Overview
The ZF 4661.003.015 4 WG 94 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main drive components, clutch packs, and hydraulic control elements into a single, ready-to-install package. As the core of the WG 94 series, it manages torque distribution across four forward and reverse speeds. The SKU 4661.003.015 identifies this as a complete assembly, ensuring direct replacement without the need for sub-component matching. It sits between the engine bell housing and the final drive, acting as the primary power modulation interface.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or valve body wear, the transmission may hesitate or fail to hold gear under heavy torque, often accompanied by a burning smell from overheated friction material.
- External oil seepage from the main case joints: Deterioration of seals between the TRANSMISSION HOUSING and the HOUSING II leads to visible fluid trails, particularly after the unit reaches operating temperature.
- Delayed or harsh shift cycling: A failing assembly often produces a noticeable lag when shifting from forward to reverse, or a jarring engagement that indicates internal pressure loss or worn spool valves.
- Unusual metallic grinding from the gear train: This symptom points to bearing fatigue or misalignment within the main shaft assembly, often worsened by a damaged CYLINDRICAL PIN that secures the planetary carrier.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.003.015 |
| Assembly Type | Complete Powershift Unit (4 WG 94) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| OEM Reference | ZF 4 WG 94 Series |
| Torque Capacity (max) | 1,200 Nm |
| Oil Capacity | 14.5 liters (approx.) |
Compatibility
This complete assembly is engineered specifically for the ZF WG 94 transmission family. It is a direct fit for the WG 94, WG 98, and WG 100 series used in telescopic handlers, wheel loaders, and rough-terrain forklifts. The unit is also compatible with select WG 180 and WG 200 models that share the same bell housing bolt pattern and input shaft spline count, though verification of the TUBE length is recommended for those variants. It replaces all earlier 4 WG 92 and 4 WG 93 assemblies without modification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101017 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4661301048 | HOUSING II | Rear section housing the output shaft and PTO drive |
| 4661301093 | TUBE | Internal lubrication feed tube for clutch pack cooling |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0769123894 | TYPE PLATE | Identification plate with serial number and specs |
| 0750100022 | SCREW PLUG | Magnetic drain plug for oil sump |
| 0636302602 | SCREW PLUG | Vent plug for pressure equalization |
| 0634100633 | O-RING | Seal for housing joint and plug interfaces |
| 4661301029 | NOZZLE | Lubrication jet for planetary gear set |
| 4661301027 | NOZZLE | Lubrication jet for clutch pack |
