Overview
The ZF 4660.002.031 WG 92 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the core hydraulic and mechanical components of the WG 92 series, providing reliable power distribution in wheel loaders, graders, and industrial tractors. The SKU 4660.002.031 represents a fully assembled unit, ready for direct installation into compatible ZF drivelines. It sits as the central power transfer module, connecting the torque converter to the output drivetrain. For proper sealing and structural integrity, this assembly is often paired with a TRANSMISSION HOUSING and a HOUSING II to enclose the rotating components.
Symptoms of Failure
- Erratic gear engagement under load: When the WG 92 assembly wears, operators often report delayed or harsh shifting, especially when transitioning between forward and reverse. This is a common long-tail search query for “ZF WG92 shifting problems.”
- Hydraulic oil seepage at housing joints: Worn seals within the assembly can cause visible oil leaks around the mating surfaces. Searching for “ZF transmission oil leak at housing” frequently points to this unit.
- Loss of torque converter lockup: A failing assembly may prevent proper torque converter lockup, leading to elevated operating temperatures and reduced fuel efficiency. This symptom is often described as “transmission slipping under heavy load.”
- Unusual whining or grinding noises: Internal bearing or gear wear generates distinct metallic sounds during operation, particularly in neutral or low gear ranges.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4660.002.031 |
| Assembly Type | Complete Powershift Unit (WG 92 Series) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Housing Material | High-strength cast iron |
| Max Input Torque | 920 Nm (679 lb-ft) |
| OEM Reference | ZF 4660.002.031 |
| Seal Type | Viton O-rings & PTFE lip seals |
| Bolt Torque Spec | M12: 80 Nm (59 lb-ft) |
Compatibility
This complete assembly is specifically engineered for the ZF WG 92 transmission series. It is directly compatible with models including the WG180, WG200, and WG92 variants found in construction and agricultural machinery. The unit also fits select ZF 4WG-92 and ZF 6WG-92 configurations. Always verify the bellhousing pattern and output flange dimensions against your existing unit. For auxiliary sealing, the assembly requires a CYLINDRICAL PIN for alignment and a TYPE PLATE for identification purposes.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Main structural enclosure for gear sets |
| 4660301054 | HOUSING II | Secondary housing for clutch pack assembly |
| 0631306174 | CYLINDRICAL PIN | Precision alignment dowel for housing mating |
| 0769123894 | TYPE PLATE | Identification tag with serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports |
| 4660221029 | SUCTION TUBE | Oil pickup from sump to pump |
| 0634100317 | O-RING | Static seal for suction tube connection |
| 0636103273 | CAP SCREW | Fastener for housing retention |
| 0634306311 | O-RING | Dynamic seal for cap screw interface |
| 4660321029 | FIXING PLATE | Locks bearing preload adjustment |
