Overview
The ZF 4646.004.054 4 WG 250(2) ERGOPOWER Transmission Assembly is a complete, factory-matched unit designed for heavy-duty industrial powertrains. This assembly integrates the main gear cluster, clutch pack, and hydraulic control components into a single, ready-to-install package. As a core element of the WG 250 Series, it manages torque distribution across four forward speeds and one reverse gear, ensuring smooth power delivery under high load conditions. The SKU 4646.004.054 is a direct OEM replacement that eliminates the need for partial rebuilds, reducing downtime for fleet operators and equipment service centers.
Symptoms of Failure
When the ZF 4646.004.054 assembly begins to fail, operators typically notice erratic gear engagement during low-speed maneuvering, often accompanied by a delayed shift from neutral to drive. Another common indicator is progressive hydraulic oil seepage around the main case seam, which can lead to low fluid levels and subsequent overheating. In advanced wear stages, audible whining or grinding noises from the planetary gear set become apparent under load, particularly in second and third gears. Finally, intermittent loss of forward drive after extended operation—often misdiagnosed as a pump issue—points directly to internal clutch pack degradation within this assembly.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4646.004.054 |
| Assembly Type | Complete ERGOPOWER Unit |
| Dry Weight | 48.5 kg (107 lbs) |
| Housing Material | Aluminum Alloy (EN AC-46000) |
| Overall Length | 485 mm |
| Bolt Torque Spec | 85 Nm (main housing bolts) |
| Fluid Capacity | 4.2 liters (ZF TE-ML 03 spec) |
| Max Input Torque | 250 Nm |
| OEM Reference | ZF 4 WG 250(2) |
Compatibility
This assembly is specifically engineered for the ZF WG 250 Series transmission family. It is a direct fit for the ZF WG180, WG200, and WG250 models used in forklifts, telehandlers, and airport ground support equipment. The unit also cross-references with certain ZF 4WG-200 and 4WG-250 variants found in agricultural tractors. For proper installation, ensure the 4646101040: TRANSMISSION HOUSING is free of cracks and that the 4646301090: HOUSING mating surfaces are clean. The 4646301240: COVER must be torqued evenly using 0636015304: HEXAGON SCREW fasteners to prevent fluid bypass.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101040 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4646301090 | HOUSING | Secondary housing for clutch pack |
| 4646301240 | COVER | Seals the valve body section |
| 0636015304 | HEXAGON SCREW | M10 fastener for housing joints |
| 0636101828 | CAP SCREW | M8 bolt for cover retention |
| 4646301102 | COVER SHEET | Thin gasket plate for oil channels |
| 4646301098 | COVER SHEET | Lower profile sealing plate |
| 0730365067 | TYPE PLATE | Identification tag with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for housing |
| 0636101193 | CAP SCREW | M6 bolt for accessory mounting |
