Overview
The ZF 4657.056.326 6 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This fully assembled transmission integrates the main housing, clutch packs, and hydraulic control system into a single, ready-to-install package. The SKU 4657.056.326 serves as the core replacement for the WG 210 Series, eliminating the need for piecemeal rebuilding. When installing this assembly, ensure the HOUS.FRONT SECT is properly aligned to the main casing to prevent misalignment of internal shafts. This unit is engineered to handle high torque loads in wheel loaders, graders, and material handlers.
Symptoms of Failure
When the ZF 4657.056.326 assembly begins to degrade, operators will notice distinct performance issues. Delayed engagement or gear slipping under load is the most common complaint, often caused by worn clutch discs or degraded seals within the unit. External oil leaks at the front housing interface typically indicate a failed O-RING between the main case and the front section. Erratic shifting or loss of power in forward gears suggests internal hydraulic pressure loss, often traced to a damaged CYLINDRICAL PIN that secures the valve body. Excessive vibration during operation may point to a loose 螺栓 (cap screw) in the clutch pack assembly, leading to uneven torque distribution.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.056.326 |
| Series | WG 210 (6-speed) |
| Dry Weight (approx.) | 285 kg (628 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 480 mm |
| Housing Material | Cast Iron (GGG-40) |
| Input Torque Capacity | 1,200 Nm (885 lb-ft) |
| OEM Reference | ZF 4657.056.326 |
| Fluid Capacity | 18.5 L (4.9 gal) |
Compatibility
This complete unit is specifically engineered for the ZF WG 210 transmission series. It is directly compatible with the WG 180, WG 200, and WG 210 models used in Volvo L90/L120 loaders, Case 921E wheel loaders, and Caterpillar 950H graders. The assembly also fits select WG 150 variants when paired with the correct CAP SCREW kit. Always verify the bell housing pattern matches your application; the WG 210 uses a SAE 3 flywheel housing. For machines originally equipped with a WG 180, the 4657.056.326 unit provides a direct bolt-in upgrade with improved clutch modulation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657201161 | HOUS.FRONT SECT | Front housing section for input shaft support |
| 0636115293 | 螺栓 (Bolt) | M12 cap screw for clutch pack retention |
| 0634313603 | O-RING | Seal for front housing to main case joint |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for valve body positioning |
| 0636100801 | CAP SCREW | M10 bolt for oil pump mounting |
| 4656301148 | FIXING PLATE | Locking plate for output flange |
| 4657301032 | SCREEN SHEET | Fine mesh filter for suction line |
| 4657301033 | SCREEN SHEET | Coarse mesh filter for return line |
| 0636100803 | CAP SCREW | M8 bolt for control valve cover |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing for clutch lubrication |
