Overview
The ZF 4660.002.019 WG 92 Powershift Transmission Assembly is a complete, factory-matched unit engineered for heavy-duty off-highway applications. As the core drivetrain component in the WG 92 Series, this assembly integrates the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. The SKU 4660.002.019 is designed to restore original ZF performance in wheel loaders, forklifts, and industrial vehicles, eliminating the need for piecemeal repairs. This complete unit replaces the worn internal components while maintaining the precise gear ratios and clutch engagement characteristics specified by ZF. When installed, it interfaces directly with the 4660101015: TRANSMISSION HOUSING and the 4660301054: HOUSING II to form a sealed, pressurized hydraulic circuit.
Symptoms of Failure
- Erratic shifting or gear slippage under load: When the internal clutch packs or valve body wear out, the transmission fails to hold pressure, causing the machine to lose power during digging or lifting cycles.
- Delayed engagement when shifting from neutral to forward/reverse: A worn torque converter or worn seals within the assembly cause a noticeable lag before the vehicle moves, often accompanied by a low hydraulic whine.
- External oil leaks at the housing mating surfaces: Cracks or warpage in the main casing force fluid past the gaskets, leading to low oil levels and eventual overheating of the entire unit.
- Contaminated transmission fluid with metallic debris: Internal gear wear or bearing failure produces fine metal particles in the oil, visible during routine fluid changes, indicating imminent total failure.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4660.002.019 |
| Assembly Type | Complete Powershift Transmission (WG 92 Series) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4660.002.019 |
| Max Input Torque | 920 Nm |
| Fluid Capacity | 12.5 liters (ZF TE-ML 03 spec) |
Compatibility
This complete unit is specifically designed for the ZF WG 92 Series powershift transmissions. It is a direct replacement for models including the WG180, WG200, and WG92 variants commonly found in industrial loaders and telehandlers. The assembly also fits select ZF 4WG-200 and 4WG-180 configurations used in agricultural tractors. Always verify your transmission serial number against the original equipment manufacturer’s specifications. For proper installation, ensure the 0631306174: CYLINDRICAL PIN is correctly aligned during mounting, and affix the new 0769123894: TYPE PLATE to the housing for future identification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4660101015 | TRANSMISSION HOUSING | Main structural casing that encloses the gear train and hydraulic valves. |
| 4660301054 | HOUSING II | Secondary housing section that supports the output shaft and PTO drive. |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise mating of housing halves during assembly. |
| 0769123894 | TYPE PLATE | Identification plate stamped with transmission model and serial number. |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports and drain holes in the transmission casing. |
| 4660221029 | SUCTION TUBE | Draws oil from the sump to the pump inlet for lubrication. |
| 0634100317 | O-RING | Static seal between the suction tube and housing flange. |
| 0636103273 | CAP SCREW | High-tensile fastener securing the housing halves together. |
| 0634306311 | O-RING | Seal for the cap screw bore to prevent external oil leakage. |
| 4660321029 | FIXING PLATE | Locks the adjusting nut on the output shaft bearing. |
