ZF 4657.066.029 6 WG 211 Powershift Transmission Assembly | Complete Unit
Overview
The ZF 4657.066.029 is a complete 6 WG 211 Powershift Transmission Assembly, engineered for heavy-duty industrial and agricultural machinery. This fully assembled unit integrates the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As the core power transfer module, it manages gear ratio changes under load without interrupting torque flow. The SKU 4657.066.029 is a direct OEM replacement, ensuring precise fitment within the WG 211 series. This assembly sits between the engine flywheel and the final drive, converting engine RPM into usable tractive effort across six forward and one reverse gear.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or valve body wear, operators experience a noticeable lag or jarring shift when moving from neutral to drive or reverse.
- Transmission fluid contamination with metallic debris: Worn planetary gears or bearings shed metal particles into the oil, visible during drain intervals as glitter or sludge in the filter.
- Loss of power under load (slipping): A failing torque converter or worn clutch discs cause the engine to rev without corresponding vehicle movement, especially on inclines or during heavy pulling.
- External oil leaks at housing seams: Cracks or gasket failures in the main casing lead to fluid loss, often pooling near the bell housing or output flange.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.066.029 |
| Transmission Series | WG 211 (6-speed powershift) |
| Overall Length | ~780 mm (estimated) |
| Dry Weight | ~340 kg (749 lbs) |
| Housing Material | High-strength cast iron (GGG-40) |
| Input Torque Capacity | ~1,100 Nm (811 ft-lbs) |
| Fluid Capacity | ~28 liters (SAE 10W-30 or ZF TE-ML 03) |
| Mounting Configuration | SAE 3 bell housing |
Compatibility
This complete assembly is specifically designed for the ZF WG 211 series, but its core architecture shares components with other WG family transmissions. It is a direct fit for models including the WG 180, WG 200, and WG 211 used in telehandlers, wheel loaders, and agricultural tractors from manufacturers like Case IH, New Holland, and JCB. The unit also cross-references with earlier WG 150 variants when used with the correct adapter plate. Always verify the bell housing pattern and output flange spline count against your original unit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Main structural casing that encloses all rotating assemblies |
| 4657301130 | HOUS.FRONT SECT | Front section housing the torque converter and pump drive |
| 4657301131 | HOUSING REAR PART | Rear casing supporting output shaft and PTO drive |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise housing mating during assembly |
| 0636102489 | CAP SCREW | M12 fastener securing housing halves together |
| 4656301148 | FIXING PLATE | Locking plate preventing fastener loosening under vibration |
| 0636102463 | CAP SCREW | M10 bolt for mounting the front section to the main housing |
| 4657201133 | SCREEN SHEET | Fine mesh filter protecting the hydraulic valve body |
| 0636115287 | CAP SCREW | M8 bolt for securing the screen sheet assembly |
| 4657301065 | PLATE | Clutch piston backing plate for gear pack preload |
