Overview
The ZF 4644.033.210 3 WG 201 Powershift Transmission Assembly | Complete Unit is a fully integrated drop-in replacement for heavy-duty off-highway vehicles. This complete assembly serves as the central power transfer module within the WG 201 series, managing clutch engagement and gear selection under high torque loads. The SKU 4644.033.210 denotes a factory-matched unit that includes the main casing, internal shafts, and hydraulic valve body. It sits directly between the engine bell housing and the output driveline, ensuring seamless power distribution during forward and reverse operations.
Symptoms of Failure
- Delayed or harsh gear engagement – When the internal clutch packs or hydraulic circuits degrade, operators experience a noticeable lag or jarring shift, especially when transitioning from neutral to drive.
- Internal oil leaks around the housing – Cracks or seal failures in the main casing allow transmission fluid to escape, often pooling under the vehicle and causing low-pressure warnings.
- Intermittent gear slipping under load – Worn friction discs or damaged pistons cause the transmission to lose torque during uphill climbs or heavy pulling, resulting in RPM flare without corresponding speed increase.
- Unusual whining or grinding noises – Bearing wear or debris contamination inside the assembly produces metallic sounds that intensify with engine speed, indicating imminent internal failure.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.033.210 |
| Assembly Type | Complete Powershift Unit (3 WG 201) |
| Estimated Weight | 185 kg (408 lbs) |
| Overall Dimensions (L x W x H) | 720 mm x 480 mm x 420 mm |
| Primary Material | Cast Iron Housing with Steel Internals |
| OEM Reference | ZF 3 WG 201 |
| Fluid Capacity (Approx.) | 12.5 liters |
| Max Input Torque | 1,200 Nm |
Compatibility
This complete unit is engineered for the ZF WG 201 series, which includes the WG180, WG200, and WG210 variants commonly found in telescopic handlers, wheel loaders, and forklifts. It also retrofits into earlier WG 180 models with minor hydraulic line adjustments. For proper sealing and alignment, always pair this assembly with a compatible TRANSMISSION HOUSING (4644101160) or the alternative TRANSMISSION HOUSING (4644301323). During installation, ensure the THREADED BUSH (4644301189) is torqued correctly to prevent fluid bypass, and secure the drain point with a SCREW PLUG (4475280043) to avoid leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4644301323 | TRANSMISSION HOUSING | Alternate housing variant for WG 201 series |
| 4644301189 | THREADED BUSH | Provides threaded mounting point for hydraulic lines |
| 4475280043 | SCREW PLUG | Seals fluid passages and drain ports |
| 0634306198 | O-RING | Prevents fluid leaks between mating surfaces |
| 0730365067 | TYPE PLATE | Identification plate with serial and model info |
| 4644301161 | COVER PLATE | Encloses valve body access area |
| 0636100621 | HEXAGON SCREW | Fastens housing sections together |
| 0631610020 | SET SCREW | Locks adjustment points on shift mechanism |
| 0501218540 | BREATHER | Equalizes internal pressure and vents moisture |
