Overview
The ZF 4657.066.040 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully integrated, factory-spec drivetrain component designed for heavy-duty off-highway machinery. This complete assembly serves as the core power distribution hub within the WG 211 series, managing torque flow from the engine to the final drives through six forward speeds and one reverse. The SKU 4657.066.040 represents a direct replacement unit that includes the main housing, internal clutch packs, and hydraulic valve body. When installing this assembly, it is critical to verify the condition of the 4657101049: TRANSMISSION HOUSING and the 4657301130: HOUS.FRONT SECT to ensure proper alignment and sealing of the complete unit.
Symptoms of Failure
When the ZF 4657.066.040 assembly begins to fail, operators typically notice these specific warning signs:
- Erratic gear engagement or slipping under load – The transmission hesitates or fails to hold gear when climbing grades or carrying heavy payloads, often caused by worn clutch discs or degraded seals within the unit.
- External oil leaks at the housing joints – Hydraulic fluid seeps from the mating surfaces between the main housing and the 4657301131: HOUSING REAR PART, indicating gasket failure or housing distortion.
- Unusual metallic grinding or whining noises – Internal bearing wear or gear tooth damage produces a distinct high-pitched sound that intensifies with speed, often accompanied by vibration in the driveline.
- Delayed or harsh shifting – The transmission exhibits a noticeable lag between shift commands and actual gear changes, or slams into gear, pointing to hydraulic pressure loss or valve body issues.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.066.040 |
| Series | WG 211 |
| Type | Powershift Transmission Assembly (Complete Unit) |
| Weight (estimated) | 185 kg (408 lbs) |
| Dimensions (L x W x H) | 620 mm x 480 mm x 410 mm |
| Material | Cast Iron Housing with Steel Alloy Internals |
| OEM Reference | ZF Friedrichshafen AG |
| Number of Speeds | 6 Forward / 1 Reverse |
Compatibility
This complete unit is engineered specifically for the ZF WG 211 transmission series. It is also compatible with the following ZF models that share the same mounting pattern and hydraulic architecture: WG 180, WG 200, and WG 250 series transmissions. The assembly integrates directly with the 0631306816: CYLINDRICAL PIN for precise alignment during installation. Always cross-reference your machine’s serial number with the ZF parts catalog to confirm fitment, as minor variations exist between early and late production runs of the WG 211.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing that encloses gear sets and shafts |
| 4657301130 | HOUS.FRONT SECT | Front section housing that supports input shaft and pump drive |
| 4657301131 | HOUSING REAR PART | Rear section that houses output shaft and parking brake mechanism |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing assembly positioning |
| 0636102489 | CAP SCREW | Fastener for securing housing sections together |
| 4656301148 | FIXING PLATE | Retaining plate for clutch pack assembly |
| 0636102463 | CAP SCREW | Bolt for mounting valve body to housing |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic oil return circuit |
| 0636115287 | CAP SCREW | Fastener for oil pan attachment |
| 4657301065 | PLATE | Thrust washer for planetary gear support |
