ZF 4699.804.031 GK25 | OEM Genuine Part

Overview

The ZF 4699.804.031 GK25 is a precision-engineered OEM genuine component designed for the hydraulic control system within ZF heavy-duty powershift transmissions. This part, identified by SKU 4699.804.031, functions as a critical valve or actuator assembly that modulates clutch pressure and fluid flow, ensuring smooth gear engagement under high torque loads. It sits directly within the transmission valve body, interfacing with the 4699101025 HOUSING and the 4699301078 HOUSING to direct hydraulic fluid precisely. As a genuine ZF part, it guarantees exact fitment and long service life in demanding construction machinery applications.

Symptoms of Failure

• Erratic gear engagement or slipping: When the 4699.804.031 wears, internal seals degrade, causing inconsistent clutch pressure and delayed shifting under load.
• Hydraulic oil leaks near the valve body: Cracks or seal failure in this part often lead to visible fluid seepage around the transmission housing, particularly near the 4699301015 HOUSING COVER.
• Transmission overheating or harsh shifts: A failing GK25 can cause pressure spikes or drops, resulting in elevated operating temperatures and jarring gear changes during operation.
• Loss of power in specific gear ranges: Worn internal components may prevent proper clutch pack engagement, leading to reduced torque delivery in forward or reverse gears.

Technical Specifications

Compatibility

This genuine ZF 4699.804.031 GK25 is primarily used in ZF WG180, WG200, and WG210 series powershift transmissions commonly found in wheel loaders, graders, and heavy forklifts. It also fits select models of the ZF 4WG-200 and 6WG-200 series. For proper installation, ensure the mating surfaces of the 4699301085 COVER are clean and free of debris. Always replace associated seals and gaskets when servicing this component.

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