Overview
The ZF 4644.036.067 6 WG 201 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control components into a single, ready-to-install package. As the core of the WG 201 series, it governs torque distribution and speed range selection under load. The SKU 4644.036.067 is a direct OEM replacement, ensuring precise fitment within the transmission housing. When paired with a robust TRANSMISSION HOUSING, this assembly maintains structural integrity under extreme stress. For applications requiring a different housing configuration, the TRANSMISSION HOUSING variant offers an alternative mounting solution.
Symptoms of Failure
- Delayed or harsh engagement: Worn clutch discs or hydraulic seals inside the assembly cause hesitation when shifting from neutral to forward or reverse.
- Oil leaks at the housing interface: Degraded gaskets or a cracked THREADED BUSH can allow transmission fluid to escape, leading to low pressure and overheating.
- Gear slipping under load: Internal wear on the planetary gear set or valve body results in a loss of torque transfer, especially during incline operation.
- Unusual whining or grinding noises: Bearing failure within the assembly produces metallic sounds that worsen with RPM changes.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.036.067 |
| Series | WG 201 (6-speed powershift) |
| Dry Weight | Approx. 185 kg (408 lbs) |
| Housing Material | High-strength cast iron |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| OEM Reference | ZF 6 WG 201 |
| Sealing Kit Includes | O-RING and SCREW PLUG |
Compatibility
This complete unit is engineered for the ZF WG 201 series, but it also serves as a direct replacement for earlier WG 180 and WG 200 variants when used with the correct housing. The assembly is compatible with models requiring a 6-speed powershift configuration, including those found in agricultural tractors, wheel loaders, and telescopic handlers. For proper identification, verify the TYPE PLATE on your existing unit. The assembly integrates with the COVER PLATE and is secured using HEXAGON SCREW fasteners. Internal adjustments require a SET SCREW for precise clutch pack clearance, while the BREATHER must be installed to prevent pressure buildup.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Encloses and supports the gear assembly |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing for specific applications |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for sensors |
| 4475280043 | SCREW PLUG | Seals hydraulic passages |
| 0634306198 | O-RING | Prevents fluid leaks at joints |
| 0730365067 | TYPE PLATE | Identifies transmission model and specs |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Fastens housing and cover plates |
| 0631610020 | SET SCREW | Adjusts clutch pack preload |
| 0501218540 | BREATHER | Equalizes internal air pressure |
