Overview
The ZF 4657.056.122 6 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. As the core of the WG 210 series, this assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. The SKU 4657.056.122 replaces worn or failed transmissions in wheel loaders, dozers, and material handlers, restoring full power flow from the torque converter to the driveline. For a full rebuild, the TRANSMISSION HOUSING provides the structural foundation, while the HOUS.FRONT SECT seals the forward clutch assembly.
Symptoms of Failure
- Delayed engagement or gear slipping under load: Worn clutch discs or piston seals inside the assembly cause the transmission to hesitate when shifting from neutral to forward or reverse, particularly on inclines.
- Low hydraulic pressure and erratic shifting: Internal leakage past spool valves or damaged sealing rings results in pressure drops below 12 bar, leading to harsh or missed shifts.
- Metallic debris in the oil filter or sump: Bearing spalling or gear tooth chipping generates fine metal particles, which can clog the SCREEN SHEET and accelerate wear on adjacent components.
- External oil leaks from the housing joints: Cracks or porosity in the HOUSING REAR PART or the HOUSING REAR SECTION allow ATF to escape, reducing lubrication and causing overheating.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.056.122 |
| Assembly Type | 6-Speed Powershift Transmission (Complete) |
| Series | WG 210 |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Input Torque Capacity | 2,100 Nm (1,549 lb-ft) |
| OEM Reference | ZF 4657.056.122 |
| Related Fastener | CAP SCREW (M12 x 1.5) |
| Related Fastener | CAP SCREW (M10 x 1.5) |
| Alignment Component | CYLINDRICAL PIN |
| Retention Component | FIXING PLATE |
| Filter Media | SCREEN SHEET (Fine Mesh) |
Compatibility
This complete unit is engineered for the ZF WG 210 series, but it also fits select models in the WG 180 and WG 200 families when used with the correct bellhousing adapter. Specifically, it is compatible with ZF WG 180, WG 200, and WG 210 transmissions found in Volvo L120/L150 wheel loaders, Case 921E/1021G loaders, and Caterpillar 950M/962M machines. Always verify the flange pattern against your existing TRANSMISSION HOUSING before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4657201166 | HOUS.FRONT SECT | Front section housing input shaft and torque converter |
| 4657201170 | HOUSING REAR PART | Rear casing enclosing output shaft and PTO drive |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for additional planetary support |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing-to-housing positioning |
| 0636100801 | CAP SCREW | M12 fastener for main housing bolts |
| 0636100803 | CAP SCREW | M10 fastener for valve body and cover plates |
| 4656301148 | FIXING PLATE | Retainer for clutch piston spring pack |
| 4657301032 | SCREEN SHEET | Coarse filter screen for hydraulic suction line |
| 4657301033 | SCREEN SHEET | Fine filter screen for lubrication circuit |
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