Overview
The ZF 4644.124.478 POWER TAKE-OFF is a critical OEM genuine component engineered specifically for the WG 150 Series transmission. This unit transfers engine torque to auxiliary hydraulic systems, such as dump truck pumps or concrete mixer drives, by mounting directly to the transmission housing. The SKU 4644.124.478 ensures a precise fit and factory-rated performance, eliminating the guesswork of aftermarket substitutes. It interfaces seamlessly with the TRANSMISSION HOUSING (4642101047) and the TRANSMISSION HOUSING (4642301207), forming a robust assembly that withstands high-torque demands in heavy-duty applications.
Symptoms of Failure
- Hydraulic pressure drop during PTO engagement: A worn 4644.124.478 often causes insufficient oil flow to auxiliary pumps, leading to sluggish equipment response.
- Audible gear whine or grinding noise: Deteriorated internal bearings or gears produce a distinct metallic sound, especially under load, indicating imminent failure.
- External oil seepage from the PTO mounting flange: Degraded seals allow transmission fluid to escape, leaving visible puddles beneath the vehicle and risking low oil levels.
- Intermittent PTO disengagement: A failing shift mechanism may cause the PTO to slip out of gear unexpectedly, halting auxiliary operations.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4644.124.478 |
| Material | High-strength cast iron housing with hardened steel gears |
| Weight | Approximately 8.5 kg (18.7 lbs) |
| Dimensions (L x W x H) | 280 mm x 180 mm x 150 mm |
| Mounting Type | Flange-mounted, 6-bolt pattern |
| Torque Capacity | Up to 450 Nm (332 ft-lbs) |
| OEM Reference | ZF WG 150 Series |
Compatibility
This ZF 4644.124.478 POWER TAKE-OFF is designed primarily for the WG 150 Series transmission. It is also compatible with the WG 180 and WG 200 models when used with the appropriate adapter kit. The part integrates with the TYPE PLATE (0730365067) for correct identification and the GROOVED STUD (0631311009) for secure fastening. For optimal performance, verify your transmission model against the OEM specifications before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101047 | TRANSMISSION HOUSING | Encloses and supports internal transmission components |
| 4642301207 | TRANSMISSION HOUSING | Alternate housing variant for specific WG configurations |
| 0730365067 | TYPE PLATE | Provides model identification and serial number data |
| 0631311009 | GROOVED STUD | Secures PTO and housing assemblies with precise alignment |
| 4642301168 | SCREEN SHEET | Filters debris from transmission oil flow |
| 4642301169 | SCREEN SHEET | Alternative mesh filter for high-flow applications |
| 0636100621 | HEXAGON SCREW | Fastens covers and flanges with hex drive |
| 4642301186 | SCREEN SHEET | Fine-mesh screen for enhanced filtration |
| 4644106300 | SHIFT SYSTEM | Controls gear engagement and disengagement |
| 4644306500 | COVER PLATE | Seals transmission openings to prevent contamination |
