Overview
The ZF 4657.056.199 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully integrated drop-in solution for heavy-duty off-highway machinery. This complete assembly serves as the central torque and speed conversion hub within the WG 210 series, managing power flow from the engine to the driveline under extreme load conditions. The SKU 4657.056.199 designates a factory-matched unit that includes the main gear cluster, clutch packs, and hydraulic control valving. When rebuilding a transmission, this assembly is typically mounted directly onto the TRANSMISSION HOUSING, which provides the structural foundation for the entire gear train.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, operators notice a pronounced lag between shifting and actual gear engagement, often accompanied by a jarring clunk.
- Intermittent power loss under load: A failing unit causes the machine to lose pulling power on inclines or during heavy digging cycles, a classic sign of internal clutch pack slippage.
- Contaminated transmission fluid with metallic debris: Worn bearings or gear teeth shed fine metal particles into the oil, visible during routine fluid changes as a silver or bronze sheen.
- Audible whining or grinding from the bell housing: High-pitched noises that increase with engine RPM indicate advanced wear on the planetary gear sets within the assembly.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4657.056.199 |
| Assembly Type | Complete Powershift Unit (6-speed) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Primary Material | High-grade cast iron with hardened steel gears |
| OEM Reference | ZF 6 WG 210 |
| Bolt Torque (housing interface) | 120 Nm (see CAP SCREW specs) |
Compatibility
This complete unit is engineered specifically for the ZF WG 210 series powershift transmissions. It is directly compatible with the WG180, WG200, and WG210 models used in articulated dump trucks, wheel loaders, and graders from manufacturers such as Caterpillar, Volvo, and Liebherr. The assembly interfaces seamlessly with the HOUS.FRONT SECT and the HOUSING REAR PART, ensuring correct alignment of the output shaft. For extended rebuilds, the HOUSING REAR SECTION may also be replaced concurrently to eliminate wear on the bearing journals.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Main structural casing for the gear train |
| 4657201166 | HOUS.FRONT SECT | Front section housing the input shaft and pump drive |
| 4657201170 | HOUSING REAR PART | Rear section supporting the output flange |
| 4657298102 | HOUSING REAR SECTION | Alternate rear housing variant for specific ratios |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0636100801 | CAP SCREW | M16 fastener for main housing bolts |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit (thin) |
| 4657301033 | SCREEN SHEET | Fine mesh filter for hydraulic circuit (thick) |
| 0636100803 | CAP SCREW | M12 fastener for accessory mounting |
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