Overview
The ZF 4644.026.080 WENDEGETRIEBE Powershift Transmission Assembly is a complete, fully assembled unit engineered for demanding industrial drivetrains. This component integrates the reversing gearset and clutch pack into a single, ready-to-install module, serving as the core directional control element within the transmission. Designed for the WG 200 Series, this assembly manages torque flow during forward and reverse operations, ensuring seamless power delivery under heavy loads. The SKU 4644.026.080 is a direct replacement for worn or failed assemblies, restoring original shift quality and operational reliability.
Symptoms of Failure
When the ZF 4644.026.080 assembly begins to degrade, operators typically notice these specific failure indicators:
- Delayed or harsh directional engagement: A noticeable lag or clunk when shifting between forward and reverse, often accompanied by a momentary loss of power.
- Internal hydraulic leaks: Fluid seepage from the housing or clutch pack area, leading to low transmission pressure and erratic shifting behavior.
- Gear slipping under load: The transmission fails to hold torque during acceleration or incline operation, causing RPM flare without corresponding vehicle movement.
- Unusual grinding or whining noises: Metallic sounds from the gearset area, particularly during directional changes, indicating worn bearings or gear teeth.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.026.080 |
| Assembly Type | WENDEGETRIEBE (Reversing Gearset) Powershift Unit |
| Overall Length | 485 mm (19.1 in) |
| Housing Diameter | 320 mm (12.6 in) |
| Dry Weight | 42 kg (92.6 lbs) |
| Housing Material | High-Grade Cast Iron (GGG-40) |
| Clutch Plate Material | Sintered Bronze on Steel |
| OEM Reference | ZF 4644.026.080 (Direct OE) |
| Seal Kit Included | Yes (pre-installed) |
Compatibility
This complete unit is specifically designed for the ZF WG 200 Series powershift transmissions. Based on its construction and part numbering, the 4644.026.080 assembly is directly compatible with the following models:
- ZF WG 180 (late production variants with WG200-style internals)
- ZF WG 200 (all standard configurations)
- ZF WG 210 (with adapter plate verification)
- ZF WG 220 (heavy-duty off-highway applications)
Always cross-reference your transmission’s serial number with the SKU 4644.026.080 to confirm fitment. This assembly replaces earlier WENDEGETRIEBE units without requiring housing modifications.
