Overview
The ZF 4661.155.002 POWER TAKE-OFF is an OEM genuine component engineered specifically for the WG 94 Series transmission family. This PTO unit transfers engine torque to auxiliary hydraulic systems, such as pumps for dump trailers, concrete mixers, or refuse collection equipment. Positioned on the transmission housing, it engages via a pneumatic or mechanical shift mechanism to deliver reliable power output. The SKU 4661.155.002 ensures direct compatibility with factory specifications, eliminating fitment guesswork. When installed alongside the 4661101024: TRANSMISSION HOUSING and 4661301054: HOUSING II, this PTO forms a sealed, high-torque assembly critical for demanding vocational applications.
Symptoms of Failure
When the 4661.155.002 PTO begins to wear, operators may notice these specific failure indicators:
- Oil leaks at the PTO mounting flange – Worn gaskets or housing cracks allow transmission fluid to escape, often visible as drips beneath the vehicle.
- Gear slipping under load – Internal gear teeth or shift fork wear causes intermittent engagement, especially during high-torque hydraulic operation.
- Unusual grinding or whining noise – Bearing degradation or misalignment produces audible metallic sounds when the PTO is engaged.
- Delayed or incomplete engagement – Pneumatic or mechanical shift mechanisms fail to lock the PTO fully, reducing hydraulic pump output.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.155.002 |
| OEM Reference | ZF WG94 Series PTO |
| Material | High-grade cast iron housing with hardened steel gears |
| Weight | Approx. 8.5 kg (18.7 lbs) |
| Dimensions (L x W x H) | 280 mm x 180 mm x 150 mm |
| Mounting Type | SAE standard flange with 6-bolt pattern |
| Max Torque Capacity | 450 Nm (332 ft-lbs) |
| Shift Mechanism | Pneumatic or mechanical (dependent on application) |
Compatibility
This genuine PTO is designed for the ZF WG 94 Series transmission family, which includes models such as WG180, WG200, WG210, and WG240. It also fits select variants of the WG94 and WG98 series used in medium-duty trucks, construction equipment, and municipal vehicles. Always verify the transmission model and housing interface before installation. The 0631306174: CYLINDRICAL PIN is required for precise alignment during assembly, and the 0769123894: TYPE PLATE provides critical identification for OEM verification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101024 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4661301054 | HOUSING II | Secondary housing for PTO mounting interface |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise housing positioning |
| 0769123894 | TYPE PLATE | Identification tag with OEM specifications |
| 0750100022 | SCREW PLUG | Seals oil passages in the housing |
| 4660201008 | SCREW PLUG | Drain or fill port plug |
| 0636100117 | SCREW PLUG | Threaded sealing plug for auxiliary ports |
| 0501211384 | VALVE | Controls pneumatic shift engagement |
| 0732042156 | COMPRESSION SPRING | Provides return force for shift mechanism |
| 0768409154 | SCREW PLUG | High-pressure sealing plug for PTO circuit |
