Overview
This genuine ZF 4644.035.201 5 WG 201 Powershift Transmission Assembly is a complete, factory-spec unit designed for heavy-duty off-highway applications. As the core hydraulic-mechanical assembly in the WG 201 series, it integrates the torque converter, planetary gear sets, and clutch packs into a single sealed housing. The SKU 4644.035.201 serves as the direct replacement for worn-out transmissions in wheel loaders, dozers, and material handlers, restoring full power flow from the engine to the driveline. This complete unit eliminates the need for partial rebuilds, offering a drop-in solution that maintains OEM shift quality and load-holding capacity.
Symptoms of Failure
When the ZF 4644.035.201 assembly begins to degrade, operators typically notice these specific failure modes:
- Delayed engagement or gear slipping under load: Worn clutch packs or valve body wear cause the transmission to hesitate before engaging forward or reverse, especially when the machine is under heavy load.
- External oil leaks at the main housing gasket or converter seal: Thermal cycling and vibration cause the sealing surfaces to separate, leading to visible drips of ATF around the bell housing and output flange.
- Erratic shifting or harsh direction changes: Contaminated hydraulic fluid or worn spools in the control valve section produce jerky, unpredictable shifts that reduce operator comfort and component life.
- Overheating and loss of power to the wheels: Internal wear in the torque converter stator or planetary gears generates excessive heat, triggering the thermal bypass and reducing tractive effort.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4644.035.201 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 201 (5-speed) |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 710 mm |
| Overall Width | 520 mm |
| Overall Height | 580 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 4644.035.201 / 5 WG 201 |
| Fluid Capacity | 28 liters (ZF TE-ML 03 spec) |
Compatibility
This complete unit is engineered for the ZF WG 201 series, but its mounting pattern and input spline also allow direct fitment into several related ZF transmission families. Verified compatible models include:
- ZF WG 180: Shares the same bell housing bolt pattern and output flange dimensions for most wheel loader applications.
- ZF WG 200: Direct mechanical interchange; the 4644.035.201 replaces earlier WG 200 units with updated clutch material.
- ZF 5 WG 201: The exact series for which this assembly was originally manufactured.
- ZF 4 WG 210 (select variants): Fits when the torque converter housing is swapped; verify input shaft length before installation.
Always cross-reference your existing transmission’s serial number with the ZF parts catalog to confirm fitment. This unit is not compatible with WG 120 or WG 160 series without major adapter modifications.
