Overview
The ZF 4657.056.028 6 WG 210 Powershift Transmission Assembly is a complete, factory-sealed unit designed for heavy-duty off-highway machinery. As the core hydraulic-mechanical assembly in the WG 210 series, it integrates the torque converter, planetary gear sets, and clutch packs into a single, pre-assembled module. This SKU 4657.056.028 replaces the need for individual component rebuilding, offering a direct drop-in solution for loaders, dozers, and graders. The assembly sits between the engine flywheel housing and the final drive, managing power distribution across six forward and three reverse speeds. For structural integrity, this unit mates directly with the TRANSMISSION HOUSING, the HOUS.FRONT SECT, and the HOUSING REAR PART to form the complete gearbox casing.
Symptoms of Failure
- Erratic shifting or gear slippage under load: When the internal clutch packs or valve body wear, the transmission fails to hold pressure, causing the machine to lose power during grading or pushing operations.
- External oil leaks at the main case seams: Degraded gaskets or housing cracks around the CYLINDRICAL PIN alignment points can lead to significant fluid loss, visible as drips under the bell housing.
- Delayed engagement or harsh direction changes: Worn seals inside the powershift unit cause a lag when shifting from forward to reverse, often accompanied by a loud clunk.
- Overheating transmission fluid: Internal wear debris restricts oil flow through the cooler circuit, leading to high sump temperatures and reduced component life.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.056.028 |
| Assembly Type | Complete Powershift Unit (6 WG 210) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| OEM Reference | ZF 4657.056.028 |
| Bolt Torque (Main Housing) | 120 Nm (M12 x 1.5) |
| Fluid Capacity (system) | 22 liters (ZF EcoFluid M-2) |
Compatibility
This complete assembly is engineered for the ZF WG 210 series powershift transmissions. It is directly compatible with models including the WG180, WG200, and WG210 found in articulated dump trucks, wheel loaders, and telehandlers. The unit also fits select variants of the WG150 and WG160 series when used with the correct adapter plate. Always verify the bell housing pattern against your machine’s OEM specifications before installation. For ancillary components, consider the CAP SCREW and FIXING PLATE for secure mounting, along with the SCREEN SHEET and SCREEN SHEET for filtration upgrades.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101040 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201028 | HOUS.FRONT SECT | Front section housing torque converter |
| 4657201013 | HOUSING REAR PART | Rear casing for output shaft support |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing sections |
| 0636100801 | CAP SCREW | Fastener for housing flanges |
| 4656301148 | FIXING PLATE | Retainer for clutch pack assembly |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301049 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | High-tensile bolt for rear housing |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil distribution manifold |
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