Overview
The ZF 4644.036.047 6 WG 201 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in replacement for heavy-duty off-highway vehicles and industrial machinery. This complete unit integrates the gear cluster, clutch packs, and hydraulic control system into a single, pre-tested assembly. As a core component of the WG 201 Series, it manages torque distribution across six forward speeds and one reverse, enabling smooth, clutchless shifting under load. The SKU 4644.036.047 identifies this specific build configuration, which is critical for matching OEM specifications in ZF powershift drivelines.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, hydraulic pressure drops, causing a noticeable lag or jarring shift between forward and reverse gears.
- Oil leaks at housing seams: Degraded seals allow transmission fluid to weep from the joint between the main case and the TRANSMISSION HOUSING (part 4644101160) or the TRANSMISSION HOUSING (part 4644301323).
- Gear slipping under load: Worn clutch discs within the assembly fail to hold torque, causing the engine to rev without proportional vehicle movement, especially on inclines.
- Unusual whining or grinding noises: Bearing fatigue inside the unit produces a high-pitched whine that escalates to a grinding sound as debris contaminates the hydraulic circuit.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.036.047 |
| Series | WG 201 |
| Assembly Type | Complete Powershift Unit (6 WG 201) |
| 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 4644.036.047 |
| Sealing Kit Includes | O-RING (0634306198) |
| Identification | TYPE PLATE (0730365067) |
| Cover Component | COVER PLATE (4644301161) |
| Fastener (Housing) | HEXAGON SCREW (0636100621) |
| Fastener (Internal) | SET SCREW (0631610020) |
| Ventilation | BREATHER (0501218540) |
Compatibility
This complete unit is engineered for the ZF WG 201 Series powershift transmissions. It is a direct fit for models including the WG180, WG200, and WG211, which are commonly used in telescopic handlers, wheel loaders, and rough-terrain forklifts. The assembly also interfaces with earlier WG160 variants when paired with the correct THREADED BUSH (4644301189) and SCREW PLUG (4475280043) for hydraulic port sealing. Always verify your transmission serial number against the 4644.036.047 configuration to ensure hydraulic pressure ratings match your application.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural case for gear support |
| 4644301323 | TRANSMISSION HOUSING | Secondary housing for clutch pack enclosure |
| 4644301189 | THREADED BUSH | Wear-resistant insert for hydraulic line ports |
| 4475280043 | SCREW PLUG | Seals unused hydraulic test ports |
| 0634306198 | O-RING | Prevents fluid leaks at housing joints |
| 0730365067 | TYPE PLATE | Provides serial number and model identification |
| 4644301161 | COVER PLATE | Encloses the valve body access area |
| 0636100621 | HEXAGON SCREW | Secures housing halves together |
| 0631610020 | SET SCREW | Locks shift fork positions internally |
| 0501218540 | BREATHER | Equalizes internal pressure and vents moisture |
