Overview
The ZF 4661.004.047 4 WG 94 Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway applications. This assembly integrates the core hydraulic and mechanical components required for seamless gear engagement in ZF’s WG 94 series. The SKU 4661.004.047 serves as the central power distribution hub, managing torque flow from the engine to the driveline. It is designed to be mounted directly onto the 4661101028: TRANSMISSION HOUSING, which provides structural support and oil containment. The assembly also interfaces with the 4661301049: HOUSING II to enclose the clutch packs and valve body, ensuring precise hydraulic pressure regulation during shifting.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or seals degrade, the transmission may hesitate or fail to hold a gear, especially during uphill operation or heavy hauling.
- External oil seepage near the bell housing: Worn gaskets or cracked castings in the assembly can cause ATF to leak, leaving puddles under the vehicle and reducing hydraulic pressure.
- Delayed forward or reverse engagement: A failing valve body or worn piston seals within the 4661.004.047 unit can create a lag of several seconds before the transmission responds to gear selection.
- Unusual whining or grinding noises: Metal debris from worn bearings or planetary gears inside the assembly often produces a high-pitched whine that increases with engine RPM.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4661.004.047 |
| Assembly Type | Complete Powershift Unit (4 WG 94) |
| Dry Weight | ~185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4 WG 94 |
| Max Input Torque | 1,200 Nm |
| Fluid Capacity (assembly) | 12.5 liters |
Compatibility
This complete unit is specifically designed for the ZF WG 94 series of powershift transmissions. It is directly compatible with the following ZF models: WG94, WG180 (early variants with 4-speed configuration), and WG200 (when used with the appropriate bell housing adapter). The assembly also fits select ZF 4WG-94 applications found in agricultural tractors, wheel loaders, and telehandlers from manufacturers such as Claas, JCB, and Liebherr. Always verify the bell housing pattern and input shaft spline count against your existing unit before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101028 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301049 | HOUSING II | Secondary housing enclosing clutch pack assembly |
| 4661301093 | TUBE | Hydraulic fluid passage between valve body and clutch |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0769123894 | TYPE PLATE | Identification tag with serial number and specs |
| 0750100022 | SCREW PLUG | M18 drain plug for oil pan access |
| 0636302602 | SCREW PLUG | M12 pressure test port plug |
| 0634100633 | O-RING | Seal for housing joint faces |
| 4661301029 | NOZZLE | Lubrication jet for planetary gear set |
| 4661301027 | NOZZLE | Cooling spray nozzle for clutch pack |
