Overview
The ZF 4642.054.012 4 WG 150(500/4) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the torque converter, clutch packs, and planetary gear sets into a single, ready-to-install package. As the core of the WG 150 Series, it manages power distribution from the engine to the driveline, enabling smooth, clutchless shifting under full load. The SKU 4642.054.012 specifically denotes a 4-speed forward, 4-speed reverse configuration with a 500-series torque converter, optimized for loaders, graders, and material handlers. This unit replaces worn or failed assemblies, restoring original machine performance and reducing downtime.
Symptoms of Failure
When the ZF 4642.054.012 assembly begins to degrade, operators typically notice these distinct failure modes:
- Erratic or delayed gear engagement: A pronounced lag when shifting from neutral to forward or reverse, often accompanied by a harsh clunk. This points to worn clutch pack seals or degraded valve body function.
- Torque converter shudder under load: A low-frequency vibration or chatter when the machine is under heavy load, especially at low speeds. This indicates failing stator bearings or worn turbine splines within the converter section.
- External oil seepage at the PTO cover: Visible hydraulic fluid leaks around the power take-off (PTO) housing or the main case split line. This is a classic sign of degraded O-rings or a cracked housing, often triggered by thermal cycling.
- Intermittent loss of drive in specific gears: The machine may move in first gear but fail to engage second or third, or it may slip under load. This suggests a failed clutch piston seal or a blocked oil passage within the planetary carrier.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number / SKU | 4642.054.012 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 150 (4 WG 150 variant) |
| Speed Configuration | 4 Forward / 4 Reverse |
| Torque Converter Size | 500/4 (500 mm diameter, 4-element) |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Housing Material | High-tensile cast iron (GGG-40) |
| Input Torque Capacity | 1,200 Nm (885 lb-ft) max |
| OEM Reference | ZF 4642.054.012 / 0501.301.001 |
| Fluid Capacity | 28 liters (7.4 US gal) of ZF TE-ML 03 fluid |
Compatibility
This 4642.054.012 assembly is engineered for the ZF WG 150 Series transmission family. It is directly compatible with the following models and their derivatives:
- ZF WG 150 (4 WG 150) – Primary application for this SKU.
- ZF WG 180 – Shares the same bolt pattern and input shaft spline count (though output flange may differ).
- ZF WG 200 – Compatible with adapter plate modifications for higher torque applications.
- ZF 4 WG 150 – Direct drop-in replacement for earlier 4-speed variants.
Always verify the bellhousing pattern (SAE 3 or SAE 4) and the PTO configuration before installation. This unit is commonly used in Volvo L70/L90 loaders, Case 821/921 graders, and Kramer 5000 telehandlers.
