Overview
The ZF 4644.154.418 POWER TAKE-OFF (PTO) is a critical OEM genuine component engineered for the WG180 and WG200 series transmissions. This unit transfers engine torque to auxiliary hydraulic systems, such as dump bodies, winches, or concrete mixers, by engaging directly with the transmission’s gear train. As a factory-specified part, the SKU 4644.154.418 ensures precise alignment and load capacity, reducing wear on adjacent assemblies. It mounts externally on the transmission housing, interfacing with the TRANSMISSION HOUSING and the HOUSING to maintain structural integrity under high-torque applications.
Symptoms of Failure
- Hydraulic oil leaks around the PTO mounting flange: Worn seals or gaskets cause fluid seepage, often visible as drips beneath the vehicle, indicating the 4644.154.418 unit needs replacement.
- Intermittent gear slipping or failure to engage: Internal wear on the shift collar or splines results in partial torque transfer, leading to erratic auxiliary equipment operation.
- Unusual grinding or whining noises during PTO activation: Damaged bearings or misaligned gears produce metallic sounds, signaling imminent failure of the power take-off assembly.
- Reduced hydraulic system pressure or performance: A failing PTO cannot sustain required output, causing sluggish lift or rotation cycles in attached implements.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.154.418 |
| Weight | 4.2 kg (9.3 lbs) |
| Material | High-strength cast iron with hardened steel gears |
| Dimensions (L x W x H) | 210 mm x 150 mm x 120 mm |
| OEM Reference | ZF 4644.154.418 (Genuine) |
| Torque Capacity | 450 Nm (332 ft-lb) |
| Mounting Type | Flange-mounted, 6-bolt pattern |
Compatibility
This genuine ZF power take-off is specifically designed for the WG180 and WG200 transmission series. It is compatible with all sub-variants of these models, including WG180-1, WG180-2, WG200-1, and WG200-2, commonly found in medium-duty trucks, construction vehicles, and municipal equipment. The 4644.154.418 unit replaces earlier PTO designs and integrates with the TYPE PLATE for identification and the GROOVED STUD for secure mounting. Verify your transmission serial number against the OEM parts catalog to ensure exact fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101208 | TRANSMISSION HOUSING | Encloses and supports transmission gears and shafts |
| 4644301333 | HOUSING | Provides mounting surface and oil containment for PTO |
| 0730365125 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Secures PTO to transmission housing with anti-rotation groove |
| 0636305019 | SCREW PLUG | Seals oil passages in the PTO assembly |
| 4644301247 | THREADED BUSH | Provides wear-resistant thread for mounting bolts |
| 0634303485 | O-RING | Prevents oil leaks between PTO and housing |
| 4644301257 | ADAPTER | Converts PTO output flange to different pump configurations |
| 0634306023 | O-RING | Seals adapter-to-PTO interface |
| 4644106231 | SHIFT SYSTEM | Controls engagement and disengagement of PTO gears |
