Overview
The ZF 4646.156.431 POWER TAKE-OFF is a critical OEM genuine component engineered specifically for the WG 251 Series transmission. This unit, identified by SKU 4646.156.431, serves as the primary interface for transferring engine power to auxiliary hydraulic systems, such as dump bodies, winches, or concrete mixers. Mounted directly to the transmission housing, it engages with the internal gearing to deliver reliable torque output. For optimal sealing and structural integrity, this PTO works in conjunction with the 4646101143: TRANSMISSION HOUSING and the 4646301202: HOUSING, ensuring precise alignment within the drivetrain assembly.
Symptoms of Failure
When the 4646.156.431 POWER TAKE-OFF begins to wear, operators may notice distinct performance issues. Common failure indicators include hydraulic oil leaks around the PTO mounting flange, often caused by degraded seals. Another symptom is gear slipping under load, where the auxiliary system loses power during operation. You might also hear grinding or whining noises when engaging the PTO, signaling worn bearings or gear teeth. Finally, difficulty engaging or disengaging the unit can occur, leading to intermittent power delivery. Addressing these signs early prevents damage to the 4646301172: COVER and surrounding components.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4646.156.431 |
| OEM Reference | ZF WG 251 Series |
| Material | High-strength cast iron with hardened steel gears |
| Weight | Approx. 12.5 kg (27.5 lbs) |
| Dimensions (L x W x H) | 280 mm x 180 mm x 150 mm |
| Mounting Type | Flange-mounted with 6-bolt pattern |
| Torque Capacity | Up to 600 Nm |
| Seal Type | Double-lip oil seal |
Compatibility
This POWER TAKE-OFF is primarily designed for the ZF WG 251 Series transmission, but it also fits select models in the WG180, WG200, and WG210 families. It is commonly used in medium-duty trucks, construction equipment, and municipal vehicles. Always verify the PTO mounting interface and gear ratio against your specific transmission variant. For secure fastening, use the 0636101051: CAP SCREW to ensure proper torque retention during high-vibration operations.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101143 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4646301202 | HOUSING | Secondary housing for auxiliary components |
| 4646301172 | COVER | Seals and protects internal mechanisms |
| 0636101051 | CAP SCREW | High-tensile fastener for secure mounting |
| 4646201019 | COVER SHEET | Thin protective plate for debris exclusion |
| 4646301277 | SCREEN SHEET | Filter mesh for hydraulic fluid flow |
| 0730365067 | TYPE PLATE | Identification label with serial data |
| 0631311009 | GROOVED STUD | Alignment pin for precise assembly |
| 0636010216 | HEXAGON SCREW | Standard bolt for general fastening |
| 0636010174 | HEXAGON SCREW | Alternate length bolt for varied mounts |
