Overview
The ZF 4644.033.205 3 WG 201 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the clutch packs, planetary gear sets, and hydraulic control components into a single, ready-to-install package. As the core power transfer module in the WG 201 series, it converts engine torque into precise, multi-speed output for loaders, graders, and industrial vehicles. The SKU 4644.033.205 ensures you receive a fully assembled unit that matches OEM specifications, eliminating the need for piecemeal component sourcing.
Symptoms of Failure
- Delayed or harsh engagement: When the assembly wears, hydraulic pressure drops, causing a noticeable lag between shifting and gear engagement, often accompanied by a jarring clunk.
- Transmission slipping under load: Worn clutch discs or seals inside the 4644.033.205 lead to power loss during acceleration or uphill operation, with the engine revving higher than expected.
- External oil leaks at housing joints: Degraded gaskets or cracks in the assembly allow ATF to seep out, leaving puddles under the vehicle and reducing fluid levels.
- Unusual whining or grinding noises: Bearing fatigue or gear tooth damage within the unit produces a high-pitched whine or metallic grinding sound, especially in lower gears.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Complete Powershift Transmission Assembly |
| SKU / Part Number | 4644.033.205 |
| Series | WG 201 |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron |
| OEM Reference | ZF 3 WG 201 |
| Fluid Capacity | 12.5 liters (approx.) |
Compatibility
This assembly is engineered for the ZF WG 201 series transmissions. It is directly compatible with models including the WG180, WG200, and WG201 variants found in articulated dump trucks, wheel loaders, and telescopic handlers. The 4644.033.205 unit also fits select retrofit applications in older WG160 chassis where a complete upgrade is desired. Always verify bell housing and output flange configurations before installation.
When replacing this assembly, several companion components must be inspected and often renewed. The TRANSMISSION HOUSING (4644101160) and the TRANSMISSION HOUSING (4644301323) provide the structural envelope for the unit. A worn THREADED BUSH (4644301189) can cause alignment issues, while a missing or damaged SCREW PLUG (4475280043) will lead to fluid loss. These parts should be replaced concurrently to ensure a leak-free, long-lasting installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear and clutch assembly |
| 4644301323 | TRANSMISSION HOUSING | Alternative housing variant for specific WG models |
| 4644301189 | THREADED BUSH | Provides wear-resistant thread for mounting bolts |
| 4475280043 | SCREW PLUG | Seals hydraulic ports to prevent fluid leaks |
| 0634306198 | O-RING | Creates a fluid-tight seal between mating surfaces |
| 0730365067 | TYPE PLATE | Identification plate with serial and model numbers |
| 4644301161 | COVER PLATE | Protects internal components from debris ingress |
| 0636100621 | HEXAGON SCREW | Fastens housing sections together securely |
| 0631610020 | SET SCREW | Adjusts and locks shift linkage positions |
| 0501218540 | BREATHER | Equalizes internal pressure and vents moisture |
