Overview
The ZF 4646.154.446 POWER TAKE-OFF (PTO) is a critical OEM genuine component engineered specifically for the WG310 and WG260 series transmissions. This unit transfers engine torque to auxiliary hydraulic systems, such as dump truck hoists or concrete mixer drums, by engaging directly with the transmission’s internal gear train. As a bolt-on assembly, it provides a reliable mechanical interface without compromising the main driveline’s integrity. The SKU 4646.154.446 is precision-machined to ZF’s original tolerances, ensuring seamless integration with the 4646101189: TRANSMISSION HOUSING and the 4646301317: HOUSING to maintain oil-tight sealing and structural alignment.
Symptoms of Failure
- Hydraulic pressure drop under load: A worn PTO gear or bearing set causes insufficient oil flow to auxiliary equipment, leading to sluggish hoist or mixer operation.
- Oil leaks at the PTO mounting flange: Deteriorated gaskets or housing cracks allow transmission fluid to escape, often visible as drips beneath the vehicle near the PTO location.
- Grinding or whining noise during engagement: Damaged gear teeth or worn shift collars produce audible metal-on-metal sounds, especially when the PTO is activated.
- Intermittent gear slipping: A failing internal clutch or worn splines cause the PTO to disengage unexpectedly, reducing hydraulic output intermittently.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.154.446 |
| OEM Reference | ZF 4646.154.446 |
| Material | High-strength cast iron housing, hardened steel gears |
| Weight (approx.) | 8.2 kg (18.1 lbs) |
| Dimensions (L x W x H) | 210 mm x 150 mm x 130 mm |
| Mounting Bolt Torque | 80 Nm (59 ft-lbs) |
| Max Input Torque | 450 Nm |
| Oil Capacity | 0.4 liters (integral) |
Compatibility
This PTO is designed for ZF’s WG series transmissions, primarily the WG310 and WG260 models. It also fits the WG180 and WG200 series when used with the correct adapter kit. The 4646.154.446 interfaces with the 0636115293: 螺栓 and 0636101153: CAP SCREW for secure attachment to the transmission housing. Always verify the PTO drive gear ratio matches your transmission’s output speed to avoid premature wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101189 | TRANSMISSION HOUSING | Encloses the main gear train and supports PTO mounting |
| 4646301317 | HOUSING | Provides structural base for auxiliary components |
| 0636115293 | 螺栓 | Fastens PTO to transmission housing |
| 0636101153 | CAP SCREW | Secures cover plates and flanges |
| 0736300232 | 螺栓 | Mounting bolt for PTO adapter brackets |
| 4475280208 | SCREW PLUG | Seals oil passages in the PTO assembly |
| 0634316523 | O-RING | Prevents oil leaks at flange joints |
| 4656306171 | VALVE BLOCK | Controls hydraulic flow to auxiliary systems |
| 4656306190 | CONNECTING HOUSING | Links PTO to hydraulic pump |
| 0501213997 | PRESSURE REGULATOR | Maintains consistent hydraulic pressure |
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