Overview
The ZF 4661.003.017 4 WG 94 Powershift Transmission Assembly is a complete, fully assembled unit designed for heavy-duty off-highway machinery. This complete unit integrates the core hydraulic and mechanical components of the WG 94 series, serving as the primary power distribution hub within the drivetrain. The SKU 4661.003.017 denotes a factory-matched assembly, ensuring precise clutch pack clearances and valve body timing. It sits directly between the torque converter and the output shaft housing, managing gear engagement under load. For optimal sealing and structural integrity, this assembly mates directly with the 4661101031: TRANSMISSION HOUSING and the 4661301046: HOUSING II, which contain the main shaft bearings and oil galleries.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, internal clutch piston seals degrade, causing a noticeable lag when shifting from neutral to forward or reverse. This often manifests as a “clunk” under heavy load.
- Erratic shift patterns and gear slipping: Worn valve body spools or fatigued springs within the 4661.003.017 unit lead to inconsistent hydraulic pressure, resulting in the transmission slipping out of gear during uphill operation.
- External oil seepage at the main case joint: Cracks or warpage in the assembly body allow transmission fluid to weep past the 0631306174: CYLINDRICAL PIN alignment bores, leaving visible drips on the bell housing.
- Metallic debris in the oil pan: Internal bearing race spalling or clutch plate disintegration generates fine metallic particles, often accompanied by a high-pitched whine during deceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Assembly Weight | 68 kg (149.9 lbs) |
| Overall Length | 420 mm |
| Overall Width | 340 mm |
| Overall Height | 290 mm |
| Primary Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4661.003.017 |
| Bolt Torque Spec (Main Case) | 120 Nm |
Compatibility
This complete unit is engineered exclusively for the ZF WG 94 series of powershift transmissions. It is a direct fit for the WG 94, WG 98, and WG 100 models commonly found in telescopic handlers, wheel loaders, and agricultural tractors. While the assembly shares mounting patterns with the WG 180 and WG 200 series, the internal clutch count and valve body configuration differ; therefore, the 4661.003.017 is not cross-compatible with those larger frames without significant modification. Always verify the transmission serial number against the original equipment manufacturer (OEM) build sheet before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101031 | TRANSMISSION HOUSING | Encloses the main shaft and clutch packs; provides mounting points for the valve body. |
| 4661301046 | HOUSING II | Supports the output shaft bearing and houses the PTO drive gear. |
| 4661301093 | TUBE | Routes pressurized oil from the pump to the clutch control valves. |
| 0631306174 | CYLINDRICAL PIN | Aligns the housing halves precisely to prevent oil leaks and gear misalignment. |
| 0769123894 | TYPE PLATE | Identifies the transmission model and serial number for service verification. |
| 0750100022 | SCREW PLUG | Seals the main pressure test port on the valve body. |
| 0636302602 | SCREW PLUG | Closes the drain port in the lower sump area. |
| 0634100633 | O-RING | Provides a hydraulic seal between the tube and the housing bore. |
| 4661301041 | NOZZLE | Controls lubrication flow to the forward clutch pack. |
| 4661301038 | NOZZLE | Directs cooling oil to the reverse clutch pack. |
