Overview
The ZF 4657.056.194 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully integrated, factory-matched assembly designed for heavy-duty off-highway machinery. This complete unit serves as the central power distribution hub within the WG 210 series, converting engine torque into controlled hydraulic and mechanical output for loader, dozer, and grader applications. The SKU 4657.056.194 represents a direct replacement assembly that eliminates the need for piecemeal rebuilding, ensuring precise clutch engagement and planetary gear alignment. This unit sits between the torque converter and the final drive, incorporating the main shaft, clutch packs, and valve body. For structural integrity, the assembly integrates with the 4657101082: TRANSMISSION HOUSING, which provides the rigid foundation for all rotating components.
Symptoms of Failure
- Erratic gear engagement and slipping under load: When the complete unit wears, internal clutch pack clearances increase, causing the transmission to hesitate or slip during directional shifts, particularly in reverse.
- Contaminated oil with metallic debris: Worn bearings or planetary gears within the assembly shed fine metal particles into the hydraulic circuit, leading to filter clogging and valve body sticking.
- Persistent oil leaks at the housing interface: Cracks or warpage in the main housing allow transmission fluid to escape around the bellhousing or rear seal area, often requiring replacement of the 4657201166: HOUS.FRONT SECT or 4657201170: HOUSING REAR PART.
- Delayed pressure buildup on cold start: Internal seal degradation prevents the hydraulic system from reaching operating pressure quickly, resulting in sluggish initial movement until the oil warms.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.056.194 |
| Assembly Type | 6-Speed Powershift (Complete Unit) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Housing Material | High-Strength Cast Iron (GGG-40) |
| Max Input Torque | 1,200 Nm |
| OEM Reference | ZF WG 210 Series |
| Fluid Capacity | 22 Liters (with cooler lines) |
| Bolt Torque Spec | 120 Nm (M12 cap screws) |
Compatibility
This complete unit is engineered for the ZF WG 210 series, but its core architecture also supports the WG 180 and WG 200 families due to shared clutch diameters and spline counts. It directly replaces units in ZF 6WG210, 6WG200, and 6WG180 transmissions found in Volvo L120, Caterpillar 950, and Case 921 wheel loaders. The assembly requires the 4657298102: HOUSING REAR SECTION for correct alignment on older WG 200 variants. Always verify the bellhousing pattern and torque converter pilot diameter 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 section supporting output shaft |
| 4657298102 | HOUSING REAR SECTION | Alternate rear housing for WG 200 |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0636100801 | CAP SCREW | M12 fastener for housing bolts |
| 4656301148 | FIXING PLATE | Locks clutch piston in position |
| 4657301032 | SCREEN SHEET | Fine mesh filter for oil sump |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M14 fastener for rear housing |
