Overview
The ZF 4657.066.004 6 WG 211 Powershift Transmission Assembly is a complete, remanufactured unit engineered for heavy-duty off-highway applications. This fully assembled transmission integrates the clutch packs, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As a core component of the WG 211 series, it manages torque distribution across six forward speeds, ensuring smooth power delivery under extreme loads. The SKU 4657.066.004 replaces worn-out assemblies, restoring original equipment performance in loaders, graders, and industrial vehicles.
Symptoms of Failure
- Erratic gear engagement or slipping: When the internal clutch packs or valve body wear, the transmission may hesitate or fail to hold gears under load, often accompanied by a burning smell.
- Hydraulic oil leaks from the housing: Deteriorated seals or a cracked TRANSMISSION HOUSING can cause fluid loss, leading to low pressure and erratic shifting.
- Delayed or harsh shifting: A failing PRESSURE REGULATOR or worn VALVE can disrupt hydraulic timing, resulting in jarring gear changes or prolonged neutral periods.
- Unusual noise during operation: Grinding or whining sounds often indicate damaged bearings or a misaligned PISTON within the clutch pack.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.066.004 |
| Series | WG 211 |
| Overall Length | ~780 mm |
| Dry Weight | ~195 kg (430 lbs) |
| Housing Material | Cast Iron (GGG-40) |
| Max Input Torque | 1,200 Nm |
| Number of Speeds | 6 Forward / 3 Reverse |
| Hydraulic Pressure Range | 18–22 bar |
| OEM Reference | ZF 6 WG 211 |
Compatibility
This complete unit is designed for the ZF WG 211 series, but it also fits select WG 180 and WG 200 models with identical bellhousing patterns and input spline configurations. It is commonly used in the 6 WG 211, 6 WG 180, and 6 WG 200 transmissions found in articulated dump trucks, wheel loaders, and telescopic handlers. Always verify the housing variant—the HOUS.FRONT SECT and HOUSING REAR PART must match your chassis mounting points.
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 | Secures piston within clutch drum |
| 4656306145 | PISTON | Applies clamping force to friction discs |
| 0732042767 | COMPRESSION SPRING | Returns piston to neutral position |
| 0631612064 | SET SCREW | Locks valve body adjustments |
| 0631610026 | SET SCREW | Secures pressure regulator housing |
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657301130 | HOUS.FRONT SECT | Front section containing input shaft |
| 4657301131 | HOUSING REAR PART | Rear section supporting output flange |
