Overview
The ZF 4644.026.196 6 WG 200(555/5) Powershift Transmission Assembly | Complete Unit is a fully assembled, drop-in ready gearbox core designed for heavy-duty off-highway machinery. This complete unit integrates the main gear train, clutch packs, and hydraulic control system into a single, pre-tested assembly. As a direct OEM replacement, the SKU 4644.026.196 sits at the heart of the driveline, converting engine torque into precisely modulated wheel speed for loaders, graders, and industrial tractors. When installing this assembly, ensure the 4644101175: TRANSMISSION HOUSING is inspected for cracks, and the 0730365067: TYPE PLATE is correctly affixed to verify model identification.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn clutch discs or degraded seals inside the assembly cause the transmission to hesitate or lose torque when shifting from forward to reverse.
- Internal hydraulic pressure loss: A failing pump or valve body within the unit leads to slow or incomplete shifts, often accompanied by a whining noise from the sump.
- Visible oil leaks at the bell housing or output flange: Deteriorated gaskets or cracked casings allow ATF to weep, leaving puddles under the machine and risking low fluid levels.
- Metal debris in the oil filter or magnet: Advanced wear of bearings or gear teeth produces metallic particles, indicating imminent catastrophic failure if not addressed.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.026.196 |
| Assembly Type | Complete Powershift Unit (6 WG 200) |
| Gear Ratio Range | 555/5 (Forward/Reverse) |
| Dry Weight | ~185 kg (408 lbs) |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 6 WG 200 Series |
| Input Torque Capacity | Up to 2000 Nm |
Compatibility
This complete unit is engineered for the ZF WG 200 Series powershift family. It is directly compatible with models such as the WG180, WG200, and WG210 transmissions commonly found in Volvo, Case, and Caterpillar wheel loaders. The assembly also fits select ZF 6-speed powershift variants used in telehandlers and industrial forklifts. For a secure installation, pair this unit with the 4644301221: TRANSMISSION HOUSING and the 0631311009: GROOVED STUD for proper alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101175 | TRANSMISSION HOUSING | Outer casing that encloses the gear train and supports bearings. |
| 4644301221 | TRANSMISSION HOUSING | Alternate housing variant for specific WG200 sub-models. |
| 0730365067 | TYPE PLATE | Identification plate riveted to the housing for serial number tracking. |
| 0631311009 | GROOVED STUD | Alignment stud for precise housing-to-bell housing mounting. |
| 4644303060 | COVER PLATE | Seals the access port for valve body inspection. |
| 4644303061 | COVER PLATE | Alternate cover plate with different bolt pattern. |
| 0634306525 | O-RING | Hydraulic seal for cover plate and filter housing. |
| 0636305026 | SCREW PLUG | Magnetic drain plug for oil sump. |
| 0501316470 | BREATHER | Ventilation valve to equalize internal pressure. |
| 4644301279 | SCREEN SHEET | Fine mesh filter for hydraulic oil return line. |
