Overview
The ZF 4644.154.478 POWER TAKE-OFF is a critical OEM genuine component engineered specifically for the WG 200 Series transmission. This unit, identified by SKU 4644.154.478, mounts directly to the transmission housing to divert engine torque to auxiliary hydraulic systems such as dump bodies, winches, or concrete mixers. Designed to withstand high cyclic loads, it ensures seamless power transfer without compromising the driveline integrity. When paired with a robust 4644101249: TRANSMISSION HOUSING, this PTO maintains precise alignment and oil flow, reducing wear on internal gears.
Symptoms of Failure
- Hydraulic system pressure loss or sluggish operation – A worn 4644.154.478 PTO often fails to engage fully, causing intermittent power loss to pumps.
- Oil seepage around the PTO mounting flange – Degraded seals lead to visible leaks, often mistaken for a failing 0634306323: O-RING.
- Grinding or whining noise during engagement – Worn bearings inside the PTO create metallic sounds, especially under load.
- Vibration at the PTO shaft – Misalignment or gear tooth damage causes noticeable shaking, accelerating wear on the 4644301402: TRANSMISSION HOUSING.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.154.478 |
| Type | Power Take-Off (PTO) |
| Material | High-grade cast iron with hardened steel gears |
| Weight | ~14.5 kg (32 lbs) |
| Mounting Interface | SAE B or C (dependent on application) |
| Torque Capacity | Up to 600 Nm (442 ft-lbs) |
| OEM Reference | ZF 4644.154.478 |
| Sealing | Integrated lip seal with O-ring groove |
Compatibility
This genuine ZF 4644.154.478 PTO is primarily designed for the WG 200 Series transmissions, including models WG180, WG200, and WG210. It also retrofits to earlier WG160 variants when used with the correct 4644301298: COVER PLATE adapter. Always verify the transmission housing flange pattern; the 4644.154.478 requires a clean, undamaged mounting surface to prevent oil leaks. For parking brake integration, ensure compatibility with the 4644109044: PARKING BRAKE assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101249 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301402 | TRANSMISSION HOUSING | Alternate housing variant for WG200 |
| 4644301298 | COVER PLATE | Seals the PTO access port |
| 0634306323 | O-RING | Prevents oil leakage at flange |
| 0636305026 | SCREW PLUG | Closes oil drain or fill ports |
| 4644301279 | SCREEN SHEET | Filters debris from hydraulic oil |
| 4644301088 | SEALING CAP | Protects unused PTO openings |
| 4644109044 | PARKING BRAKE | Holds vehicle stationary when engaged |
| 0501211070 | BRAKE | Service brake component for WG series |
| 0501317036 | PISTON | Hydraulic actuator for brake or clutch |
