Overview
The ZF 4644.026.382 6 WG 200 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the main gear cluster, clutch packs, and hydraulic control elements into a single, ready-to-install package. As a core component of the WG 200 Series, it manages torque distribution across six forward speeds, ensuring smooth power delivery under extreme loads. The SKU 4644.026.382 replaces worn or failed assemblies, restoring original ZF performance. This unit sits directly between the engine flywheel housing and the final drive, acting as the primary power transfer interface.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the internal clutch packs or hydraulic seals degrade, the transmission fails to hold gear position, causing RPM flare without corresponding vehicle movement.
- External oil seepage from housing seams: Worn gaskets or cracked casings allow ATF to escape, often visible as drips near the bell housing or output flange.
- Delayed or harsh shifting between forward ranges: Accumulated wear in the valve body or piston seals produces a noticeable lag or jarring shift, especially when transitioning from 3rd to 4th gear.
- Metallic grinding or whining noise during operation: Bearing failure or gear tooth pitting generates distinct audible feedback, worsening as the assembly heats up.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4644.026.382 |
| Series | WG 200 (6 WG 200) |
| Type | Powershift Transmission Assembly (Complete Unit) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 620 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| Clutch Pack Material | Sintered bronze on steel |
| Max Input Torque | 1,200 Nm |
| OEM Reference | ZF 6 WG 200 |
Compatibility
This complete assembly is engineered for the ZF WG 200 Series, specifically the 6-speed variant (6 WG 200). It is also compatible with the WG 180 Series when used with the appropriate TRANSMISSION HOUSING (4644101249) or TRANSMISSION HOUSING (4644301402). The unit directly replaces assemblies in WG 200 models found in loaders, graders, and industrial tractors. For proper sealing, always pair this assembly with a new O-RING (0634306323) and inspect the COVER PLATE (4644301298) for warping during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301402 | TRANSMISSION HOUSING | Alternate housing variant for WG 200 |
| 4644301298 | COVER PLATE | Seals the top access port |
| 0634306323 | O-RING | Hydraulic seal between housing sections |
| 0636305026 | SCREW PLUG | Closes oil drain or fill ports |
| 4644301279 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4644301088 | SEALING CAP | Protects exposed hydraulic ports |
| 4475280079 | SCREW PLUG | High-pressure port plug |
| 4644121150 | OIL PIPE | Internal lubrication routing tube |
| 4644298502 | REPAIR KIT | Contains seals, gaskets, and O-rings |
