Overview
The ZF 4657.066.038 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully integrated drop-in solution designed for heavy-duty industrial drivelines. This complete assembly serves as the central power distribution hub within the WG 211 series, managing torque flow from the engine to the output shaft across six forward speeds. The SKU 4657.066.038 represents a factory-matched unit that includes the main gear cluster, clutch packs, and hydraulic control valving. When replacing this assembly, it is critical to inspect the surrounding structural components. The TRANSMISSION HOUSING (4657101049) provides the rigid foundation for the entire unit, while the HOUS.FRONT SECT (4657301130) and HOUSING REAR PART (4657301131) enclose the rotating elements. Proper alignment is ensured by the CYLINDRICAL PIN (0631306816), which indexes the housing sections precisely.
Symptoms of Failure
When the ZF 4657.066.038 assembly begins to degrade, operators typically notice these specific failure modes:
- Erratic gear engagement under load: The transmission hesitates or clunks when shifting between forward ranges, particularly during low-speed maneuvering.
- Internal oil leaks pooling near the bell housing: Worn seal interfaces within the assembly allow ATF to escape, often leaving puddles after overnight parking.
- Gradual power loss during uphill operation: Slipping clutch packs inside the unit cause the engine RPM to rise without proportional vehicle acceleration.
- Metallic grinding noise from the center section: Bearing wear or gear tooth spalling produces a distinct whine that intensifies with road speed.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.066.038 |
| Assembly Type | 6-Speed Powershift, Complete Unit |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 410 mm |
| Overall Height | 480 mm |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Max Input Torque | 1,200 Nm |
| OEM Reference | ZF WG 211 Series |
Compatibility
This complete assembly is engineered for the ZF WG 211 series of powershift transmissions. Based on its design architecture, it is directly compatible with the following ZF models: WG180, WG200, WG211, and WG250 series. It is commonly found in agricultural tractors, wheel loaders, and industrial forklifts from manufacturers such as Case IH, New Holland, and JCB. Always verify the bell housing pattern and output flange configuration against your specific vehicle before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657301130 | HOUS.FRONT SECT | Front section enclosing input shaft |
| 4657301131 | HOUSING REAR PART | Rear section supporting output bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636102489 | CAP SCREW | M16 fastener for housing joints |
| 4656301148 | FIXING PLATE | Retains clutch pack assembly |
| 0636102463 | CAP SCREW | M12 fastener for valve body |
| 4657201133 | SCREEN SHEET | Oil filter mesh for hydraulic circuit |
| 0636115287 | CAP SCREW | M10 fastener for cover plates |
| 4657301065 | PLATE | Spacer plate for clutch piston |
