Overview
The ZF 4661.004.050 4 WG 94 Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway machinery. This assembly integrates the main drive components within the WG 94 series, serving as the central power distribution hub for torque conversion and gear shifting. The SKU 4661.004.050 replaces worn or failed assemblies, restoring full hydraulic clutch engagement and driveline integrity. It sits directly between the engine bellhousing and the output drivetrain, interfacing with the TRANSMISSION HOUSING and the HOUSING II to form a sealed, pressurized oil circuit.
Symptoms of Failure
- Delayed or harsh gear engagement: When the assembly wears, hydraulic pressure drops, causing noticeable lag or jarring shifts during forward/reverse operation.
- Internal oil leaks near the clutch pack: Worn seals within the 4661.004.050 allow transmission fluid to bypass, leading to puddling under the bellhousing or a persistent low-oil warning.
- Torque converter shudder under load: A failing unit produces vibration or slipping when the machine is under heavy pull, especially at low RPMs.
- Erratic shift patterns or neutral creep: Degraded valve body components cause unintended gear disengagement or slow clutch pack release.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4661.004.050 |
| Assembly Type | Complete Powershift Transmission Unit |
| Series | WG 94 |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Housing Material | High-strength cast iron |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| OEM Reference | ZF 4661.004.050 |
| Fluid Capacity | 12.5 L (approx.) |
| Max Input Torque | 1,200 Nm |
Compatibility
This complete unit is designed for the ZF WG 94 series of powershift transmissions. It is directly compatible with models including the WG94, WG98, and WG100. The assembly also fits select variants of the WG180 and WG200 when used with the appropriate TUBE and CYLINDRICAL PIN kits. Always verify your transmission serial number against the 4661.004.050 specification before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101023 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301051 | HOUSING II | Secondary housing for clutch pack and valve body |
| 4661301093 | TUBE | Hydraulic fluid passage between housing sections |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0769123894 | TYPE PLATE | Identification label with serial number |
| 0750100022 | SCREW PLUG | Seals oil drain or test ports |
| 0636302602 | SCREW PLUG | Secondary sealing plug for pressure ports |
| 0634100633 | O-RING | Hydraulic seal between mating surfaces |
| 4661301029 | NOZZLE | Oil spray nozzle for gear lubrication |
| 4661301027 | NOZZLE | Secondary oil jet for clutch cooling |
