Overview
The ZF 4644.154.026 POWER TAKE-OFF is a critical OEM genuine component engineered specifically for the WG 201 Series transmission family. This PTO unit provides a reliable mechanical interface to drive auxiliary hydraulic pumps, compressors, or generators directly from the transmission’s gear train. Designed to handle high torque loads in demanding industrial applications, the 4644.154.026 ensures seamless power extraction without compromising transmission integrity. The SKU 4644.154.026 is precision-machined to ZF’s exacting tolerances, guaranteeing a direct bolt-on replacement that restores full auxiliary power functionality. It mounts securely to the transmission housing, where it engages with internal gears to deliver consistent rotational output for your vehicle’s secondary systems.
Symptoms of Failure
- Oil leaks around the PTO mounting flange: Worn seals or gaskets on the 4644.154.026 often cause transmission fluid to seep out, leaving visible drips under the vehicle and reducing hydraulic pressure.
- Intermittent or complete loss of auxiliary power: When internal gears or bearings degrade, the power take-off may slip or fail to engage, leading to erratic pump operation or a total loss of hydraulic function.
- Unusual grinding or whining noises during engagement: Damaged gear teeth or worn bushings produce audible metallic sounds, especially under load, indicating imminent failure of the PTO assembly.
- Vibration transmitted through the driveline: A failing 4644.154.026 can cause noticeable shaking in the transmission housing and connected equipment, often worsening as RPM increases.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4644.154.026 |
| Product Type | Power Take-Off (PTO) |
| Material | High-strength cast iron 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 |
| OEM Reference | ZF 4644.154.026 |
| Torque Capacity | Up to 450 Nm (332 ft-lbs) |
| Mounting Type | Flange-mounted, 6-bolt pattern |
Compatibility
This genuine ZF 4644.154.026 power take-off is designed for the WG 201 Series transmissions, including models such as the WG180, WG200, and WG210. It is also compatible with earlier WG160 variants and certain WG150 configurations that share the same PTO mounting interface. For proper fitment, verify that your transmission’s housing matches the 6-bolt flange pattern and gear engagement depth. Always consult your vehicle’s service manual or cross-reference the existing PTO part number before installation.
Installation and Related Components
When replacing the 4644.154.026, it is essential to inspect adjacent transmission components for wear. The 4644101160: TRANSMISSION HOUSING provides the structural foundation for the PTO mount, while the 4644301323: TRANSMISSION HOUSING offers an alternative casting variant for specific WG201 builds. A worn 4644301189: THREADED BUSH can cause misalignment, leading to premature PTO failure. Additionally, the 4475280043: SCREW PLUG seals the housing opening and must be replaced if damaged to prevent fluid loss. Using OEM components ensures optimal sealing and torque retention.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101160 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4644301323 | TRANSMISSION HOUSING | Alternative housing for WG201 variants |
| 4644301189 | THREADED BUSH | Alignment guide for PTO mounting |
| 4475280043 | SCREW PLUG | Seals housing opening |
| 0634306198 | O-RING | Fluid seal between components |
| 0730365067 | TYPE PLATE | Identification label for transmission |
| 4644301161 | COVER PLATE | Protects housing opening |
| 0636100621 | HEXAGON SCREW | Fastener for housing assembly |
| 0631610020 | SET SCREW | Secures internal components |
| 0501218540 | BREATHER | Vents pressure from housing |
