Overview
The ZF 4657.056.025 6 WG 210 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control elements into a single, ready-to-install package. As the core rotating assembly within the WG 210 series, it transfers torque from the engine through six forward speeds and one reverse. The SKU 4657.056.025 is the direct replacement for worn or failed complete units, ensuring that the internal clearances and clutch timing are restored to OEM specifications. This assembly sits between the TRANSMISSION HOUSING and the HOUS.FRONT SECT, forming the structural backbone of the driveline.
Symptoms of Failure
- Erratic gear engagement and slipping under load: When the internal clutch packs or sprags wear, the transmission fails to hold torque, causing the machine to surge or lose power during grading or loading cycles.
- Metallic grinding noise from the bell housing: Worn bearings or damaged gear teeth within the 4657.056.025 assembly produce a distinct grinding sound, especially during directional shifts.
- Contaminated transmission fluid with bronze or steel particles: Debris from failing thrust washers or synchronizers circulates through the system, often clogging the SCREEN SHEET and reducing hydraulic pressure.
- Delayed or no reverse engagement: A specific failure of the reverse clutch piston or seal within this assembly leads to a complete loss of reverse function, requiring immediate replacement of the complete unit.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4657.056.025 |
| Assembly Type | Complete Powershift Unit (6 WG 210) |
| Overall Length | 485 mm (estimated) |
| Dry Weight | 68 kg (150 lbs) |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Count | 6 hydraulic clutches + 1 sprag |
| Max Input Torque | 2100 Nm |
| Oil Capacity (internal) | 4.5 liters |
| Related Fasteners | CAP SCREW (M12 x 1.5) |
| Related Sealing | OIL FEED.HOUSG. gasket |
Compatibility
This complete unit is engineered for the ZF WG 210 series powershift transmissions. It is directly compatible with models including the WG 180, WG 200, and WG 210. The assembly also fits select variants of the ZF 6WG series used in telehandlers, wheel loaders, and graders. For proper installation, the unit must be paired with the HOUSING REAR PART and secured using a CYLINDRICAL PIN for alignment. Always verify the serial number of your existing transmission before ordering the 4657.056.025.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101033 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201027 | HOUS.FRONT SECT | Front section housing input shaft |
| 4657201012 | HOUSING REAR PART | Rear section supporting output flange |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for housing halves |
| 0636100801 | CAP SCREW | Fastener for clutch pack retention |
| 4656301148 | FIXING PLATE | Secures internal oil distribution |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic circuit |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | Bolt for rear housing attachment |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil supply manifold |
