Overview
The ZF 4661.044.020 3 WG 94 Powershift Transmission Assembly represents a complete, factory-grade unit engineered for heavy-duty industrial drivelines. This fully assembled gearbox integrates the core shifting mechanism, planetary gear sets, and hydraulic control components into a single ready-to-install package. As a direct replacement for the WG 94 series, the SKU 4661.044.020 sits at the heart of the transmission system, managing torque distribution and clutch engagement across all forward and reverse speeds. This assembly is precision-balanced to eliminate vibration and ensure seamless power flow under extreme loads, making it critical for wheel loaders, forklifts, and material handlers.
Symptoms of Failure
- Delayed or harsh gear engagement: When the internal clutch packs or hydraulic circuits wear, operators experience a noticeable lag or jarring shift between forward and reverse gears.
- Transmission fluid contamination: Friction material shedding from worn components turns the oil dark or metallic, often accompanied by a burnt odor during operation.
- Intermittent power loss under load: The unit may slip or fail to hold torque when climbing grades or lifting heavy payloads, indicating internal seal or piston failure.
- External oil seepage at housing joints: Cracks or gasket degradation around the main casing allow fluid to escape, leading to low pressure and eventual transmission shutdown.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4661.044.020 |
| Assembly Type | Complete Powershift Unit (3 WG 94) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 410 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Max Input Torque | 1,200 Nm |
| OEM Reference | ZF WG 94 Series |
Compatibility
This complete assembly is specifically designed for the ZF WG 94 transmission family, which includes models such as the WG180, WG200, and WG220. It also fits select variants of the WG 92 and WG 96 series used in off-highway vehicles. Always verify the serial number on your existing unit against the SKU 4661.044.020 to confirm direct interchangeability. For housing integrity, pair this unit with a new TRANSMISSION HOUSING and the HOUSING II to prevent misalignment. Secure the assembly using the CYLINDRICAL PIN for precise dowel alignment, and affix the TYPE PLATE for proper identification after installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101042 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301108 | HOUSING II | Secondary housing covering clutch and valve sections |
| 0631306174 | CYLINDRICAL PIN | Dowel pin for precise housing alignment |
| 0769123894 | TYPE PLATE | Identification plate with serial and model data |
| 0750100022 | SCREW PLUG | Seals oil passages and drain ports |
| 4660201008 | SCREW PLUG | High-pressure port sealing plug |
| 0636100117 | SCREW PLUG | Magnetic drain plug for debris collection |
| 0501211384 | VALVE | Hydraulic control valve for clutch modulation |
| 0732042156 | COMPRESSION SPRING | Returns valve spools to neutral position |
| 0768409154 | SCREW PLUG | Low-pressure gallery sealing plug |
