Overview
The ZF 4657.066.008 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready solution for heavy-duty off-highway machinery. This complete unit integrates the clutch pack, planetary gear sets, and hydraulic control system into a single, pre-tested assembly. Designed for the WG 211 series, it replaces worn or failed transmissions in wheel loaders, dozers, and material handlers. The SKU 4657.066.008 is the direct OEM reference for this complete unit, ensuring a precise fit without modification. It sits as the central power transfer component between the engine and the driveline, managing torque distribution across all forward and reverse gears.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the complete unit wears, internal clutch packs lose clamping force, causing the machine to hesitate or slip when shifting into forward or reverse under heavy load.
- External oil leaks at the housing seams: Fatigue in the main housing or seal interfaces leads to visible hydraulic oil weeping, particularly around the bell housing and rear output flange.
- Delayed or harsh shifting between ranges: A failing 4657120005: PRESSURE REGULATOR inside the assembly can cause pressure spikes or drops, resulting in jarring shifts or a noticeable lag before gear engagement.
- Unusual whining or grinding noise from the transmission: Worn bearings or damaged planetary gears produce a metallic grinding sound that intensifies with engine RPM, indicating internal component failure.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.066.008 |
| Assembly Type | Complete Powershift Transmission Unit |
| Dry Weight | Approx. 340 kg (750 lbs) |
| Overall Length | 820 mm |
| Overall Width | 510 mm |
| Overall Height | 590 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 2,100 Nm |
| Number of Speeds | 6 forward / 3 reverse |
| OEM Reference | ZF 6 WG 211 |
Compatibility
This complete unit is engineered for the ZF WG 211 series, but it also serves as a direct replacement for earlier WG 180 and WG 200 models when used with the appropriate adapter kit. It is commonly installed in ZF 6 WG 211, 6 WG 180, and 6 WG 200 transmissions found in articulated dump trucks, wheel loaders, and graders. For optimal performance, pair this assembly with a new 0501211384: VALVE to ensure precise hydraulic flow, and inspect the 0630532183: INDENTED RING for wear on the output shaft. Additionally, the 4656306145: PISTON inside the clutch pack should be replaced simultaneously to prevent future pressure loss.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | Pressure Regulator | Controls hydraulic pressure to clutch packs |
| 0501211384 | Valve | Directs oil flow for gear selection |
| 0630532183 | Indented Ring | Locks output shaft components |
| 4656306145 | Piston | Engages clutch discs hydraulically |
| 0732042767 | Compression Spring | Returns piston to neutral position |
| 0631612064 | Set Screw | Secures valve body alignment |
| 0631610026 | Set Screw | Locks adjustment points |
| 4657101049 | Transmission Housing | Main structural casing |
| 4657301130 | Housing Front Section | Front bell housing adapter |
| 4657301131 | Housing Rear Part | Rear output flange housing |
