Overview
The ZF 4657.066.028 6 WG 211 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core of the WG 211 series, it manages torque distribution across six forward speeds, ensuring smooth power delivery under extreme loads. The SKU 4657.066.028 is a direct OEM replacement, eliminating the need for piecemeal rebuilding. When installing this unit, it is critical to inspect the TRANSMISSION HOUSING for cracks or wear, as the assembly seats directly into this structural component.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn clutch discs within the assembly cause delayed shifts or loss of torque, particularly in lower gears.
- Internal hydraulic pressure loss: A failing assembly often leads to insufficient line pressure, resulting in soft shifts and overheating of the transmission fluid.
- Metallic debris in the oil pan: Fragments from damaged planetary gears or bearings indicate advanced wear, requiring immediate replacement of the complete unit.
- Audible whining or grinding noises: Worn shaft bearings inside the assembly produce a distinct high-pitched whine during acceleration, worsening over time.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.066.028 |
| Assembly Type | 6-Speed Powershift (WG 211) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Housing Material | High-Grade Cast Iron |
| OEM Reference | ZF 6 WG 211 |
| Max Input Torque | 1,200 Nm |
Compatibility
This complete assembly is engineered for the ZF WG 211 series transmissions. It is directly compatible with models such as the WG180, WG200, and WG211 found in agricultural tractors, wheel loaders, and industrial forklifts. The unit also fits select variants of the WG150 and WG250 series when paired with the correct HOUS.FRONT SECT and HOUSING REAR PART. For precise alignment during installation, use the CYLINDRICAL PIN to locate the assembly within the bell housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657301130 | HOUS.FRONT SECT | Front section housing the input shaft |
| 4657301131 | HOUSING REAR PART | Rear section supporting output bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636102489 | CAP SCREW | Fastener for securing the housing |
| 4656301148 | FIXING PLATE | Locks the assembly to the chassis |
| 0636102463 | CAP SCREW | Bolt for clutch pack retention |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic fluid |
| 0636115287 | CAP SCREW | High-tensile bolt for output flange |
| 4657301065 | PLATE | Spacer plate for clutch clearance |
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