Overview
The ZF 4646.156.428 Power Take-Off (PTO) is a critical auxiliary power interface engineered for the WG260 series and compatible ZF transmissions. This OEM genuine part, identified by SKU 4646.156.428, mounts directly to the transmission housing to divert engine torque to hydraulic pumps, compressors, or other driven equipment. It operates by engaging a gear train within the transmission, providing a reliable mechanical link for mobile and industrial applications. When installed correctly, this PTO ensures seamless power transfer without compromising the main driveline’s integrity.
Symptoms of Failure
- Hydraulic pump performance loss: A worn 4646.156.428 often causes insufficient hydraulic pressure, leading to sluggish equipment operation and reduced lifting capacity.
- Audible gear whine or grinding: Damaged internal bearings or gears produce a distinct whining noise during engagement, especially under load, indicating imminent failure.
- Oil seepage at the mounting flange: Degraded seals allow transmission fluid to leak around the PTO housing, leaving visible drips on the transmission casing and surrounding components.
- Intermittent engagement or slipping: Worn shift mechanisms cause the PTO to disengage unexpectedly, resulting in erratic pump operation and potential system shutdowns.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4646.156.428 |
| OEM Reference | ZF 4646.156.428 |
| Material | High-strength cast iron housing with hardened steel gears |
| Weight | Approximately 8.2 kg (18.1 lbs) |
| Overall Dimensions | 210 mm x 180 mm x 140 mm |
| Mounting Bolt Pattern | 6-hole SAE standard |
| Input Speed Range | Up to 2500 RPM |
| Torque Capacity | 450 Nm (332 ft-lbs) |
Compatibility
This genuine ZF Power Take-Off is designed for the WG260 transmission series and is also compatible with the WG 258, WG 261, WG 308, WG 310, and WG 311 models. It fits applications requiring a side-mounted PTO with standard SAE flange dimensions. For proper installation, ensure the transmission housing is free of debris and that the TRANSMISSION HOUSING (4646101156) is in good condition. Secure the unit using the HEXAGON SCREW (0636015304) and CAP SCREW (0636101828) for a vibration-resistant fit. The HOUSING (4646301327) provides additional structural support for the assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101156 | TRANSMISSION HOUSING | Encloses and supports transmission gears and shafts |
| 4646301327 | HOUSING | Provides mounting surface and oil containment for PTO |
| 0636015304 | HEXAGON SCREW | Secures PTO to transmission housing |
| 0636101828 | CAP SCREW | Fastens cover plates and flanges |
| 4646301102 | COVER SHEET | Protects internal components from debris |
| 4646301285 | COVER SHEET | Seals access openings on transmission |
| 0730365190 | TYPE PLATE | Identifies transmission model and serial number |
| 0631311009 | GROOVED STUD | Provides alignment and threaded mounting points |
| 0636101193 | CAP SCREW | Fastens cover sheets and brackets |
| 0636010179 | HEXAGON SCREW | General-purpose fastener for transmission assembly |
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