Overview
This complete ZF 4642.056.021 6 WG 150 Powershift Transmission Assembly represents a fully integrated drop-in solution for heavy-duty off-highway machinery. As a core component of the WG 150 series, this unit houses the complete gear train, hydraulic control system, and torque converter in a single assembly. The SKU 4642.056.021 is specifically engineered to manage high torque loads in articulated dump trucks, wheel loaders, and industrial graders. When installed, it replaces the entire transmission housing and internal rotating components, restoring full power flow from the engine to the driveline. This assembly eliminates the need for piecemeal repairs by providing a factory-balanced unit with all clutches, seals, and planetary gears pre-installed.
Symptoms of Failure
When the ZF 4642.056.021 assembly begins to degrade, operators typically notice these specific failure indicators:
- Delayed engagement or gear slipping under load – Worn clutch packs within the 6 WG 150 cause hesitation when shifting from forward to reverse, particularly during uphill operation.
- External oil leaks at the PTO or converter housing – Deteriorating shaft seals on the 4642.056.021 unit allow ATF to weep onto the bell housing, leaving visible puddles after shutdown.
- Erratic shift patterns or harsh engagement – Internal valve body wear leads to pressure spikes, resulting in jarring shifts that can damage driveline components.
- Overheating during continuous operation – A failing torque converter stator or blocked cooler passages within this assembly cause transmission fluid temperatures to exceed 120°C under normal loads.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4642.056.021 |
| Series | WG 150 (6-speed powershift) |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 785 mm |
| Overall Width | 610 mm |
| Overall Height | 540 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Input Torque Capacity | 1,500 Nm (peak) |
| Fluid Capacity | 28 liters (ZF TE-ML 03 spec) |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This 4642.056.021 assembly is designed exclusively for the ZF WG 150 transmission family. While the WG 150 shares mounting patterns with the WG 180 and WG 200 series, the internal gear ratios and clutch count differ. Direct fitment applies to the following ZF models:
- ZF 6 WG 150 (all sub-variants using the 4642 prefix)
- ZF WG 150 Ecomat (early electronic control versions)
- ZF WG 150 with integrated retarder (non-ABS variants)
Note: This unit does not cross to WG 180 or WG 200 without significant adapter plate modifications. Always verify the transmission serial number against the 4642.056.021 casting number before ordering.
