Overview
The ZF 4657.056.178 6 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the planetary gear set, clutch packs, and hydraulic control system into a single, ready-to-install package. As the core of the WG 210 series, it manages torque distribution across six forward speeds, ensuring smooth power delivery under extreme loads. The SKU 4657.056.178 is a direct OEM replacement for machines requiring a full transmission swap, eliminating the need to rebuild individual sub-assemblies. When installing this unit, it is critical to inspect the TRANSMISSION HOUSING for cracks or wear, as the housing provides the structural foundation for the entire assembly.
Symptoms of Failure
- Delayed or harsh gear engagement: Worn clutch discs or valve body issues within the 4657.056.178 cause hesitation when shifting from neutral to drive, often accompanied by a loud clunk.
- Torque converter shudder under load: A failing assembly produces a low-frequency vibration during acceleration, particularly in lower gears, indicating internal hydraulic pressure loss.
- External oil leaks at the bell housing: Degraded seals allow transmission fluid to weep from the joint between the assembly and the HOUS.FRONT SECT, leaving puddles after operation.
- Intermittent loss of forward or reverse: Internal planetary gear damage causes the transmission to suddenly drop out of gear, requiring the operator to cycle the shifter to regain drive.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4657.056.178 |
| Assembly Type | 6 WG 210 Powershift Transmission |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 480 mm |
| Housing Material | High-strength cast iron |
| Clutch Type | Multi-disc, oil-cooled |
| OEM Reference | ZF 4657.056.178 |
Compatibility
This complete unit is engineered for the ZF WG 210 series, but its core architecture shares mounting patterns with the WG 180 and WG 200 families. It is a direct fit for models including the WG 210, WG 211, and WG 212, commonly used in telescopic handlers, wheel loaders, and industrial tractors. For proper sealing, always pair this assembly with a new HOUSING REAR PART and the HOUSING REAR SECTION to prevent misalignment of the output shaft. Verify bell housing bolt patterns against your existing TRANSMISSION HOUSING before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing torque converter |
| 4657201170 | HOUSING REAR PART | Rear casing for output shaft support |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for PTO mounting |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | Fastener for housing bolts |
| 4656301148 | FIXING PLATE | Retains clutch pack assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for oil sump |
| 0636100803 | CAP SCREW | High-tensile bolt for bell housing |
