Overview
The ZF 4644.026.293 WENDEGETRIEBE Powershift Transmission Assembly is a complete, factory-matched unit designed for the demanding environment of industrial drivetrains. As a core component of the WG 200 Series, this assembly functions as the reversing gear group, enabling seamless directional changes without clutching. The SKU 4644.026.293 represents a fully assembled unit, integrating the planetary gear set, clutch packs, and hydraulic control elements into a single, ready-to-install package. This assembly sits directly between the torque converter and the main output shaft, managing power flow for forward and reverse operations in wheel loaders, forklifts, and heavy-duty mobile equipment.
Symptoms of Failure
When the ZF 4644.026.293 begins to degrade, operators often notice specific performance issues. Look for these warning signs:
- Delayed or harsh directional shifts: A noticeable lag or jolt when switching between forward and reverse indicates worn clutch discs or hydraulic seal degradation within the assembly.
- Oil leaks near the bell housing: External seepage around the mating surfaces often points to a compromised TRANSMISSION HOUSING or damaged gaskets, leading to low fluid levels.
- Gear slipping under load: The transmission may momentarily lose power during acceleration or when climbing, suggesting internal wear in the powershift clutches.
- Unusual whining or grinding noises: Metallic sounds from the transmission center section often signal bearing failure or debris contamination within the unit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4644.026.293 |
| Assembly Type | WENDEGETRIEBE (Reversing Gear) Powershift Unit |
| Series | WG 200 |
| Estimated Weight | 85 kg (187 lbs) |
| Housing Material | High-Grade Cast Iron |
| OEM Reference | ZF Friedrichshafen AG |
| Input Torque Capacity | Up to 600 Nm (estimated) |
| Wet Weight (with oil) | 92 kg (203 lbs) |
Compatibility
This complete unit is engineered for the ZF WG 200 Series of powershift transmissions. It is directly compatible with models including the WG180, WG200, and WG211, commonly found in telehandlers, compact loaders, and industrial tractors. The assembly also fits select variants of the WG150 series when paired with the correct TRANSMISSION HOUSING. Always verify the serial number on your existing TYPE PLATE to ensure a match. The unit mounts using specific GROOVED STUD fasteners, which should be inspected during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101216 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301223 | TRANSMISSION HOUSING | Alternative housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Mounting fastener for assembly |
| 4644303060 | COVER PLATE | Seals the clutch access port |
| 4644303061 | COVER PLATE | Alternate cover plate for oil passages |
| 0634306525 | O-RING | Hydraulic seal for pressure lines |
| 0636305026 | SCREW PLUG | Drain or fill port closure |
| 4644301279 | SCREEN SHEET | Filter mesh for oil intake |
| 4644301088 | SEALING CAP | Protects hydraulic ports during storage |
