Overview
The ZF 4644.026.330 6 WG 200(555/5) Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway applications. This assembly integrates the main gear cluster, clutch packs, and hydraulic control system into a single ready-to-install package. As the core power delivery module in the WG 200 Series, it manages torque distribution across six forward and three reverse speeds. The SKU 4644.026.330 is a direct OEM replacement, ensuring seamless fitment without the need for core assembly. When installing this unit, technicians should verify the condition of the 4644101176: TRANSMISSION HOUSING and 4644301371: TRANSMISSION HOUSING to confirm structural integrity before final assembly.
Symptoms of Failure
When the ZF 4644.026.330 assembly begins to degrade, operators will notice distinct performance issues. Delayed engagement or gear slipping under load is the most common complaint, often accompanied by a noticeable loss of tractive effort on inclines. Internal hydraulic pressure loss leads to erratic shifting and clutch chatter during directional changes. Contaminated transmission fluid with metallic debris signals advanced wear of the clutch discs or planetary gears. Finally, audible whining or grinding noises from the bell housing area indicate bearing failure within the assembly, requiring immediate replacement to avoid catastrophic damage to the 0730365067: TYPE PLATE and related identification components.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4644.026.330 |
| Assembly Type | 6 WG 200 (555/5) Powershift |
| Dry Weight | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Input Torque Capacity | 555 Nm (max) |
| Housing Material | High-strength cast iron |
| Clutch Pack Count | 6 (forward) + 3 (reverse) |
| Mounting Hardware | Includes 0631311009: GROOVED STUD set |
Compatibility
This complete assembly is engineered for the ZF WG 200 Series transmission family, including models WG180, WG200, and WG210. It directly replaces units with the 555/5 gear ratio configuration. The assembly is compatible with both 4×4 and 6×6 driveline layouts found in agricultural tractors, wheel loaders, and industrial forklifts. For proper sealing, always pair this unit with a new 0634306525: O-RING at the input flange. The 0636610028: STUD kit is recommended for securing the assembly to the engine flywheel housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101176 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301371 | TRANSMISSION HOUSING | Rear housing section for output shaft |
| 0730365067 | TYPE PLATE | Identification plate with serial number |
| 0631311009 | GROOVED STUD | Alignment and retention stud for housing |
| 4644303060 | COVER PLATE | Access cover for clutch pack inspection |
| 4644201011 | COVER PLATE | Lower sump cover with gasket surface |
| 4644201010 | COVER PLATE | Side cover for valve body access |
| 4644301372 | COVER PLATE | Rear output flange cover |
| 0636610028 | STUD | Threaded stud for cover plate mounting |
| 0634306525 | O-RING | Hydraulic seal for input shaft bore |
