Overview
This complete ZF 4644.036.206 6 WG 201 Powershift Transmission Assembly is a fully integrated drop-in unit designed for heavy-duty off-highway machinery. As a core component of the WG 201 series, this assembly manages torque distribution across six forward speeds, enabling seamless gear changes under full load. The SKU 4644.036.206 represents a factory-spec complete unit, including the torque converter, clutch packs, and hydraulic control system, ready for direct installation into compatible equipment. It serves as the primary power transfer module between the engine and driveline in wheel loaders, graders, and industrial tractors.
Symptoms of Failure
When the ZF 4644.036.206 assembly begins to degrade, operators will notice distinct operational issues. Recognizing these symptoms early can prevent catastrophic driveline damage.
- Erratic gear engagement under load: The transmission hesitates or slams into gear when shifting from forward to reverse, indicating worn clutch discs or hydraulic pressure loss within the unit.
- Torque converter shudder at low RPM: A pronounced vibration during initial acceleration suggests internal wear on the stator or turbine components, often accompanied by elevated transmission fluid temperatures.
- External oil seepage from the bell housing: Fluid leaks around the pump seal or converter hub area signal a compromised seal, leading to low oil levels and eventual gear slipping if left unaddressed.
- Delayed forward or reverse engagement: A noticeable lag of 2-3 seconds after shifting indicates worn clutch pack clearances or a failing hydraulic valve body, reducing overall machine productivity.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.036.206 |
| Series | WG 201 (6 WG 201) |
| Overall Length (mm) | 785 |
| Overall Width (mm) | 510 |
| Overall Height (mm) | 620 |
| Dry Weight (kg) | 245 |
| Housing Material | High-grade cast iron (GGG-40) |
| Clutch Disc Material | Sintered bronze on steel |
| Torque Converter Diameter (mm) | 340 |
| OEM Reference | ZF Friedrichshafen AG |
Compatibility
This complete unit is engineered specifically for the WG 201 transmission family. It is a direct replacement for the 6-speed variant found in the following ZF models:
- ZF WG 180 (6 WG 180) – Early generation models with similar bell housing patterns.
- ZF WG 200 (6 WG 200) – Direct mechanical fit, identical mounting points.
- ZF WG 201 (6 WG 201) – Primary application, factory specification.
- ZF WG 210 (6 WG 210) – Compatible with adapter plate modifications for certain OEM installations.
This assembly is commonly installed in Volvo L90/L110 wheel loaders, Case 921E graders, and John Deere 744K loaders. Always verify the transmission serial number against the 4644.036.206 suffix before ordering to ensure correct spline count and hydraulic port configuration.
