Overview
The ZF 4651.154.004 POWER TAKE-OFF is a critical OEM genuine component engineered for the WG 100 Series transmission family. 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 geartrain. As a bolt-on assembly, it sits on the PTO aperture of the main transmission housing, converting rotational power into hydraulic flow. The SKU 4651.154.004 is precision-machined to ZF’s exacting tolerances, ensuring seamless integration with the 4651101007: TRANSMISSION HOUSING and the 4651301029: HOUSING assembly. This part is not a generic replacement; it is the exact unit specified for WG100 applications, guaranteeing factory-matched performance and durability.
Symptoms of Failure
When the ZF 4651.154.004 POWER TAKE-OFF begins to wear, operators may notice distinct operational issues. Look for these specific failure symptoms to diagnose problems early:
- Hydraulic pressure drop under load: If auxiliary equipment loses power or operates sluggishly, the PTO’s internal clutch or gear engagement may be slipping, reducing oil flow.
- Oil leaks at the PTO mounting flange: A degraded 0634303928: O-RING or housing seal can cause transmission fluid to weep from the joint, leading to low fluid levels and potential gear damage.
- Grinding or whining noise during engagement: Worn bearings or misaligned gears inside the PTO produce audible metal-on-metal sounds, especially when shifting the PTO into or out of gear.
- Intermittent PTO disengagement: A failing shift mechanism or internal spring may cause the PTO to unexpectedly drop out of gear, interrupting hydraulic functions mid-operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4651.154.004 |
| Product Type | Power Take-Off (PTO) Assembly |
| Material | High-strength cast iron housing with hardened steel gears |
| Weight (approx.) | 18.5 kg (40.8 lbs) |
| Mounting Interface | SAE B 2-bolt or 4-bolt pattern (dependent on housing) |
| OEM Reference | ZF 4651.154.004 (Genuine) |
| Operating Pressure | Up to 25 bar (362 psi) |
| Max Input Torque | 600 Nm (442 lb-ft) |
Compatibility
This ZF 4651.154.004 POWER TAKE-OFF is specifically designed for the WG 100 Series transmission, but its mounting pattern and gear ratios also allow it to fit select models in the WG180 and WG200 families when used with the correct adapter housing. It is fully compatible with transmissions that utilize the 4651301024: HOUSING as a mounting base. Always verify the PTO aperture configuration on your specific ZF transmission before installation. For WG100 applications, this part is a direct bolt-on replacement requiring no modifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for the transmission assembly |
| 4651301029 | HOUSING | PTO mounting adapter housing |
| 0634303928 | O-RING | Seals the PTO-to-housing interface |
| 4651301024 | HOUSING | Alternate PTO mounting housing variant |
| 4651203002 | SCREEN SHEET | Oil filter screen for the transmission sump |
| 4651303005 | SCREEN SHEET | Secondary oil filtration screen |
| 0636101032 | CAP SCREW | Fastener for housing and cover plates |
| 0630361028 | SEALING CAP | Protective cap for unused ports |
| 4475280060 | SCREW PLUG | Threaded plug for drain or fill holes |
| 0634303312 | O-RING | Seal for screw plug or cap screw |
