Overview
The ZF 4656.056.102 6 WG 160 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in replacement for heavy-duty off-highway vehicles and industrial machinery. This complete unit integrates the planetary gear sets, clutch packs, and hydraulic control system into a single, pre-tested assembly. As the core power transfer module in the WG 160 series, it converts engine torque into precisely controlled wheel speed and direction. The SKU 4656.056.102 denotes a complete assembly, ensuring that the internal components—including the main shaft and valve body—are matched to factory tolerances. When installing this unit, it is critical to inspect the surrounding structural components such as the 4656101057: TRANSMISSION HOUSING and the 4656201075: HOUS.FRONT SECT for wear, as these housings directly support the assembly’s alignment.
Symptoms of Failure
When the ZF 4656.056.102 assembly begins to degrade, operators will notice distinct performance issues. Common failure symptoms include:
- Delayed or harsh gear engagement – The transmission hesitates before shifting into forward or reverse, often accompanied by a loud clunk.
- Internal oil leaks – Hydraulic fluid pools around the bell housing or drips from the main case, indicating seal or gasket failure within the assembly.
- Torque converter shudder – A vibration felt during low-speed maneuvering, suggesting worn clutch plates or a failing stator.
- Loss of power under load – The engine revs higher than normal without proportional vehicle movement, pointing to slipping clutches or a damaged planetary gear set.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4656.056.102 |
| Assembly Type | 6 WG 160 Powershift Transmission (Complete Unit) |
| Dry Weight (approx.) | 320 kg (705 lbs) |
| Overall Length | 680 mm |
| Overall Width | 520 mm |
| Overall Height | 480 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 1,600 Nm |
| Fluid Capacity | 18 liters (ZF TE-ML 03 spec) |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This complete unit is specifically engineered for the ZF WG 160 series. It is a direct fit for models including the WG 160, WG 180, and WG 200 transmissions found in loaders, graders, and industrial tractors. The assembly also shares mounting interfaces with the WG 150 and WG 210 variants, though hydraulic line routing may differ. For a full rebuild, ensure the 4656201078: HOUSING REAR PART and the 4656298050: HOUSING REAR SECTION are free of cracks, as these sections seal the output shaft area.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101057 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train |
| 4656201075 | HOUS.FRONT SECT | Front section housing the torque converter and pump |
| 4656201078 | HOUSING REAR PART | Rear casing that supports the output shaft and PTO |
| 4656298050 | HOUSING REAR SECTION | Extended rear section for additional planetary stages |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 4656301148 | FIXING PLATE | Retains clutch pack springs in the drum |
| 0636100817 | CAP SCREW | M12 bolt for securing the valve body cover |
| 4656301016 | SCREEN SHEET | Fine mesh filter for the lube oil circuit |
| 4656301017 | SCREEN SHEET | Coarse mesh filter for the suction line |
| 0636100803 | CAP SCREW | M10 bolt for the oil pan attachment |
