Overview
The ZF 4657.055.126 5 WG 210 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in replacement for heavy-duty powershift transmissions in the WG 210 series. This complete unit integrates the main gear cluster, clutch packs, and hydraulic control system into a single, pre-tested assembly. As a core component, it sits between the engine and the driveline, managing torque distribution across five forward speeds. The SKU 4657.055.126 identifies this as a factory-spec complete unit, ensuring direct compatibility with existing mounting points. For maximum structural integrity, this assembly is designed to be paired with the 4657101082: TRANSMISSION HOUSING, which provides the rigid outer shell necessary for high-torque applications.
Symptoms of Failure
When the ZF 4657.055.126 complete unit begins to fail, operators typically notice these specific warning signs:
- Erratic gear engagement or slipping under load – Worn clutch packs inside the assembly cause delayed or incomplete shifts, especially when moving heavy equipment uphill.
- Hydraulic fluid leaks near the bell housing – Degraded seals within the complete unit allow transmission oil to escape, leading to low pressure and overheating.
- Unusual whining or grinding noises during gear changes – Damaged bearings or planetary gears create audible distress, often worsening as the unit warms up.
- Loss of power in forward or reverse gears – Internal hydraulic valve failure prevents proper clutch application, resulting in sluggish movement or complete driveline disengagement.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4657.055.126 |
| Assembly Type | Complete Powershift Unit (5 WG 210) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 5 WG 210 |
| Bolt Torque Spec (housing) | 120 Nm (M12 cap screws) |
| Fluid Capacity | 12.5 liters (ZF TE-ML 03) |
Compatibility
This complete unit is engineered for the ZF WG 210 series of powershift transmissions. It is directly compatible with the following ZF models: WG 180, WG 200, WG 210, and WG 250 variants used in agricultural tractors, wheel loaders, and industrial forklifts. The assembly integrates with the 4657201166: HOUS.FRONT SECT and the 4657201170: HOUSING REAR PART to form a sealed driveline. For extended configurations, the 4657298102: HOUSING REAR SECTION can be added for additional PTO mounting options.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101082 | TRANSMISSION HOUSING | Outer shell for gear and clutch protection |
| 4657201166 | HOUS.FRONT SECT | Front section for input shaft support |
| 4657201170 | HOUSING REAR PART | Rear section for output bearing housing |
| 4657298102 | HOUSING REAR SECTION | Extended rear section for PTO adapters |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for housing mating surfaces |
| 0636100801 | CAP SCREW | M12 bolt for housing fastening |
| 4656301148 | FIXING PLATE | Retains clutch pack assembly |
| 4657301032 | SCREEN SHEET | Fine mesh filter for hydraulic oil |
| 4657301033 | SCREEN SHEET | Coarse mesh pre-filter for sump |
| 0636100803 | CAP SCREW | M10 bolt for cover plate mounting |
