Overview
The ZF 4661.003.006 4 WG 94 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready gearbox designed for heavy-duty off-highway machinery. As a core component of the WG 94 Series, this complete unit integrates the main drive housing, clutch packs, and planetary gear sets to deliver reliable torque conversion and smooth directional shifting. The SKU 4661.003.006 identifies a factory-spec assembly that replaces the entire transmission core, eliminating the need for piecemeal rebuilds. This unit sits directly between the engine bell housing and the output driveline, serving as the primary power transfer module in loaders, graders, and industrial tractors.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears internally, operators experience a noticeable lag between shifting and gear engagement, often accompanied by a jarring clunk. This indicates worn clutch discs or degraded seals within the unit.
- Transmission fluid contamination: A common failure sign is dark, burnt-smelling oil or metallic debris in the sump. This points to internal component fatigue, often originating from the planetary gear sets or the TRANSMISSION HOUSING cracking under stress.
- Loss of power under load: If the machine struggles to maintain speed on inclines or during heavy digging, the complete unit may have internal slippage. This is frequently linked to worn clutch packs or a damaged HOUSING II that misaligns the shaft bearings.
- External oil seepage: Visible drips around the bell housing or output flange indicate seal failure. Leaks often originate from the CYLINDRICAL PIN bores or the TUBE connections that route pressurized fluid through the assembly.
Technical Specifications
| Specification | Value |
|---|---|
| OEM Part Number | 4661.003.006 |
| Assembly Type | 4 WG 94 Powershift (Complete Unit) |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Input Torque Capacity | Up to 1,200 Nm |
| OEM Reference | ZF WG 94 Series |
Compatibility
This complete unit is engineered specifically for the ZF WG 94 Series of powershift transmissions. It is a direct fit for models including the WG180, WG200, and WG211, which are commonly deployed in articulated dump trucks, wheel loaders, and heavy forklifts. The assembly also cross-references with earlier 4 WG 92 variants where the housing bolt pattern matches. Always verify the bell housing alignment and output flange configuration before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101018 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and supports input/output shafts. |
| 4661301050 | HOUSING II | Secondary housing section that houses the clutch packs and valve body passages. |
| 4661301093 | TUBE | Hydraulic fluid conduit that directs pressurized oil to the clutch pistons. |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel that precisely locates housing sections during assembly. |
| 0769123894 | TYPE PLATE | Identification tag riveted to the housing for model and serial number verification. |
| 0750100022 | SCREW PLUG | Sealing plug for oil drain or pressure test ports on the housing. |
| 0636302602 | SCREW PLUG | Magnetic drain plug that captures ferrous wear particles from the oil sump. |
| 0634100633 | O-RING | Elastomeric seal used at housing joints and plug interfaces to prevent leaks. |
| 4661301029 | NOZZLE | Lubrication jet that sprays oil onto planetary gears for cooling and wear reduction. |
| 4661301027 | NOZZLE | Secondary oil nozzle directing flow to the clutch drum bearings. |
