Overview
The ZF 4657.066.301 6 WG 211 Powershift Transmission Assembly is a complete, factory-grade unit designed for heavy-duty off-highway machinery. This assembly serves as the central torque and speed modulation core within the WG 211 series, integrating the clutch packs, planetary gearsets, and hydraulic control circuits into a single, ready-to-install package. The SKU 4657.066.301 denotes a fully assembled unit, eliminating the need for piecemeal component sourcing. It sits directly between the engine flywheel housing and the final drive, converting engine power into precise, shiftable output for loaders, graders, and industrial vehicles.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or hydraulic seals degrade, the transmission may hesitate or fail to hold gear during heavy digging or pushing operations.
- Internal hydraulic pressure loss: A worn unit often causes low system pressure, leading to delayed shifts or a complete loss of forward/reverse function.
- Contaminated oil with metallic debris: Friction material wear or bearing failure introduces bronze or steel particles into the fluid, visible during routine oil sampling.
- External oil seepage from housing joints: Cracks or gasket failures in the main casing allow fluid to escape, often mistaken for engine oil leaks.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.066.301 |
| Assembly Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Disc Material | Sintered bronze on steel |
| Max Input Torque | 1,200 Nm |
| OEM Reference | ZF 6 WG 211 |
Compatibility
This complete unit is engineered for the ZF WG 211 series, but its core architecture shares mounting patterns and hydraulic interfaces with earlier WG 180 and WG 200 models. It is directly compatible with all WG 211 variants (WG 211, WG 211 II, WG 211 III) used in loaders from manufacturers such as Volvo, Case, and JCB. For proper installation, ensure the 4657101087: TRANSMISSION HOUSING is inspected for cracks, and that the 4657301172: HOUS.FRONT SECT aligns correctly with the engine bellhousing. The 4657301173: HOUSING REAR PART must be torqued to spec to prevent misalignment. Finally, the 0631306816: CYLINDRICAL PIN is critical for dowel alignment during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101087 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4657301172 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657301173 | HOUSING REAR PART | Rear section enclosing output shaft and parking brake |
| 0631306816 | CYLINDRICAL PIN | Precision alignment dowel for housing mating |
| 0636102489 | CAP SCREW | M12 fastener for housing bolt circle |
| 4656301148 | FIXING PLATE | Retains clutch piston assembly in bore |
| 0636102463 | CAP SCREW | M10 fastener for valve body attachment |
| 4657201133 | SCREEN SHEET | Fine mesh filter for hydraulic oil return |
| 0636115287 | CAP SCREW | M8 fastener for oil pan and cover plates |
| 4657301065 | PLATE | Spacer plate between clutch pack and housing |
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