Overview
The ZF 4661.044.006 3 WG 94 Powershift Transmission Assembly | Complete Unit is a fully integrated, factory-assembled gearbox core designed for heavy-duty off-highway machinery. This complete unit serves as the primary power transfer module within the WG 94 series, converting engine torque into controlled, multi-speed output for wheel loaders, graders, and industrial tractors. The SKU 4661.044.006 identifies a direct replacement assembly that includes all internal clutches, shafts, and planetary gear sets. It mounts directly to the 4661101039: TRANSMISSION HOUSING and mates with the 4661301109: HOUSING II to form the sealed driveline envelope. Precision alignment is ensured by the 0631306174: CYLINDRICAL PIN, while the 0769123894: TYPE PLATE provides critical identification for service verification.
Symptoms of Failure
- Delayed or harsh gear engagement: When the complete unit wears, internal clutch pack clearances increase, causing noticeable lag or jarring shifts during direction changes.
- Transmission fluid contamination with metallic debris: Worn planetary gears or bearing surfaces shed particles into the oil, visible as glitter or sludge on the dipstick.
- Intermittent power loss under load: Slipping clutches within the assembly fail to hold torque, resulting in reduced wheel speed or engine flare-up during heavy digging.
- External oil seepage at housing joints: Fatigue cracks or gasket degradation in the main body allow fluid to weep around the TRANSMISSION HOUSING interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.044.006 |
| Assembly Type | Complete Powershift Unit (3 WG 94) |
| Overall Length | ~620 mm |
| Overall Width | ~380 mm |
| Overall Height | ~420 mm |
| Dry Weight | ~145 kg (320 lbs) |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4661.044.006 |
| Seal Type | Viton radial shaft seals |
| Max Input Torque | ~1,200 Nm |
Compatibility
This complete unit is engineered for the ZF WG 94 series of powershift transmissions. It is directly compatible with the following ZF models: WG180, WG200, WG210, and WG220. These transmissions are commonly found in articulated dump trucks, wheel loaders, and heavy forklifts from manufacturers such as Volvo, Case, and JCB. Always verify the serial number and housing casting marks before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101039 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301109 | HOUSING II | Rear section housing output shaft and bearings |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for housing-to-housing mating |
| 0769123894 | TYPE PLATE | Identification tag with model and serial number |
| 0750100022 | SCREW PLUG | Oil drain port sealing plug |
| 4660201008 | SCREW PLUG | Pressure test port plug |
| 0636100117 | SCREW PLUG | Filter housing access plug |
| 0501211384 | VALVE | Modulating pressure control valve |
| 0732042156 | COMPRESSION SPRING | Valve return spring for clutch modulation |
| 0768409154 | SCREW PLUG | High-pressure gallery sealing plug |
