605L2 Planetary Wheel Drive Gearbox Reducer

The EP-605L2 sits at the transition point in the planetary wheel drive gearbox range where torque capacity crosses from light-duty into serious industrial territory. At 7,000 Nm output, this wheel drive handles machines that move earth, lift steel, and push aircraft — work that demands not just raw torque but the right ratio to deliver it efficiently across a wide operating speed range.

What sets the 605L2 apart within the catalogue is the five-ratio spread from 22 to 53. That 2.4:1 ratio range means a machine equipped with the 605L2 at ratio 22 travels at more than double the ground speed of the same machine at ratio 53, while the torque at the tyre contact patch remains constant at 7,000 Nm. For OEM engineers designing hydrostatic drive systems, this spread is wide enough to select a single fixed-displacement motor that covers both the high-speed roading requirement and the low-speed earthmoving requirement — eliminating the cost and complexity of a two-speed motor with shift valving.

Wheel Loaders (8-12 Tonne Class)

The core application for the 605L2. Mid-size wheel loaders spend their working life alternating between low-speed bucket filling on a stockpile (ratio 42 or 53) and higher-speed loaded travel to the dump truck (ratio 27 or 30). The 605L2 five-ratio range eliminates the need for a two-speed motor or a powershift gearbox to cover both operating modes. Paired with a 50-63 cc/rev variable-displacement motor, the ratio choice locks in the optimal speed-torque point for the machine primary duty cycle.

Rough-Terrain Mobile Cranes (Wheeled)

Wheeled cranes with 10-25 tonne lifting capacity that must travel between lift sites on public roads and then creep into position on construction sites. The 605L2 at ratio 22 achieves road-legal travel speeds, while ratio 42 or 53 provides the controlled creep speed needed for precise crane positioning under load. The integral 220-310 Nm parking brake holds the crane on grades during outrigger setup without relying on the slewing drive brake for vehicle stability.

Airport Pushback Tractors and Ground Support

Towbarless pushback tractors for narrow-body and regional aircraft generate 5,000-7,000 Nm of sustained wheel torque during pushback operations, where the tractor must overcome the rolling resistance of both its own weight and the aircraft nosewheel assembly. The 605L2 at ratio 30 balances pushback speed (under 5 km/h for safety) with the traction force needed to move a 40-tonne aircraft on a wet apron. The declutch allows the tractor to be towed clear if it breaks down on an active taxiway.

Why does the 605L2 offer two brake torque values (220 Nm and 310 Nm)?

The 220 Nm brake uses a smaller-diameter disc that fits inside the standard housing cavity. The 310 Nm brake uses a larger disc in a widened brake pocket. Both are spring-applied and hydraulically released with the same piston diameter and release pressure. The 310 Nm option adds approximately 3 kg to the unit weight and is recommended for machines that regularly park on grades above 10% at full operating weight. When in doubt, specify the 310 Nm version — the cost difference is minimal and the larger brake disc also runs cooler during dynamic engagement events.

Can the 605L2 handle the shock loads from a wheel loader bucket striking a rock face?

Yes. The 7,000 Nm rated torque assumes continuous loading at that level. The peak torque capacity is approximately 2x rated (14,000 Nm) for transient events lasting under 1 second, which covers impact loading during aggressive bucket filling. The carburised alloy steel gears at HRC 58-62 are specifically designed for the repeated impact cycling that wheel loader duty imposes. If your application involves sustained shock loading (for example, a rock crusher feed vehicle), apply a service factor of 1.25-1.5 and verify the effective capacity still meets the tractive force requirement.

What makes a planetary wheel drive more suitable than a powershift transmission for loaders?

A powershift transmission (torque converter plus multi-speed gearbox) provides speed variation through gear shifting, but each shift event interrupts tractive effort for 200-500 ms and generates heat in the torque converter at low speeds. A hydrostatic wheel drive with the 605L2 provides continuously variable speed without shift interruptions, which is critical for loader bucket filling where the operator needs instant forward-to-reverse response. The hydrostatic system also provides infinitely variable speed control down to zero — a capability that powershift transmissions cannot match without a separate inching function.

How do I estimate the oil temperature rise in the 605L2 during continuous operation?

At 95% efficiency and 7,000 Nm output at 100 rpm output speed: input power = 7,000 x 100 x 2 x 3.14 / 60 / 0.95 = 77.2 kW. Heat generated = 77.2 x 0.05 = 3.86 kW per wheel drive. With an oil volume of approximately 2.5 litres and natural convection from the 135 kg housing, expect a temperature rise of 30-45 deg C above ambient under sustained full-load operation. If the calculated sump temperature (ambient + rise) exceeds 80 deg C, reduce the duty cycle or add a supplementary oil cooler circuit. Contact 한국 에버파워 for thermal modelling of specific operating profiles.

Is the 605L2 interchangeable with competitor wheel drives at the same torque class?

The output flange bolt pattern follows SAE/ISO standards, which means the 605L2 will bolt to most wheel rims designed for drives in the 6,000-8,000 Nm class. The input motor flange also follows SAE standards. However, the housing outside diameter, axial length, and brake release port location vary between manufacturers, so a direct drop-in replacement of a specific competitor model requires a dimensional verification. Provide the model number and drawing of the existing drive and we will confirm dimensional compatibility within 48 hours.

How does a wheel drive planetary gearbox handle reverse rotation?

Planetary gearboxes are mechanically symmetrical — they transmit torque equally in both rotation directions. Reversing the wheel direction is done by reversing the hydraulic motor (swapping the pump displacement to the opposite side on a closed-loop circuit, or switching directional valves on an open-loop circuit). The 605L2 gears, bearings, and seals experience identical loading in forward and reverse. There is no mechanical distinction between the two directions and no limit on the frequency of forward-reverse cycling, making the planetary wheel drive ideal for loader Y-cycle operations that reverse every 15-20 seconds.

We evaluated the 605L2 ratio 30 against two incumbent suppliers for our 10-tonne loader platform. Performance matched on the dynamometer. Where Ever-Power differentiated was on technical support during integration — they provided a complete hydraulic circuit schematic with valve sizing recommendations specific to our pump and motor combination, which none of the other suppliers offered without a paid engineering consultancy. The five ratios also gave us flexibility to offer a "quarry spec" variant (ratio 42) on the same base machine without any frame modification.

Pushback tractor for regional jet operations. Ratio 30 gives us the right balance between pushback torque and repositioning speed on the apron. The declutch feature was actually a specification requirement from our airport authority — any ground vehicle that could potentially block an active taxiway must be towable in under 60 seconds. The 605L2 declutch meets this. Oil changes every 6 months and brake inspection annually is all the maintenance we do. No issues in 19 months of operation.

Replacement wheel drive on a 15-tonne rough-terrain crane. The 605L2 ratio 22 is a direct mechanical swap for the OEM unit. Performance is indistinguishable from the original at roughly half the cost. The 4-star is because we needed the 310 Nm brake option and the first unit shipped with the 220 Nm version — an order processing error, not a product issue. The replacement arrived in 10 days and the 310 Nm brake does hold better on the 18% ramps at our precast yard. The unit itself is well-made.