Overview
The ZF 4644.024.007 4 WG 200(555) Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway applications. This assembly integrates the full clutch pack, planetary gear set, and hydraulic control system into a single, ready-to-install package. Designed for ZF’s WG 200 series, the SKU 4644.024.007 replaces the entire transmission core, eliminating the need for piecemeal repairs. It sits as the central driveline component, transferring engine torque through multiple speed ranges under demanding loads. For maximum structural integrity, this assembly mates directly with the 4644101245: TRANSMISSION HOUSING and the 4644301396: TRANSMISSION HOUSING, ensuring precise alignment and oil containment.
Symptoms of Failure
- Erratic gear engagement or slipping under load: When the 4644.024.007 assembly wears, internal clutch discs lose friction, causing the transmission to hesitate or slip during acceleration, especially on inclines.
- Hydraulic oil leaks from the main casing: Deteriorated seals within the unit allow pressurized ATF to escape, often pooling near the bell housing or output flange—a clear sign the assembly needs replacement.
- Delayed or harsh shifting between ranges: Worn valve body components or degraded planetary bearings produce a noticeable lag or clunk when shifting from forward to reverse or between low and high gears.
- Overheating and burnt fluid odor: Internal friction from failing clutches generates excessive heat, leading to dark, burnt-smelling transmission fluid and potential thermal damage to the 0730365125: TYPE PLATE identification tag.
Technical Specifications
| Specification | Value |
|---|---|
| Product SKU | 4644.024.007 |
| Assembly Type | Complete Powershift Transmission (4 WG 200(555)) |
| Dry Weight (approx.) | 185 kg (408 lbs) |
| Overall Length | 720 mm |
| Overall Width | 480 mm |
| Overall Height | 510 mm |
| Housing Material | High-grade cast iron (GGG-40) |
| OEM Reference | ZF 4 WG 200(555) |
| Torque Capacity | 550 Nm (405 lb-ft) max input |
| Fluid Capacity | 12.5 liters (ATF Dexron III) |
Compatibility
This 4644.024.007 assembly is specifically engineered for the ZF WG 200 series, including the 4 WG 200(555) variant. It is also backward-compatible with earlier WG 180 models when used with the correct adapter kit. The unit directly replaces the 4 WG 200(555) in telehandlers, wheel loaders, and agricultural tractors. For secure mounting, use the 0631311009: GROOVED STUD to fasten the assembly to the engine flywheel housing. Additional compatible models include the WG 210 and WG 220 series, though minor hydraulic line modifications may be required.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101245 | TRANSMISSION HOUSING | Encloses and supports the gear train |
| 4644301396 | TRANSMISSION HOUSING | Secondary housing for clutch pack |
| 0730365125 | TYPE PLATE | Identification and serial number tag |
| 0631311009 | GROOVED STUD | Fastener for engine-to-transmission connection |
| 0636015073 | HEXAGON SCREW | Secures housing bolts |
| 4644301116 | SCREEN SHEET | Oil filter mesh for hydraulic circuit |
| 4644301088 | SEALING CAP | Prevents fluid leaks from ports |
| 4642106044 | SHIFT SYSTEM | Controls gear selection hydraulically |
| 4642306276 | VALVE BLOCK | Manages oil flow to clutches |
| 4642306324 | GASKET | Seals housing mating surfaces |
