Overview
The ZF 4644.154.203 POWER TAKE-OFF is a critical OEM genuine component engineered specifically for the WG200 series transmission. This unit directs engine torque to auxiliary hydraulic systems, such as pumps for dump bodies, cranes, or refuse compactors. Mounted directly to the transmission housing, the PTO engages via a pneumatic or mechanical shift mechanism. The SKU 4644.154.203 ensures a factory-fit seal and precise gear mesh, eliminating the guesswork of aftermarket alternatives. For complete assembly integrity, this PTO works in concert with the 4644105424: DISCONNECTION unit, which isolates the driveline during stationary operation.
Symptoms of Failure
When the ZF 4644.154.203 begins to degrade, operators often notice oil leaks from the PTO housing gasket, particularly around the mounting flange. A second common symptom is gear slipping under load, where the PTO disengages unexpectedly when powering a hydraulic pump. You may also detect abnormal grinding or whining noises during engagement, indicating worn bearings or gear teeth. Finally, difficulty engaging or disengaging the PTO—often caused by a failing shift fork—can lead to costly downtime. Replacing this part alongside the 4644303538: OUTPUT FLANGE ensures the entire power take-off assembly remains balanced.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.154.203 |
| Material | High-strength cast iron housing with hardened steel gears |
| Weight | Approx. 12.5 kg (27.5 lbs) |
| Dimensions (L x W x H) | 320 mm x 180 mm x 210 mm |
| Input Speed Range | Up to 2500 RPM |
| Torque Capacity | 450 Nm (332 lb-ft) |
| Mounting Type | SAE B or C flange (dependent on transmission variant) |
| OEM Reference | ZF WG200 Series |
Compatibility
This POWER TAKE-OFF (4644.154.203) is designed for the ZF WG200 series transmissions, including models such as the WG180, WG200, and WG210. It is also compatible with select ZF Ecolife and Ecomat variants that share the same PTO mounting interface. Always verify the housing bore pattern; the 4644101224: TRANSMISSION HOUSING provides the correct alignment for this unit. For secure fastening, use the 0636021036: HEXAGON SCREW kit to prevent vibration loosening during high-torque applications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | DISCONNECTION | Isolates driveline during stationary PTO operation |
| 4644303538 | OUTPUT FLANGE | Connects PTO shaft to hydraulic pump |
| 0636021036 | HEXAGON SCREW | Secures PTO to transmission housing |
| 4644101224 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301346 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 0730365067 | TYPE PLATE | Identification label for transmission specs |
| 4644106300 | SHIFT SYSTEM | Controls PTO engagement mechanism |
| 4644306500 | COVER PLATE | Protects internal PTO components from debris |
| 4644159311 | SHIFT SYSTEM | Alternative shift assembly for remote operation |
| 4644306563 | VALVE BLOCK | Manages hydraulic pressure for PTO actuation |
