Overview
The ZF 4661.002.010 4 WG 90 Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway machinery. This assembly integrates the full clutch pack, planetary gear set, and hydraulic control system into a single, ready-to-install package. Designed as the core power transfer module for the WG 90 series, the SKU 4661.002.010 replaces worn or failed transmissions in wheel loaders, graders, and industrial tractors. It sits directly between the engine flywheel and the final drive, managing torque distribution across four forward and three reverse speeds. When installed, it must be paired with a sound 4661101032: TRANSMISSION HOUSING to ensure proper alignment and oil containment.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn clutch discs or degraded seals inside the assembly cause the transmission to hesitate or lose torque during acceleration, especially on inclines.
- External oil seepage from the main casing: Cracks or gasket failure in the unit lead to fluid loss, often visible as drips near the bell housing or output flange.
- Abnormal whining or grinding noises: Damaged bearings or planetary gears produce a high-pitched whine during neutral coasting or a grinding sound when shifting.
- Delayed or harsh shifting: Hydraulic pressure loss from internal wear results in a noticeable lag between gear changes or a jarring engagement.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4661.002.010 |
| Assembly Type | Complete Powershift Unit (4 WG 90) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Plate Material | Sintered bronze on steel |
| Max Input Torque | 900 Nm |
| Oil Capacity | 12.5 liters (ZF TE-ML 03 fluid) |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This complete unit is specifically engineered for the ZF WG 90 series powershift transmissions. It is directly compatible with models including the WG 90, WG 98, and WG 100, commonly found in loaders and graders from manufacturers such as Case, New Holland, and Volvo. For proper installation, the assembly requires a secure 4661301047: HOUSING II to support the output shaft and a functional 4661301093: TUBE for hydraulic fluid routing. Additionally, a 0631306174: CYLINDRICAL PIN is needed to precisely locate the assembly within the main case. Always verify your transmission model code before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101032 | TRANSMISSION HOUSING | Encloses and supports the gear train and oil sump. |
| 4661301047 | HOUSING II | Rear section housing the output shaft and bearings. |
| 4661301093 | TUBE | Hydraulic line for clutch apply pressure. |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise assembly positioning. |
| 0769123894 | TYPE PLATE | Identification tag with serial and model data. |
| 0750100022 | SCREW PLUG | Seals oil fill or drain ports (M22 thread). |
| 0636302602 | SCREW PLUG | Seals pressure test ports (M14 thread). |
| 0634100633 | O-RING | Seals plug and housing interfaces. |
| 4661301041 | NOZZLE | Sprays lubricant onto planetary gears. |
| 4661301062 | NOZZLE | Sprays lubricant onto clutch packs. |
