Overview
The ZF 4644.026.287 6 WG 200(555/5) Powershift Transmission Assembly | Complete Unit is a fully assembled, ready-to-install gearbox core designed for heavy-duty industrial and agricultural machinery. This complete unit integrates the main housing, clutch packs, planetary gears, and hydraulic control system into a single, pre-tested assembly. As a direct replacement for the original equipment, the SKU 4644.026.287 ensures seamless integration with the WG 200 series driveline, providing reliable torque distribution and smooth shifting under extreme loads. The assembly sits as the central power transfer module, connecting the engine output to the final drive.
Symptoms of Failure
When the ZF 4644.026.287 assembly begins to fail, operators typically notice these specific issues:
- Delayed or harsh gear engagement: The transmission hesitates before engaging forward or reverse, often accompanied by a loud clunk, indicating internal clutch pack wear or hydraulic pressure loss.
- Oil leaks at the housing seam: Visible fluid seepage around the main casing joints, often caused by a degraded 0634306525: O-RING or a cracked 4644101177: TRANSMISSION HOUSING.
- Gear slipping under load: The transmission momentarily loses power during uphill climbs or heavy pulling, a classic sign of worn clutch discs or a failing torque converter within the assembly.
- Overheating and burnt fluid smell: Continuous high-temperature operation, often due to a blocked 4644301279: SCREEN SHEET or a faulty 0501316470: BREATHER causing pressure buildup.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (SKU) | 4644.026.287 |
| Assembly Type | Complete Powershift Transmission Unit |
| Series | WG 200 (6 WG 200) |
| Gear Ratio | 555/5 (Forward/Reverse) |
| Estimated Weight | 385 kg (849 lbs) |
| Housing Material | High-Grade Cast Iron |
| OEM Reference | ZF 4644.026.287 |
| Input Torque Capacity | Up to 2,100 Nm |
Compatibility
This complete unit is engineered for the ZF WG 200 series, specifically the 6-speed variant. It is directly compatible with the following ZF transmission models:
- ZF WG 180 (with adapter modifications)
- ZF WG 200 (primary fit)
- ZF WG 210 (limited compatibility)
- ZF 6 WG 200 (direct fit)
For proper installation, ensure the 4644301229: TRANSMISSION HOUSING is correctly aligned, and secure the assembly using the 0631311009: GROOVED STUD for mounting. Always verify the 0730365067: TYPE PLATE matches your unit’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101177 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4644301229 | TRANSMISSION HOUSING | Secondary housing for clutch pack enclosure |
| 0730365067 | TYPE PLATE | Identification plate with serial and model data |
| 0631311009 | GROOVED STUD | Threaded fastener for housing alignment |
| 4644303060 | COVER PLATE | Seals the access port for valve body inspection |
| 4644303061 | COVER PLATE | Alternate cover plate for filter access |
| 0634306525 | O-RING | Hydraulic seal between housing sections |
| 0636305026 | SCREW PLUG | Drain or fill port closure |
| 0501316470 | BREATHER | Ventilation valve to equalize internal pressure |
| 4644301279 | SCREEN SHEET | Filter mesh for hydraulic fluid debris |
