Overview
The ZF 4657.066.302 6 WG 211 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the clutch packs, planetary gear sets, and hydraulic control components into a single, ready-to-install package. As the core of the WG 211 series, it manages torque distribution across six forward speeds, enabling smooth power shifts under load. The SKU 4657.066.302 replaces worn or failed assemblies, restoring original ZF performance. This unit interfaces directly with the TRANSMISSION HOUSING to form the main structural shell, while the HOUS.FRONT SECT and HOUSING REAR PART enclose the rotating components. A CYLINDRICAL PIN aligns these housings during assembly, ensuring precise gear mesh.
Symptoms of Failure
- Delayed or harsh engagement: When the internal clutch packs wear, operators experience a noticeable lag between shifting and power delivery, often accompanied by a jarring engagement. This indicates hydraulic pressure loss within the 4657.066.302 assembly.
- Oil leaks at housing joints: Cracks in the HOUS.FRONT SECT or HOUSING REAR PART allow transmission fluid to escape, leading to low pressure and overheating. Look for drips near the bell housing or rear seal area.
- Gear slipping under load: A failing unit cannot maintain torque lockup, causing the transmission to slip out of gear during uphill climbs or heavy pulling. This symptom worsens as internal seals degrade.
- Unusual whining or grinding noises: Worn bearings or damaged planetary gears produce metallic sounds, especially in neutral or during deceleration. Immediate inspection of the complete assembly is required.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.066.302 |
| Assembly Type | 6 WG 211 Powershift Transmission (Complete Unit) |
| Dry 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) |
| OEM Reference | ZF 4657.066.302 |
| Max Input Torque | 1,200 Nm |
| Hydraulic Pressure Range | 18–22 bar |
Compatibility
This complete unit is engineered for the ZF WG 211 series, which includes models such as the WG180, WG200, and WG211. It is also compatible with select WG 150 variants that share the same bell housing pattern and input shaft spline count. The 4657.066.302 assembly directly replaces earlier revision units (e.g., 4657.066.300) without modification. For proper installation, verify that the TRANSMISSION HOUSING is free of cracks and that the CYLINDRICAL PIN is not worn, as misalignment will damage the new assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101087 | TRANSMISSION HOUSING | Main structural shell for gear train |
| 4657301172 | HOUS.FRONT SECT | Front section enclosing clutch packs |
| 4657301173 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636102489 | CAP SCREW | M12 fastener for housing joints |
| 4656301148 | FIXING PLATE | Locks clutch pack retaining ring |
| 0636102463 | CAP SCREW | M10 fastener for valve body |
| 4657201133 | SCREEN SHEET | Filter mesh for hydraulic circuit |
| 0636115287 | CAP SCREW | M8 fastener for oil pan |
| 4657301065 | PLATE | Spacer plate for clutch piston |
