Overview
The ZF 4644.033.028 3 WG 201 Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready gearbox designed for heavy-duty off-highway applications. This complete unit integrates the main drive train, clutch packs, and hydraulic control system within a robust casing. As a core component of the WG 201 series, it manages torque distribution and gear selection under high load conditions. The SKU 4644.033.028 identifies this specific assembly, which is often paired with the 4644101160: TRANSMISSION HOUSING and the 4644301323: TRANSMISSION HOUSING to form a sealed, durable unit.
Symptoms of Failure
When the ZF 4644.033.028 assembly begins to fail, operators typically notice these specific issues:
- Delayed or harsh gear engagement – Worn clutch discs or valve body issues cause hesitation when shifting from neutral to forward or reverse.
- Oil leaks at the housing interface – Degraded seals around the 4644301189: THREADED BUSH or the 4475280043: SCREW PLUG allow transmission fluid to escape, leading to low pressure.
- Gear slipping under load – Internal wear in the planetary gear sets or hydraulic circuit causes the transmission to lose torque during operation.
- Unusual whining or grinding noises – Bearing failure or contamination within the assembly produces audible distress signals.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.033.028 |
| Assembly Type | Complete Powershift Unit (3 WG 201) |
| Estimated Weight | 185 kg (408 lbs) |
| Housing Material | High-Grade Cast Iron |
| OEM Reference | ZF 3 WG 201 |
| Sealing Components | 0634306198: O-RING, 0636100621: HEXAGON SCREW |
| Identification | 0730365067: TYPE PLATE |
| Cover & Ventilation | 4644301161: COVER PLATE, 0501218540: BREATHER |
| Fasteners | 0631610020: SET SCREW |
Compatibility
This complete assembly is engineered for the ZF WG 201 series powershift transmissions. It is directly compatible with models including the WG180, WG200, and WG210. The unit is commonly found in construction machinery such as wheel loaders, graders, and telehandlers. For proper installation, ensure the 4644101160: TRANSMISSION HOUSING and 4644301323: TRANSMISSION HOUSING are inspected for cracks or wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Encloses and supports internal gear sets |
| 4644301323 | TRANSMISSION HOUSING | Secondary housing for clutch pack assembly |
| 4644301189 | THREADED BUSH | Provides threaded interface for hydraulic lines |
| 4475280043 | SCREW PLUG | Seals oil passages and prevents leakage |
| 0634306198 | O-RING | Creates a fluid-tight seal between components |
| 0730365067 | TYPE PLATE | Displays serial number and model identification |
| 4644301161 | COVER PLATE | Protects internal components from debris |
| 0636100621 | HEXAGON SCREW | Secures housing and cover plate assemblies |
| 0631610020 | SET SCREW | Locks adjustment mechanisms in place |
| 0501218540 | BREATHER | Equalizes internal pressure and vents moisture |
