Overview
The ZF 4661.004.052 4 WG 94 Powershift Transmission Assembly represents a complete, factory-grade replacement unit engineered for heavy-duty off-highway applications. This fully assembled gearbox integrates the planetary gear sets, clutch packs, and hydraulic control system into a single ready-to-install package. As the core of the WG 94 series, this assembly governs torque distribution across four forward and reverse speeds. The SKU 4661.004.052 is precision-machined to OEM tolerances, ensuring seamless integration with existing driveline components. When paired with a robust TRANSMISSION HOUSING, this unit provides the structural foundation for reliable power transfer in loaders, graders, and industrial tractors.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: Worn clutch discs or degraded seals inside the assembly cause hesitation when selecting forward or reverse, often accompanied by a grinding noise during cold starts.
- Hydraulic oil contamination with metallic particles: Internal bearing or gear wear generates fine metal shavings that circulate through the system, visible as glitter in the oil filter or dipstick.
- Torque converter lockup failure: A failing assembly may prevent the torque converter from locking at highway speeds, resulting in excessive heat buildup and a 15-20% drop in fuel efficiency.
- External oil seepage from the bell housing: Cracks in the CYLINDRICAL PIN bores or gasket degradation allow transmission fluid to leak past the main case, leaving puddles under the vehicle.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4661.004.052 |
| Assembly Type | Complete Powershift Transmission |
| Dry Weight | 285 kg (628 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | Cast Iron EN-GJS-500-7 |
| Max Input Torque | 1,200 Nm |
| Oil Capacity | 22 liters |
| OEM Reference | ZF 4 WG 94 |
Compatibility
This complete unit is designed exclusively for the ZF WG 94 series, which includes the WG94, WG94-2, and WG94-3 variants. It is not interchangeable with the larger WG180 or WG200 series due to differences in bell housing bolt patterns and input shaft spline counts. However, the internal clutch pack and planetary gear geometry are shared with the WG 92 series. For proper installation, ensure the HOUSING II and the TUBE are inspected for wear, as these components directly affect oil flow to the rotating clutches.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101028 | TRANSMISSION HOUSING | Main structural case enclosing gear sets |
| 4661301049 | HOUSING II | Rear cover supporting output shaft bearings |
| 4661301093 | TUBE | Oil supply conduit to clutch packs |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating surfaces |
| 0769123894 | TYPE PLATE | Identification tag with serial number |
| 0750100022 | SCREW PLUG | Magnetic drain plug for oil pan |
| 0636302602 | SCREW PLUG | Hexagonal fill plug with sealing washer |
| 0634100633 | O-RING | Hydraulic seal for tube connections |
| 4661301029 | NOZZLE | Lubrication jet for planetary gears |
| 4661301027 | NOZZLE | Coolant spray nozzle for clutch discs |
