Overview
The ZF 4657.066.007 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in-ready gearbox core designed for heavy-duty off-highway machinery. This complete unit integrates the planetary gear sets, clutch packs, and hydraulic control system into a single, pre-tested assembly. As the central power transfer component in the WG 211 series, it converts engine torque into controlled, multi-speed output for loaders, graders, and industrial tractors. The SKU 4657.066.007 identifies this as a factory-spec complete unit, ensuring precise alignment with OEM drivetrain requirements. When rebuilding, this assembly works in concert with the 4657120005 PRESSURE REGULATOR to maintain stable hydraulic pressure across all six forward speeds.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn internal clutches or a failing 0501211384 VALVE can cause a 2-3 second lag when shifting from neutral to drive, often accompanied by a jarring clunk.
- Progressive oil leaks at the bell housing: Degraded seals around the 0630532183 INDENTED RING allow ATF to weep externally, leaving visible puddles under the transmission after short operation.
- Torque loss under load: A slipping 4656306145 PISTON in the clutch pack reduces clamping force, causing the machine to lose pulling power when climbing grades or pushing heavy material.
- Erratic shift patterns: Internal debris or a worn valve body can cause the transmission to skip gears or hold a gear too long, leading to elevated operating temperatures.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.066.007 |
| Series | WG 211 |
| Assembly Type | Complete Powershift Unit |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Housing Material | High-tensile cast iron |
| OEM Reference | ZF 4657.066.007 |
| Max Input Torque | 1,200 Nm |
| Number of Speeds | 6 forward / 3 reverse |
Compatibility
This complete unit is engineered for the ZF WG 211 transmission family. It is directly compatible with models in the WG180, WG200, and WG210 series that share the same bell housing pattern and input shaft spline count. Common applications include the ZF 6WG211, 6WG180, and 6WG200 powershift transmissions found in articulated dump trucks, wheel loaders, and telescopic handlers. Always verify the torque converter housing match before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657120005 | PRESSURE REGULATOR | Controls main line pressure to clutch packs |
| 0501211384 | VALVE | Directs hydraulic flow for shift timing |
| 0630532183 | INDENTED RING | Seals piston bore to prevent cross-leakage |
| 4656306145 | PISTON | Applies clamping force to clutch discs |
| 0732042767 | COMPRESSION SPRING | Returns piston to neutral position |
| 0631612064 | SET SCREW | Locks valve body adjustment |
| 0631610026 | SET SCREW | Secures pressure regulator housing |
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657301130 | HOUS.FRONT SECT | Front section enclosing torque converter |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft |
