ZF 4699.825.188 GP25 | OEM Genuine Part

Overview

The ZF 4699.825.188 GP25 is a precision-engineered gear pump assembly designed for high-pressure hydraulic circuits within ZF heavy-duty powershift transmissions. This OEM genuine part, identified by SKU 4699.825.188, serves as the primary hydraulic power source, delivering pressurized oil to actuate clutch packs, modulate shift valves, and lubricate internal gear sets. Located on the transmission’s pump drive housing, it converts mechanical input from the engine into fluid flow essential for torque converter charging and clutch engagement. The GP25 designation indicates a specific displacement and pressure rating tailored for construction machinery applications, ensuring consistent flow under extreme load cycles.

Symptoms of Failure

When the ZF 4699.825.188 GP25 begins to degrade, operators often notice delayed clutch engagement or sluggish gear shifts, particularly when the transmission is cold. A second common symptom is erratic or surging hydraulic pressure, which manifests as harsh shifting or momentary loss of drive under heavy load. You may also observe external oil seepage around the pump mounting flange or drive shaft seal, leading to gradual fluid loss. Finally, abnormal whining or grinding noises from the transmission housing during idle or acceleration indicate internal wear of the pump’s gerotor elements or bearings.

Technical Specifications

Compatibility

This GP25 pump is primarily used in ZF WG180, WG200, and WG210 series powershift transmissions found in wheel loaders, graders, and excavators. It also fits select 4WG-200 and 6WG-200 variants used in off-highway trucks. The 4699.825.188 replaces earlier GP20 pumps in these models, offering improved volumetric efficiency. For complete pump rebuilds, always pair this unit with a new 4699025040 GP25 seal kit and inspect the 4699101114 HOUSING for cracks. The 4699102157 INPUT shaft and 4699103114 OUTPUT flange must be checked for spline wear during installation.

Related Components