Overview
The ZF 4657.066.305 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully integrated, factory-assembled gearbox core designed for heavy-duty off-highway machinery. This complete unit serves as the primary power transfer module, converting engine torque into controlled, multi-speed output for wheel loaders, graders, and industrial tractors. The SKU 4657.066.305 identifies a direct replacement for the original WG 211 series assembly, eliminating the need for piecemeal rebuilds. Within the transmission architecture, this assembly houses the planetary gear sets, clutch packs, and hydraulic valve body, all enclosed within a robust cast housing. For structural integrity, the unit integrates with the 4657101087: TRANSMISSION HOUSING and is precisely aligned using the 0631306816: CYLINDRICAL PIN to ensure concentric shaft alignment.
Symptoms of Failure
When the ZF 4657.066.305 assembly begins to fail, operators typically notice these specific issues:
- Erratic gear engagement or slipping under load: Worn clutch discs or degraded seals inside the assembly cause the transmission to slip during high-torque operations, especially when shifting from forward to reverse.
- External oil leaks at the housing seams: Cracks or gasket failures in the 4657301172: HOUS.FRONT SECT or the 4657301173: HOUSING REAR PART lead to visible hydraulic fluid loss, often accompanied by a burnt smell.
- Delayed or harsh shifting: Contaminated valve bodies or worn accumulator pistons within the complete unit result in a noticeable lag or jarring engagement when selecting gears.
- Unusual whining or grinding noises: Bearing wear or planetary gear damage inside the assembly produces a high-pitched whine or metallic grinding, particularly at low speeds.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4657.066.305 |
| Series | WG 211 |
| Assembly Type | Complete Powershift Unit |
| Estimated Weight | 185 kg (408 lbs) |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Number of Speeds | 6 Forward / 3 Reverse |
| Max Input Torque | 650 Nm |
| 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 variants when used with the correct adapter kit. It is commonly found in the following ZF transmission models:
- ZF 6 WG 211 (primary application)
- ZF 4 WG 180 (with housing modifications)
- ZF 6 WG 200 (with updated clutch pack)
- ZF 4 WG 210 (limited compatibility)
For a complete rebuild, ensure the 4657101087: TRANSMISSION HOUSING is inspected for cracks, and verify that the 4657301172: HOUS.FRONT SECT and 4657301173: HOUSING REAR PART are free from warpage. The 0631306816: CYLINDRICAL PIN must be replaced during reassembly to maintain dowel alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101087 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657301172 | HOUS.FRONT SECT | Front section housing input shaft |
| 4657301173 | HOUSING REAR PART | Rear section supporting output flange |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636102489 | CAP SCREW | Fastener for housing bolts |
| 4656301148 | FIXING PLATE | Locks bearing in position |
| 0636102463 | CAP SCREW | Mounting bolt for valve body |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic circuit |
| 0636115287 | CAP SCREW | Torque-specific housing fastener |
| 4657301065 | PLATE | Clutch pack retaining plate |
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