Overview
The ZF 4644.004.224 WENDEGETRIEBE Powershift Transmission Assembly is a complete, ready-to-install unit engineered for the demanding WG 180 Series. This assembly integrates the reversing gear mechanism and clutch pack housing, serving as the central power distribution hub within the transmission. Designed for heavy-duty industrial vehicles, it ensures seamless directional changes under load without clutching. The SKU 4644.004.224 is a direct OEM replacement, eliminating the need for partial rebuilds. When installing this unit, always pair it with a new 4644105413 DISCONNECTION to secure the driveline interface, and verify the condition of the 4644101222 TRANSMISSION HOUSING for cracks or wear.
Symptoms of Failure
When the ZF 4644.004.224 assembly begins to degrade, operators typically notice these specific failure modes:
- Delayed or harsh directional shifts: The unit struggles to engage forward or reverse, causing a noticeable lag or clunking noise during gear changes.
- Internal oil leaks near the bell housing: Worn seals within the WENDEGETRIEBE allow transmission fluid to escape, often pooling under the vehicle after extended operation.
- Loss of power under load: The clutch packs slip during high-torque applications, leading to reduced tractive effort and overheating of the transmission fluid.
- Unusual whining or grinding noises: Damaged planetary gears or bearings inside the assembly produce metallic sounds, especially when reversing.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.004.224 |
| Assembly Type | WENDEGETRIEBE Powershift (Complete Unit) |
| Weight (approx.) | 85 kg (187 lbs) |
| Housing Material | Cast Iron (GGG-40) |
| Input Spline Count | 24-tooth, 2.5 module |
| Max Torque Capacity | 1,800 Nm |
| OEM Reference | ZF 4644.004.224 |
| Seal Type | Viton (high-temperature) |
Compatibility
This assembly is specifically engineered for the ZF WG 180 Series transmissions. It is also compatible with the WG 200 and WG 150 series when used with the correct adapter kit. The unit directly replaces part numbers 4644.004.221 and 4644.004.223. For proper installation, ensure the 4642303093 OUTPUT FLANGE is torqued to factory specifications, and use a new 0636021010 HEXAGON SCREW for the housing bolts to prevent loosening.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105413 | DISCONNECTION | Disconnects driveline for service |
| 4642303093 | OUTPUT FLANGE | Transfers torque to driveshaft |
| 0636021010 | HEXAGON SCREW | Secures housing assembly |
| 4644101222 | TRANSMISSION HOUSING | Main structural casing |
| 4644301226 | TRANSMISSION HOUSING | Alternate housing variant |
| 0730365067 | TYPE PLATE | Identification and rating label |
| 0631311009 | GROOVED STUD | Alignment dowel for assembly |
| 4644301298 | COVER PLATE | Protects internal components |
| 0634306525 | O-RING | Seals fluid passages |
| 0636305026 | SCREW PLUG | Closes inspection ports |
