Overview
The ZF 4661.001.010 4 WG 90 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly serves as the core power transfer module within the WG 90 series, integrating the clutch packs, planetary gearsets, and hydraulic control circuits into a single, ready-to-install package. The SKU 4661.001.010 is a direct replacement for worn or failed assemblies, ensuring that your equipment regains full torque capacity and shift precision. It mounts directly between the engine bellhousing and the final drive, with critical interfaces connecting to the TRANSMISSION HOUSING and the HOUSING II to form a sealed, pressurized oil circuit.
Symptoms of Failure
- Erratic or delayed shifting under load: When the internal clutch discs or seals degrade, you may experience hesitation or harsh engagement, especially when transitioning from forward to reverse.
- Low hydraulic pressure and overheating: A failing assembly often causes internal leakage, leading to a drop in line pressure and elevated transmission oil temperatures above 120°C.
- Metallic debris in the oil filter: Worn bearings or gear teeth within the 4661.001.010 will shed fine metal particles, which can be detected during routine oil sampling or filter inspection.
- Oil seepage at the housing joint: Cracks or gasket failures in the assembly can cause fluid to weep from the seam between the unit and the CYLINDRICAL PIN alignment bores.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4661.001.010 |
| Assembly Type | 4 WG 90 Powershift Transmission (Complete) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 900 Nm |
| OEM Reference | ZF 4661.001.010 |
| Oil Capacity (assembly) | 12.5 liters |
| Seal Type | Viton O-rings & PTFE lip seals |
Compatibility
This complete assembly is engineered for the ZF WG 90 series powershift transmissions. It is directly compatible with the following models: WG 90, WG 92, WG 94, and WG 96. It also fits select variants of the WG 180 and WG 200 series when used in telehandlers and wheel loaders with a 4-speed configuration. Always verify the serial number plate on your existing unit before ordering. The assembly interfaces with the TUBE for oil routing and the CYLINDRICAL PIN for precise alignment during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101031 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and oil sump. |
| 4661301046 | HOUSING II | Secondary housing that supports the output shaft and PTO drive. |
| 4661301093 | TUBE | Hydraulic oil feed tube connecting the pump to the valve body. |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise mating of housing halves. |
| 0769123894 | TYPE PLATE | Identification plate with serial number and model data. |
| 0750100022 | SCREW PLUG | Magnetic drain plug for oil pan. |
| 0636302602 | SCREW PLUG | Hex head plug for pressure test ports. |
| 0634100633 | O-RING | Seal for hydraulic line connections. |
| 4661301041 | NOZZLE | Lubrication jet for planetary gearset. |
| 4661301038 | NOZZLE | Cooling nozzle for clutch pack. |
