Overview
The ZF 4657.056.125 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully assembled, ready-to-install core component designed for heavy-duty off-highway machinery. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control elements within a single, precision-machined housing. As the central power transfer module in the WG 210 series, it converts engine torque into controlled, multi-speed output for applications like wheel loaders, graders, and industrial tractors. The SKU 4657.056.125 identifies this as a factory-balanced assembly, ensuring minimal vibration and optimal gear mesh alignment. For a full rebuild, this unit must be paired with a robust TRANSMISSION HOUSING to protect internal components from debris and stress.
Symptoms of Failure
When the ZF 4657.056.125 assembly begins to degrade, operators will notice distinct performance drops. Watch for these specific failure modes:
- Erratic gear engagement or slipping under load – Worn clutch discs or piston seals inside the unit cause delayed shifts, especially when transitioning from forward to reverse.
- High-frequency whining or grinding noises – Damaged bearings or gear teeth produce a metallic sound that intensifies with engine RPM, indicating internal wear.
- External oil leaks near the bell housing – Cracks in the HOUS.FRONT SECT or degraded gaskets allow transmission fluid to escape, leading to low pressure and overheating.
- Intermittent loss of drive in specific gears – A failing torque converter or broken planetary gear set causes the machine to suddenly stop moving despite engine revs.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.056.125 |
| Assembly Type | Complete Powershift Unit (6-speed) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| Max Input Torque | 2,100 Nm |
| OEM Reference | ZF 6 WG 210 |
| Bolt Torque Spec | 120 Nm (M16 cap screws) |
Compatibility
This complete unit is engineered for the ZF WG 210 series, but its core architecture is shared across several ZF powershift families. It is directly compatible with WG 180, WG 200, and WG 211 transmissions used in Caterpillar, Volvo, and Case wheel loaders. The assembly also fits select ZF 6 WG 200 and ZF 4 WG 210 variants with minor adapter plate modifications. Always verify the rear housing alignment; the HOUSING REAR PART and HOUSING REAR SECTION must match the output flange pattern of your specific machine model.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101080 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201167 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657201171 | HOUSING REAR PART | Rear section supporting output shaft bearings |
| 4657298103 | HOUSING REAR SECTION | Extended rear cover for PTO adapter |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M16 bolt for housing flange fastening |
| 4656301148 | FIXING PLATE | Locks bearing preload adjustment nut |
| 4657301034 | SCREEN SHEET | Fine mesh filter for hydraulic return line |
| 4657301035 | SCREEN SHEET | Coarse mesh filter for suction line |
| 0636100803 | CAP SCREW | M12 bolt for valve body attachment |
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