Overview
The ZF 4644.026.307 WENDEGETRIEBE Powershift Transmission Assembly is a complete, factory-matched unit designed for the WG 200 Series. This assembly serves as the core directional and speed-shifting module, integrating the forward/reverse clutch pack and planetary gear set. The SKU 4644.026.307 is a direct replacement for worn or failed assemblies, restoring full power flow in heavy-duty industrial vehicles. It sits between the torque converter and the main output housing, managing load distribution during shuttle operations. For structural integrity, this unit mounts directly to the 4644101144: TRANSMISSION HOUSING and is sealed by the 4644301304: HOUSING component.
Symptoms of Failure
- Erratic shuttle shifting or gear slipping – When the WENDEGETRIEBE assembly wears, operators experience delayed engagement or complete loss of forward/reverse direction under load.
- Internal hydraulic pressure loss – Worn seals within the assembly cause low clutch pressure, leading to overheating and burnt transmission fluid odor.
- Metallic grinding noise during direction change – Damaged planetary gears or bearing failure produce audible grinding, especially when shifting from forward to reverse.
- Oil leaks at the housing interface – Cracks or gasket failure in the assembly allow ATF to seep past the 0730365067: TYPE PLATE mounting area, leaving visible drips under the vehicle.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.026.307 |
| Assembly Type | WENDEGETRIEBE Powershift (Complete Unit) |
| Weight | 48 kg (106 lbs) |
| Material | Cast Iron Housing with Hardened Steel Gears |
| Dimensions (L x W x H) | 420 mm x 320 mm x 280 mm |
| OEM Reference | ZF WG200 Series |
| Bolt Torque Spec | 120 Nm (88 lb-ft) for housing bolts |
Compatibility
This complete unit is engineered for the ZF WG 200 Series, specifically the WG180, WG200, and WG210 models used in telehandlers, forklifts, and wheel loaders. It also fits select ZF 4WG-200 variants. The assembly requires the 0631311009: GROOVED STUD for proper alignment during installation. For shift control, pair it with the 4644106300: SHIFT SYSTEM and 4644159300: SHIFT SYSTEM components. The 4644306500: COVER PLATE and 4644306560: VALVE BLOCK are also required for hydraulic circuit completion. Do not reuse old 4644306408: WASHER seals during reassembly. The 4644107006: SPEEDOMETER drive gear must be inspected for wear when replacing this unit.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101144 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301304 | HOUSING | Secondary housing for clutch pack |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment dowel for assembly |
| 4644106300 | SHIFT SYSTEM | Hydraulic shift actuator |
| 4644306500 | COVER PLATE | Sealing cover for valve body |
| 4644159300 | SHIFT SYSTEM | Secondary shift control module |
| 4644306560 | VALVE BLOCK | Hydraulic pressure distribution |
| 4644306408 | WASHER | Sealing washer for oil passages |
| 4644107006 | SPEEDOMETER | Output speed sensor drive |
