Overview
This is the ZF 4642.056.003 6 WG 150 Powershift Transmission Assembly, a complete drop-in unit engineered for heavy-duty industrial applications. As a fully assembled gearbox, it integrates the torque converter, clutch packs, and hydraulic controls into a single, ready-to-install package. The SKU 4642.056.003 sits at the core of the drivetrain, converting engine power into controlled, multi-speed output for loaders, graders, and material handlers. This complete assembly eliminates the need for piecemeal rebuilding, offering a direct replacement for worn-out units in the WG 150 series.
Symptoms of Failure
When this ZF 4642.056.003 assembly begins to degrade, operators will notice distinct operational issues. Identifying these signs early can prevent catastrophic driveline damage.
- Delayed or harsh engagement: A noticeable lag when shifting from neutral to forward or reverse, often accompanied by a jarring clunk. This indicates worn clutch discs or degraded hydraulic pressure within the unit.
- Intermittent gear slippage under load: The transmission loses power momentarily while climbing grades or pushing heavy material, causing the engine RPM to spike without a corresponding increase in wheel speed. This is a classic sign of failing seals or piston wear inside the assembly.
- External oil seepage from bell housing: Persistent fluid leaks around the torque converter area or output shaft seal, leaving puddles under the machine. This points to seal degradation or housing cracks in the complete unit.
- Overheating transmission fluid: The hydraulic oil temperature rises rapidly during normal operation, often triggering warning lights. This can stem from internal clutch pack slippage or a failing torque converter stator within the assembly.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4642.056.003 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 150 |
| Number of Speeds | 6 Forward / 3 Reverse (6 WG) |
| Dry Weight (Approx.) | 340 kg (750 lbs) |
| Housing Material | High-strength cast iron |
| Torque Converter | Single-stage, integrated |
| OEM Reference | ZF 4642.056.003 |
Compatibility
This complete assembly is specifically designed for the ZF WG 150 transmission series. While the WG 150 is a distinct model, its architecture shares hydraulic and mechanical principles with other ZF powershift families. The 4642.056.003 unit is a direct fit for equipment originally equipped with a WG 150 gearbox. For cross-reference purposes, related ZF series that use similar internal components (though not identical housings) include:
- ZF WG 180 – Shares clutch pack design but differs in torque converter size.
- ZF WG 200 – Uses a similar valve body layout but has a higher torque capacity.
- ZF 4 WG 150 – A 4-speed variant of the same series; the 6-speed unit (6 WG) is a direct upgrade path.
Always verify the original equipment manufacturer (OEM) tag on your machine to confirm the WG 150 series designation before installation.
