Overview
The ZF 4661.004.040 4 WG 94 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly serves as the central power distribution hub within the WG 94 series, managing torque flow from the engine to the driveline through a series of planetary gear sets and hydraulic clutches. The SKU 4661.004.040 integrates the main shaft, clutch packs, and valve body into a single, ready-to-install package, eliminating the need for piecemeal component sourcing. When rebuilding a WG 94 transmission, this complete assembly replaces the worn internal rotating group and is typically mounted inside the TRANSMISSION HOUSING and secured with the HOUSING II to form the sealed gear train enclosure.
Symptoms of Failure
When the ZF 4661.004.040 assembly begins to fail, operators will notice distinct performance degradation. Common failure indicators include:
- Delayed or harsh engagement – The transmission hesitates before engaging forward or reverse gears, often accompanied by a jarring shift as internal clutch clearances exceed tolerances.
- Intermittent gear slippage under load – During grading or loading cycles, the transmission loses torque momentarily, causing the vehicle to lose traction or speed without engine RPM change.
- Contaminated transmission fluid with metallic debris – Oil analysis reveals high levels of bronze or steel particles, indicating bearing or clutch plate wear within the 4661.004.040 assembly.
- Unusual whining or grinding noises – A high-pitched sound from the transmission housing, especially in lower gears, signals planetary gear damage or failed thrust washers inside the unit.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.004.040 |
| Assembly Type | Complete Powershift Unit (4 WG 94) |
| Overall Length | 485 mm (estimated) |
| Overall Diameter | 320 mm (estimated) |
| Dry Weight | 68 kg (estimated) |
| Housing Material | Cast Iron / Steel Alloy |
| OEM Reference | ZF 4661.004.040 |
| Torque Capacity | Up to 940 Nm (estimated) |
Compatibility
The ZF 4661.004.040 assembly is specifically engineered for the WG 94 series of powershift transmissions. Based on its part number structure and physical configuration, this unit is compatible with the following ZF models: WG 94, WG 180, WG 200, and WG 211 series transmissions used in telehandlers, wheel loaders, and industrial tractors. It is also a direct fit for certain variants of the 4 WG 94 and 4 WG 200 models. During installation, ensure the TUBE is properly aligned for lubrication flow, and the CYLINDRICAL PIN is inserted to locate the assembly within the housing bore.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101028 | TRANSMISSION HOUSING | Outer casing that encloses the gear train |
| 4661301049 | HOUSING II | Intermediate housing supporting clutch drums |
| 4661301093 | TUBE | Oil delivery tube for clutch lubrication |
| 0631306174 | CYLINDRICAL PIN | Alignment pin for assembly positioning |
| 0769123894 | TYPE PLATE | Identification plate with serial number |
| 0750100022 | SCREW PLUG | Seals oil passages in the housing |
| 0636302602 | SCREW PLUG | Drain or fill port plug |
| 0634100633 | O-RING | Seals between housing and cover |
| 4661301029 | NOZZLE | Directs oil to clutch packs |
| 4661301027 | NOZZLE | Secondary oil spray nozzle |
