Overview
The ZF 4657.066.027 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in replacement for heavy-duty powershift applications. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control elements into a single, ready-to-install package. As a core component of the WG 211 Series, the SKU 4657.066.027 serves as the central power transfer module, converting engine torque into controlled, multi-speed output for construction, agricultural, and material handling machinery. It sits directly between the engine flywheel housing and the final drive, requiring precise alignment with the 4657101049: TRANSMISSION HOUSING to ensure proper sealing and structural integrity.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn clutch discs or degraded hydraulic seals inside the assembly cause the transmission to hesitate or lose torque during shifting, especially when climbing grades or moving heavy loads.
- External oil leaks near the bell housing or output flange: Cracks in the casing or failed gaskets allow transmission fluid to escape, often visible as drips or wet spots on the ground beneath the vehicle.
- Unusual whining or grinding noises during operation: Damaged bearings or gear teeth within the 6 WG 211 produce audible metallic sounds that intensify with speed changes, indicating imminent internal failure.
- Delayed or no reverse engagement: Hydraulic pressure loss or a seized clutch pack prevents the reverse gear from engaging, leaving the machine stuck in forward-only mode.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.066.027 |
| Assembly Type | Complete Powershift Unit (6-speed) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | Cast Iron (GGG-40) |
| OEM Reference | ZF 6 WG 211 |
| Max Input Torque | 1,200 Nm |
| Hydraulic Pressure Range | 14–18 bar |
Compatibility
This complete unit is specifically engineered for the ZF WG 211 Series powershift transmissions. It is directly compatible with models including the WG180, WG200, and WG211 variants commonly found in ZF drivelines. The assembly also integrates with earlier WG series housings when used with the correct adapter components, such as the 4657301130: HOUS.FRONT SECT and the 4657301131: HOUSING REAR PART. For proper alignment during installation, the 0631306816: CYLINDRICAL PIN must be used to index the housing sections accurately.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657301130 | HOUS.FRONT SECT | Front section of the housing, supports input shaft |
| 4657301131 | HOUSING REAR PART | Rear housing section, encloses output bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636102489 | CAP SCREW | Fastener for housing flanges |
| 4656301148 | FIXING PLATE | Secures clutch pack retention |
| 0636102463 | CAP SCREW | Bolt for valve body mounting |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic circuit |
| 0636115287 | CAP SCREW | High-tensile bolt for output flange |
| 4657301065 | PLATE | Spacer plate for clutch adjustment |
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