Overview
The ZF 4657.056.020 6 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single ready-to-install package. As the core rotating assembly within the WG 210 series, it transfers engine torque through six forward speeds and one reverse, utilizing a countershaft design with hydraulically actuated multi-disc clutches. The SKU 4657.056.020 replaces worn or failed internal assemblies, restoring full power flow and shift quality. It is typically mounted between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, with the HOUSING REAR PART enclosing the output section. Precision alignment is ensured by the CYLINDRICAL PIN which locates the assembly during installation.
Symptoms of Failure
- Delayed or harsh engagement: When the internal clutch packs or sprag clutches wear, operators notice a pronounced lag between shifting and actual gear engagement, often accompanied by a jarring thud. This is a primary indicator that the 4657.056.020 assembly requires replacement.
- Intermittent gear slipping under load: A failing assembly will cause the transmission to momentarily lose torque during uphill climbs or heavy pushing, with engine RPM rising without corresponding vehicle speed. This slipping worsens as internal seals degrade.
- Metallic grinding or whining noise: Worn bearings or damaged gear teeth within the assembly produce a distinct high-pitched whine or grinding sound, particularly in lower gears. This noise often precedes complete mechanical failure.
- Contaminated transmission fluid with metallic debris: Visual inspection of the oil reveals silver or bronze particles, indicating advanced wear of the gear train or clutch friction material inside the 4657.056.020 unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4657.056.020 |
| Assembly Type | Complete Powershift Assembly (6 WG 210) |
| Overall Length | 485 mm (estimated) |
| Overall Width | 320 mm (estimated) |
| Overall Height | 340 mm (estimated) |
| Dry Weight | 62 kg (136.7 lbs) |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Type | Multi-disc, oil-cooled (sintered bronze) |
| OEM Reference | ZF 4657.056.020 / 6 WG 210 |
| Max Input Torque | 2100 Nm (estimated) |
| Speed Range | 6 forward / 1 reverse |
Compatibility
This complete assembly is specifically engineered for the ZF WG 210 series powershift transmissions. It is directly compatible with the following ZF transmission models: WG 210, WG 200, and WG 180 (when used with appropriate adapter housings). The 4657.056.020 is also found in select ZF 6 WG 210 variants used in telehandlers, wheel loaders, and industrial tractors from manufacturers such as JCB, Manitou, and Liebherr. Always verify the transmission serial number and housing configuration before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657201027 | HOUS.FRONT SECT | Front section housing input shaft and pump drive |
| 4657201012 | HOUSING REAR PART | Rear cover enclosing output shaft and PTO |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for assembly positioning |
| 0636100801 | CAP SCREW | M10 fastener for housing joints |
| 4656301148 | FIXING PLATE | Retains clutch pack in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | M12 fastener for rear housing |
| 4681301040 | OIL FEED.HOUSG. | Distributes pressurized oil to clutch packs |
