Overview
The ZF 4657.066.034 6 WG 211 Powershift Transmission Assembly | Complete Unit is a fully assembled, ready-to-install gearbox core designed for heavy-duty off-highway machinery. As a complete unit, it integrates the main gear cluster, clutch packs, and hydraulic control system into a single, sealed assembly. This SKU (4657.066.034) serves as the central power transfer module in the WG 211 series, converting engine torque into controlled, multi-speed output for loaders, graders, and industrial vehicles. The assembly is precision-machined to accept critical structural components such as the 4657101049: TRANSMISSION HOUSING, which encloses the rotating elements, and the 4657301130: HOUS.FRONT SECT that seals the front clutch area. For rear-end integrity, the 4657301131: HOUSING REAR PART completes the structural envelope, while the 0631306816: CYLINDRICAL PIN ensures precise alignment during final assembly.
Symptoms of Failure
When the ZF 4657.066.034 assembly begins to fail, operators typically notice these specific performance issues:
- Erratic gear engagement or slipping under load: Worn clutch discs or damaged seals inside the unit cause the transmission to hesitate or lose torque during acceleration, especially in forward gears.
- Hydraulic oil leaks from the main case seam: Cracks or gasket failures in the assembly body allow transmission fluid to weep around the mating surfaces, often requiring replacement of the TRANSMISSION HOUSING to restore sealing.
- Metallic grinding noise during shifting: Debris from bearing failure or gear tooth spalling within the assembly produces a distinct grinding sound, indicating internal component disintegration.
- Delayed or no reverse engagement: A failing hydraulic control valve or blocked oil passages in the complete unit prevent the reverse clutch pack from pressurizing, leaving the vehicle stuck in forward-only mode.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4657.066.034 |
| Assembly Type | Complete Powershift Unit (6 WG 211) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Primary Material | High-tensile cast iron housing with steel gears |
| OEM Reference | ZF 4657.066.034 |
| Fastener Torque Spec | Refer to ZF service manual (M16 bolts: 210 Nm) |
Compatibility
This complete unit is engineered for the ZF WG 211 series of powershift transmissions. Based on its design and part number structure, it is compatible with the following ZF transmission models:
- ZF WG 211 (direct fit)
- ZF WG 180 (with adapter modifications)
- ZF WG 200 (shared clutch pack architecture)
- ZF 6 WG 211 (6-speed variant)
Always verify your transmission model tag before installation. The assembly is not backward-compatible with older WG 150 or WG 120 series without significant housing changes.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural case enclosing the gear train |
| 4657301130 | HOUS.FRONT SECT | Front section housing the input clutch pack |
| 4657301131 | HOUSING REAR PART | Rear section supporting output shaft bearings |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise case assembly |
| 0636102489 | CAP SCREW | M16 fastener for housing joint |
| 4656301148 | FIXING PLATE | Locks clutch pack retaining nut |
| 0636102463 | CAP SCREW | M12 fastener for front section |
| 4657201133 | SCREEN SHEET | Oil filter mesh inside the sump |
| 0636115287 | CAP SCREW | M10 fastener for rear housing |
| 4657301065 | PLATE | Spacer plate for clutch pack shimming |
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