Overview
The ZF 4644.036.065 6 WG 201 Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway applications. This assembly integrates the main drive housing, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core of the WG 201 series, it manages torque distribution across six forward speeds, ensuring smooth power delivery under extreme loads. The SKU 4644.036.065 designates a fully assembled unit, making it a direct replacement for worn-out transmissions in loaders, graders, and material handlers. When installing this unit, always verify the integrity of the TRANSMISSION HOUSING (part 4644101160) and the TRANSMISSION HOUSING (part 4644301323) to ensure proper alignment and sealing.
Symptoms of Failure
When the ZF 4644.036.065 assembly begins to fail, operators typically notice these specific symptoms:
- Erratic gear engagement or slipping under load – Worn clutch discs or piston seals inside the unit cause delayed shifts, especially when transitioning from forward to reverse.
- External oil leaks at the housing seam – Cracks or gasket failure in the main casing lead to fluid loss, often visible as drips near the bell housing or PTO cover.
- Unusual whining or grinding noises – Damaged bearings or planetary gear sets produce metallic sounds during acceleration or deceleration.
- Overheating transmission fluid – Internal wear increases friction, causing the oil to exceed normal operating temperatures and degrade faster.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.036.065 |
| Series | WG 201 (6-speed powershift) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 6 WG 201 |
| Fluid Capacity | 12.5 liters (SAE 10W-30) |
Compatibility
This complete unit is specifically designed for the ZF WG 201 transmission series. It is also compatible with earlier WG 180 and WG 200 models when used with the correct adapter kit. The assembly fits directly into vehicles such as the Liebherr L-556, Volvo L70F, and Caterpillar 950H, provided the existing THREADED BUSH (part 4644301189) and SCREW PLUG (part 4475280043) are replaced during installation. Always cross-reference your vehicle’s transmission tag to confirm fitment before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Secondary housing for clutch pack |
| 4644301189 | THREADED BUSH | Guides shift fork movement |
| 4475280043 | SCREW PLUG | Seals oil passages |
| 0634306198 | O-RING | Prevents fluid leaks at joints |
| 0730365067 | TYPE PLATE | Identification tag for serial number |
| 4644301161 | COVER PLATE | Protects valve body access |
| 0636100621 | HEXAGON SCREW | Fastens housing sections |
| 0631610020 | SET SCREW | Locks adjustment points |
| 0501218540 | BREATHER | Equalizes internal pressure |
