Overview
The ZF 4657.055.121 5 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This fully assembled gearbox integrates the clutch packs, planetary gearsets, and hydraulic control system into a single, ready-to-install package. As the core power transfer component in the WG 210 series, it manages torque distribution across five forward speeds and one reverse. The SKU 4657.055.121 denotes a complete assembly, not a sub-component, making it a direct replacement for worn-out transmissions in loaders, graders, and industrial tractors. This unit interfaces directly with the TRANSMISSION HOUSING to form the sealed driveline envelope.
Symptoms of Failure
- Delayed or harsh engagement: When the transmission hesitates before moving forward or reverse, or slams into gear, internal clutch pack wear or hydraulic pressure loss is present.
- Oil leaks at housing seams: Visible fluid weeping around the joint between the assembly and the HOUS.FRONT SECT indicates seal degradation or casing fatigue.
- Gear slipping under load: The engine revs increase without proportional vehicle speed, particularly in higher ranges, signaling worn friction discs or damaged planetary gears.
- Metallic grinding noise: A persistent whine or grinding sound from the bell housing area suggests bearing failure or debris contamination within the assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.055.121 |
| Assembly Type | 5-Speed Powershift (WG 210) |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-Grade Cast Iron |
| OEM Reference | ZF 4657.055.121 |
| Torque Capacity (est.) | 2100 Nm |
Compatibility
This complete unit is engineered for the ZF WG 210 series transmission family. It is directly compatible with WG 210 models used in loaders and graders from 2010 onward. The assembly also fits select WG 200 and WG 180 variants when paired with the correct HOUSING REAR PART and HOUSING REAR SECTION. Always verify your transmission model tag before ordering. This unit replaces earlier 5 WG 200 assemblies with identical bolt patterns.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657201166 | HOUS.FRONT SECT | Front section enclosing the torque converter |
| 4657201170 | HOUSING REAR PART | Rear casing for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Extended rear housing for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing assembly |
| 0636100801 | CAP SCREW | Fastener for housing bolt connections |
| 4656301148 | FIXING PLATE | Retaining plate for clutch pack assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for oil return |
| 0636100803 | CAP SCREW | High-tensile bolt for rear housing |
