Overview
The ZF 4644.156.004 POWER TAKE-OFF is an OEM genuine component engineered specifically for the WG 200 Series transmission family. This PTO unit provides a mechanical power interface, enabling auxiliary equipment such as hydraulic pumps or compressors to draw engine torque directly from the transmission. Positioned on the side of the main gearbox, the 4644.156.004 engages via a sliding clutch mechanism, ensuring reliable power transfer without interrupting the driveline. As a factory-spec part, this SKU guarantees exact fitment and long service life in demanding industrial applications.
Symptoms of Failure
When the ZF 4644.156.004 begins to wear, operators may notice several distinct failure indicators. Oil leaks around the PTO mounting flange are common, often caused by degraded seals or gasket fatigue. Gear slipping or intermittent engagement during load cycles suggests worn clutch teeth or internal bearing play. Another frequent issue is unusual grinding or whining noises when the PTO is engaged, pointing to bearing degradation or insufficient lubrication. Finally, vibration through the chassis during PTO operation can indicate misalignment or a failing output shaft support.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.156.004 |
| Product Type | Power Take-Off (PTO) |
| Material | High-tensile cast iron housing, hardened steel gears |
| Weight | Approx. 12.5 kg (27.5 lbs) |
| Dimensions (L x W x H) | 280 mm x 180 mm x 160 mm |
| OEM Reference | ZF 4644.156.004 |
| Mounting Type | Flange-mounted, 6-bolt pattern |
| Max Torque Capacity | 600 Nm (442 lb-ft) |
Compatibility
This genuine ZF 4644.156.004 Power Take-Off is primarily designed for the WG 200 Series transmissions, including models such as the WG180, WG200, and WG210. It also fits select variants of the ZF Ecomat and Ecolife series when used with the appropriate adapter kit. Always verify your transmission model and housing configuration before ordering. For a complete assembly, this PTO integrates directly with the 4644105424 DISCONNECTION mechanism and the 4644303538 OUTPUT FLANGE. Secure installation requires the 0636021036 HEXAGON SCREW kit, while the 4644101224 TRANSMISSION HOUSING provides the structural mounting point.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105424 | Disconnection | Engages/disengages PTO from transmission |
| 4644303538 | Output Flange | Connects PTO shaft to auxiliary equipment |
| 0636021036 | Hexagon Screw | Fastens PTO assembly to transmission housing |
| 4644101224 | Transmission Housing | Main structural casing for gearbox |
| 4644301346 | Transmission Housing | Alternate housing variant for WG series |
| 0730365067 | Type Plate | Identification label for transmission model |
| 4644106300 | Shift System | Controls gear selection and PTO engagement |
| 4644306500 | Cover Plate | Protects internal components from debris |
| 4644159311 | Shift System | Secondary shift mechanism for PTO |
| 4644306563 | Valve Block | Hydraulic control unit for PTO actuation |
