Overview
The ZF 4657.056.127 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully integrated, factory-assembled gearbox core designed for heavy-duty off-highway machinery. This complete unit replaces the entire rotating assembly and clutch pack system within the WG 210 series, serving as the central power transfer module between the engine and driveline. The SKU 4657.056.127 denotes a remanufactured or new-build assembly that includes the main shaft, planetary gear sets, and hydraulic control components. It sits directly between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, providing the structural foundation for torque multiplication and gear ratio changes in loaders, dozers, and industrial forklifts.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the complete unit wears, internal clutch discs lose friction, causing the transmission to hesitate or slip during acceleration, especially in forward gears.
- Low hydraulic pressure and delayed shifts: A failing assembly often results in insufficient pump pressure, leading to long shift delays or a complete loss of drive in certain ranges.
- Metallic debris in the oil pan: Worn bearings or planetary gears shed metal particles, which can be detected during routine oil changes and indicate imminent internal failure.
- Oil leaks at the housing interface: Cracks or warping in the main assembly allow transmission fluid to escape past the HOUSING REAR PART or HOUSING REAR SECTION seals, causing visible drips and low fluid levels.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.056.127 |
| Assembly Type | Complete Powershift Unit (6-speed) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | Cast Iron (GGG-40) |
| OEM Reference | ZF 6 WG 210 |
| Max Input Torque | 2,100 Nm |
| Bolt Torque Spec | 120 Nm (M12 cap screws) |
Compatibility
This complete unit is specifically engineered for the ZF WG 210 series, but it also fits select models in the WG 180 and WG 200 families due to shared planetary carrier dimensions. It is a direct replacement for transmissions in ZF 6WG-210, 6WG-200, and 6WG-180 configurations used in construction equipment from manufacturers like Liebherr, Caterpillar, and Volvo. Always verify the housing casting number against your TRANSMISSION HOUSING to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101080 | TRANSMISSION HOUSING | Main structural casing for the assembly |
| 4657201167 | HOUS.FRONT SECT | Front section housing for input shaft |
| 4657201171 | HOUSING REAR PART | Rear cover for output shaft support |
| 4657298103 | HOUSING REAR SECTION | Extended rear housing for PTO mount |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M12 bolt for housing fastening |
| 4656301148 | FIXING PLATE | Locking plate for bearing retention |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh filter for debris protection |
| 0636100803 | CAP SCREW | M10 bolt for accessory mounting |
