Overview
The ZF 4661.003.021 4 WG 94 Powershift Transmission Assembly represents a complete, factory-grade replacement unit engineered for heavy-duty off-highway applications. This fully assembled powershift transmission integrates the planetary gear sets, clutch packs, and hydraulic control system into a single, ready-to-install package. Designated under the WG 94 Series, this unit serves as the central power transfer module in wheel loaders, graders, and industrial tractors. The SKU 4661.003.021 distinguishes this complete assembly from individual subcomponents, ensuring you receive a fully validated unit that matches OEM build specifications. It mounts directly to the engine bell housing and interfaces with the torque converter and final drive system.
Symptoms of Failure
When the ZF 4661.003.021 assembly begins to degrade, operators typically notice delayed engagement or gear slipping under load, particularly when shifting from forward to reverse. A second common indicator is erratic or harsh shifting accompanied by abnormal vibration, often caused by worn clutch discs or degraded seals within the hydraulic circuit. Third, external oil leaks around the transmission housing or output flange may appear, signaling compromised gaskets or cracked castings. Finally, overheating transmission fluid with a burnt odor suggests internal friction material failure, requiring immediate replacement of the complete unit to avoid cascading damage to the TRANSMISSION HOUSING.
Technical Specifications
| Parameter | Specification |
|---|---|
| Assembly Weight | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | Cast Iron (GGG-40) |
| Max Input Torque | 1,200 Nm |
| Number of Speeds | 4 Forward / 3 Reverse |
| OEM Reference | ZF 4661.003.021 |
| Fluid Capacity | 12.5 Liters |
Compatibility
This complete powershift transmission assembly is designed for the ZF WG 94 Series, which includes the WG94, WG180, and WG200 transmission models commonly found in construction and agricultural machinery. It directly replaces units in Case, New Holland, and JCB wheel loaders, as well as Volvo and Caterpillar graders. The assembly is also compatible with ZF 4WG-94 and 4WG-200 variants. For proper installation, ensure the HOUSING II and TUBE components are correctly aligned. The CYLINDRICAL PIN must be inserted to secure the housing alignment during final assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101031 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4661301046 | HOUSING II | Secondary housing for clutch pack assembly |
| 4661301093 | TUBE | Hydraulic fluid passage conduit |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification and specification label |
| 0750100022 | SCREW PLUG | Sealing plug for oil drain port |
| 0636302602 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0634100633 | O-RING | Hydraulic seal for plug and housing joints |
| 4661301041 | NOZZLE | Lubrication spray nozzle for gear mesh |
| 4661301038 | NOZZLE | Coolant flow nozzle for clutch pack |
