

That combination should not be possible in a 265 kg package. It is. The EP-610 L2 at ratio 20 pushes a 50-tonne ADT to highway speed while keeping the full 30,000 Nm available for the loaded climb back up the pit ramp — because the two-stage architecture achieves what a three-stage design geometrically cannot at this ratio.

A planetary stage produces its ratio through the tooth count relationship between the sun gear, the planet gears, and the ring gear. At low overall ratios, each stage must contribute a modest reduction — for a total ratio of 20 in two stages, each stage contributes approximately 4.5:1. This requires a sun gear large enough to mesh with the planets at high torque without tooth bending failure, which in turn demands a large ring gear diameter and a heavy housing.

The 610L2 solves this by using a housing diameter and gear module size that are oversized relative to the torque — the same housing that carries 30,000 Nm through two stages at ratio 20 could carry significantly more torque at ratio 40 because the tooth stress is lower at higher ratios. This is why the 610 weighs 265 kg: it is not heavy for its torque class — it is heavy for its ratio, because the low ratio demands large-diameter gears that a lighter housing cannot accommodate.

Lifting and Rigging

Minimum crane or hoist capacity: 500 kg (1.9x safety factor). Use the cast lifting eye-bolts only — never sling around the output shaft or motor flange. Lift horizontally to prevent the housing from pendulumming on the output shaft. On vehicle assembly lines, a purpose-built cradle with roller guides reduces installation time from 45 minutes (free-hanging crane) to 15 minutes (guided insertion).

Flange Alignment

The output flange must seat flat against the wheel mounting surface with no gap exceeding 0.05 mm at any point around the circumference. Use a feeler gauge at 4 equally spaced points before tightening any bolts. A cocked flange concentrates bolt load on one side, which causes bolt fatigue and eventual loosening. If the flange will not seat flat, inspect both the gearbox face and the vehicle mounting plate for burrs, paint build-up, or machining error.

Bolt Torque Sequence

Torque all wheel mounting bolts in a star pattern to 50% of final torque, then repeat the star pattern to 100%. Use a calibrated torque wrench — not an impact gun for the final pass. Re-torque after 50 operating hours. On the 610 frame, under-torqued bolts will work loose within 200 hours and over-torqued bolts will stretch and fatigue-crack within 2,000 hours. Both conditions lead to catastrophic wheel separation.

Hydraulic Connections

Connect the motor pressure lines, the case drain line, and the brake release line before filling the gearbox with oil. Flush the brake release circuit with clean oil before the first operation to remove any assembly debris. Verify brake engagement and release by cycling the brake release pressure 10 times before driving the machine. Contact Korea Ever-Power for the hydraulic connection torque specifications and recommended port fittings for your system pressure class.

Large ADTs (40-60 Tonne Payload)

Articulated dump trucks in the 40-60 tonne payload class road between pit and dump at 25-35 km/h, then climb 20-25% loaded haul roads at 8-12 km/h. The 610L2 at ratio 20-25 provides the highway speed, and the full 30,000 Nm handles the loaded grade without stalling the hydrostatic circuit. No other wheel drive in the catalogue can deliver both 30,000 Nm and 25+ km/h ground speed — the 609 starts at ratio 33 (too slow) and the 611 starts at ratio 41 (far too slow for roading).

Port Straddle Carriers

Container straddle carriers that pick up, transport, and stack 30-40 tonne containers within port terminals. These machines require 25,000-30,000 Nm per wheel for loaded acceleration on wet, polished terminal surfaces and must travel at 20-25 km/h between stack positions for productive container throughput. The 610L2 at ratio 20-30 matches this speed-torque envelope precisely. The slewing drive gearbox handles the spreader rotation on the same hydraulic platform.

Large Wheel Loaders (18-25 Tonne)

Production loaders with 4-6 m³ buckets in quarry and aggregate operations that fill 50-tonne dump trucks at high cycle rates. The 610L3 at ratio 50-80 provides the traction force for aggressive stockpile penetration, while the 5.6:1 ratio range within the 610 family means the OEM can offer both a quarry-spec (high traction, ratio 80) and a road-spec (fast travel, ratio 30) on the same chassis without any structural modification.

Why can the 610L2 achieve ratio 20 when other L2 models start at ratio 30 or higher?

The 610 uses a larger housing diameter than any other L2 model in the series. The increased ring gear diameter allows a larger sun gear, which reduces the per-tooth stress at low ratios. This is an engineering trade-off: the 265 kg weight and larger physical envelope are the cost of achieving ratio 20 at 30,000 Nm in only two stages. At smaller housing diameters (like the 606 or 607), the sun gear at ratio 20 would be too small to carry the tooth bending load at 30,000 Nm.

How does the 610 compare to the 611 (36,000 Nm) for a 50-tonne ADT?

The 611 delivers 20% more torque but starts at ratio 41 — which limits the maximum ground speed to approximately 16 km/h with a 750 mm tyre. If the ADT must road at 25+ km/h (most modern ADTs do), the 611 cannot achieve this speed regardless of motor selection. The 610 at ratio 20 reaches 35 km/h. For ADTs where roading speed is as important as grade-climbing ability, the 610 is the only viable choice at this torque level.

Can a planetary wheel drive at ratio 20 handle emergency braking at 35 km/h?

The gearbox itself handles any torque direction. During emergency braking, the hydrostatic circuit applies retarding torque through the motor, which the 610 transmits to the wheel identically to driving torque. The 800 Nm parking brake at ratio 20 produces 16,000 Nm of holding torque per wheel — this is a static holding brake only and must not be used for dynamic deceleration from speed. Dynamic braking at 35 km/h on a 50-tonne ADT requires properly sized counterbalance valves and crossover relief in the hydrostatic circuit, not the gearbox parking brake.

What crane or hoist is needed to install the 610 during vehicle assembly?

Minimum 500 kg capacity at the working radius. An overhead bridge crane or jib crane is ideal for production line assembly. For field replacement, a vehicle-mounted service crane (common on mining service trucks) or a portable 1-tonne chain hoist on a tripod frame is sufficient. The critical factor is not the lifting capacity but the positional accuracy — the 610 must be held within 2-3 mm of the mounting face while the technician aligns the bolt holes and starts the first two bolts. A guided cradle or locating pins dramatically simplify this step.

What is the oil volume and recommended change interval for the 610?

Approximately 5-7 litres depending on mounting angle and L2/L3 configuration. Use API GL-5 SAE 80W-90 for standard conditions or SAE 75W-90 full synthetic for cold-climate operations. First change at 250 hours. Subsequent changes every 1,500 hours in mining/quarry environments or 2,000 hours in port operations. Oil sampling every 500 hours is strongly recommended at this torque class — the cost of a quarterly oil sample is negligible compared to the cost of an undetected bearing failure on a machine that costs several hundred dollars per hour to operate.

How does the planetary wheel drive gearbox handle the torsional shock from an ADT crossing a berm?

Berm crossing generates a torsional impulse when the tyre suddenly contacts the berm face and decelerates the wheel while the motor inertia continues to drive the input shaft. The resulting torque spike can reach 2-3 times the rated continuous torque for 50-100 milliseconds. The 610 is designed for a peak-to-continuous ratio of approximately 2:1 (60,000 Nm peak), which covers normal berm impact events. For machines that routinely strike hard berms at speed, apply a service factor of 1.5 and verify that the effective continuous rating (30,000 / 1.5 = 20,000 Nm) still exceeds the RMS duty cycle torque.

45-tonne ADT platform, 610L2 ratio 22. We evaluated six wheel drive suppliers across two years of development. The 610 was the only unit in any catalogue that combined 30,000 Nm with a ratio low enough to road at 28 km/h. Every competitor started at ratio 30 or higher, which would have required a two-speed motor to hit our road speed target — adding cost, weight, complexity, and a shift mechanism that operators universally hate. The 610L2 eliminated all of that. One motor, one ratio, one gearbox, 28 km/h road, 22% grade loaded. Exactly what we specified.

Straddle carrier fleet, 12 units, 610L2 ratio 25. Container throughput on our terminal improved by 8% after switching to the 610 from the previous supplier. The improvement came from higher inter-stack travel speed (23 km/h vs 18 km/h) without any reduction in loaded traction on the wet dock surface. The installation was straightforward — the guided cradle tooling that Ever-Power provided reduced assembly time to 20 minutes per unit compared to the 50 minutes we were spending with the old crane-lift method.

22-tonne loader, 610L3 ratio 65. The machine has good pulling power into the stockpile and the drives have been running clean for 9 months. The 4-star is because one of the four units arrived with a slightly damaged breather valve cap — likely shipping damage, not a manufacturing issue. It was replaced under warranty in 3 days. My only other observation: the 265 kg weight means that when we needed a field replacement, we had to bring the service truck with the crane instead of doing it with a forklift and two people like we could with the old 180 kg drives. Not a complaint about the product, just a practical reality of working with heavier equipment.