ZF 4699.025.164 GP25 | OEM Genuine Part

Overview

The ZF 4699.025.164 GP25 is a precision-engineered gear pump assembly designed for high-pressure hydraulic circuits within ZF construction machinery transmissions. This OEM genuine part, identified by SKU 4699.025.164, serves as the primary fluid mover, delivering consistent lubrication and clutch actuation pressure to the transmission’s internal components. Positioned directly on the pump drive housing, it converts mechanical input from the engine into hydraulic flow, ensuring smooth gear engagement and thermal regulation. When paired with a robust HOUSING, this unit maintains critical oil volume for the entire drivetrain.

Symptoms of Failure

When the ZF 4699.025.164 GP25 begins to wear, operators often notice a gradual loss of hydraulic pressure, leading to delayed clutch engagement or gear slipping under load. A second common failure indicator is external oil seepage around the pump mounting flange, which can be mistaken for a housing gasket leak. Third, excessive whining or cavitation noise from the transmission sump typically signals internal scoring of the pump gears. Finally, intermittent transmission overheating—especially during low-speed maneuvering—points to reduced flow capacity from a worn GP25 unit.

Technical Specifications

Compatibility

This GP25 pump is a direct replacement for ZF WG180, WG200, and WG210 series transmissions commonly used in wheel loaders, telehandlers, and excavators. It also fits select ZF 4WG-200 and 6WG-200 variants where the pump drive is configured for a 25cc unit. For proper installation, verify that the INPUT shaft spline count matches your transmission model. The pump interfaces directly with the OUTPUT flange of the transfer case. Always inspect the BRAKE PARTS assembly during pump replacement, as hydraulic contamination from a failing pump can affect brake modulation.

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