Overview
The ZF 4657.056.026 6 WG 210 Powershift Transmission Assembly | Complete Unit is a fully integrated drop-in replacement for heavy-duty off-highway applications. This complete assembly serves as the primary torque management and gear reduction core within the WG 210 series, housing all planetary gear sets, clutch packs, and hydraulic control valves. As a complete unit, SKU 4657.056.026 eliminates the need for piecemeal rebuilding, ensuring immediate operational readiness for wheel loaders, graders, and industrial tractors. The assembly interfaces directly with the driveline via the 4657103411: OUTPUT shaft and the 4644303379: OUTPUT FLANGE, which must be inspected during installation to guarantee proper torque transfer.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or seals degrade, the transmission may hesitate or slip when shifting between forward and reverse, especially under heavy torque demands.
- External oil leaks at housing seams: Worn gaskets or stress cracks in the main casing often cause fluid seepage around the bell housing or output flange area, leading to low oil levels and overheating.
- Delayed or harsh shifting: A failing hydraulic control system within the assembly can produce jarring shifts or a noticeable lag between gear changes, often accompanied by abnormal whining noises.
- Contaminated transmission fluid: Debris from worn friction plates or a clogged 4657303014: SCREEN SHEET can introduce metallic particles into the oil, reducing lubrication efficiency and accelerating internal wear.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4657.056.026 |
| Assembly Type | Complete Powershift Unit (6 WG 210) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 6 WG 210 Series |
| Torque Capacity (max) | 2,100 Nm |
| Fluid Capacity | 22 liters (5.8 gallons) |
Compatibility
This complete assembly is engineered specifically for the ZF WG 210 transmission series. It is also backward-compatible with earlier WG 180 and WG 200 models when used with the correct adapter hardware, such as the 0636021083: HEXAGON SCREW kit. Common applications include ZF 6 WG 210 powershift units found in Volvo, Caterpillar, and Case wheel loaders, as well as certain telehandlers and graders. Always verify bell housing alignment and output shaft spline count before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657103411 | OUTPUT | Transfers torque from transmission to driveline |
| 4644303379 | OUTPUT FLANGE | Connects output shaft to universal joint |
| 4657303014 | SCREEN SHEET | Filters debris from hydraulic fluid circuit |
| 0636021083 | HEXAGON SCREW | Secures housing and flange components |
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4657201027 | HOUS.FRONT SECT | Front section of transmission housing |
| 4657201012 | HOUSING REAR PART | Rear section of transmission housing |
| 0631306792 | CYLINDRICAL PIN | Aligns housing sections during assembly |
| 0636100801 | CAP SCREW | Fastens cover plates and valve bodies |
| 4656301148 | FIXING PLATE | Locks clutch pack components in position |
