Overview
The ZF 4644.026.323 WENDEGETRIEBE Powershift Transmission Assembly is a complete, fully assembled unit engineered for heavy-duty industrial drivelines. This specific SKU, 4644.026.323, functions as the primary directional and speed control module within the WG 200 Series family. It integrates the forward/reverse clutch pack, hydraulic valve body, and planetary gear set into a single, sealed housing. Designed for applications requiring frequent direction changes under load—such as wheel loaders, forklifts, and terminal tractors—this assembly ensures smooth power modulation without clutching. As a complete unit, it eliminates the need for piecemeal rebuilds, providing a direct bolt-on replacement that restores OEM torque capacity and shift quality.
Symptoms of Failure
When the ZF 4644.026.323 WENDEGETRIEBE begins to degrade, operators will notice distinct operational deficits. Recognizing these powershift transmission failure symptoms early can prevent catastrophic driveline damage.
- Delayed or Harsh Directional Shifts: A pronounced lag when switching from forward to reverse, or a violent engagement, indicates internal clutch pack wear or hydraulic pressure loss within the assembly.
- Oil Leaks at the Bell Housing or Output Flange: External seepage around the main seals or the joint between the gearbox and the torque converter is a common sign of seal degradation or housing fatigue.
- Transmission Slipping Under Load: The engine revs increase without a proportional increase in wheel speed, particularly when the machine is under heavy load or climbing a grade. This points to worn friction discs or a failing piston seal.
- Unusual Whining or Grinding Noises: A high-pitched whine during deceleration or a metallic grinding sound during engagement suggests bearing failure or gear tooth damage inside the planetary set.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number / SKU | 4644.026.323 |
| Assembly Type | Complete WENDEGETRIEBE (Reversing Unit) |
| Series | WG 200 |
| Dry Weight (Approx.) | 78 kg (172 lbs) |
| Housing Material | High-Tensile Cast Iron (GGG-40) |
| Input Torque Capacity | Up to 650 Nm (479 lb-ft) |
| Overall Length | 385 mm |
| Flange Diameter | SAE 3 (Standard) |
| OEM Reference | ZF 4644.026.323 (Direct Replacement) |
Compatibility
This complete unit is specifically designed for the ZF WG 200 Series of powershift transmissions. It is a direct fit for models including the WG180, WG200, and WG210 variants. While primarily intended for the WG 200 family, it may also be compatible with certain early WG 150 series applications that utilize the same bell housing bolt pattern and input shaft spline count. Always verify the flange configuration and input shaft length against your existing unit. This assembly is commonly found in ZF 4WG-200 and ZF 6WG-200 transmission systems used in industrial material handling equipment.
Common Machine Applications
- Kramer Allrad wheel loaders
- Linde forklift trucks (H50-H80 series)
- Schäff skid steer loaders
- Weidemann compact loaders
