ZF 4699.825.255 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.255 GP25 is a critical OEM genuine gear pump assembly engineered for high-torque applications within ZF construction machinery transmissions. This component serves as the primary hydraulic pressure source, delivering precise oil flow to actuate clutch packs and lubrication circuits. As a direct replacement for the SKU 4699.825.255, this GP25 unit ensures consistent hydraulic performance under extreme load conditions. Positioned on the transmission’s auxiliary drive pad, it interfaces directly with the INPUT shaft assembly to generate the necessary pressure for gear engagement.

Symptoms of Failure

When the 4699.825.255 GP25 begins to degrade, operators may notice slow or erratic clutch engagement during shifting, particularly under heavy load. A second common failure sign is audible whining or cavitation noise from the transmission pump area, indicating internal wear or air ingestion. Third, intermittent loss of hydraulic pressure can cause the transmission to slip out of gear on inclines. Finally, visible oil seepage around the pump mounting flange often points to a compromised seal or housing crack, requiring immediate inspection of the HOUSING assembly.

Technical Specifications

Compatibility

This GP25 pump is engineered for the ZF WG180, WG200, and WG210 series powershift transmissions commonly found in wheel loaders, dozers, and graders. It also fits select models of the ZF Ergopower and Ecolife transmission families used in construction machinery. For proper installation, ensure the GP25 drive gear aligns correctly with the OUTPUT shaft splines. Always replace the HOUSING gasket and check the INPUT shaft for wear during pump service.

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