ZF 4699.803.034 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.034 GK20 is a critical OEM genuine component engineered for the hydraulic control system within ZF heavy-duty transmissions. Positioned as a valve or actuator assembly, this part regulates oil flow and pressure to ensure precise clutch engagement and gear selection in construction machinery. The SKU 4699.803.034 is manufactured to ZF’s exacting tolerances, making it a direct replacement for worn units in high-stress environments. It interfaces directly with the 4699101046 HOUSING and the 4699301109 HOUSING, forming a sealed assembly that directs hydraulic fluid to the transmission’s clutches.

Symptoms of Failure

When the ZF 4699.803.034 begins to fail, operators often notice delayed gear engagement or harsh shifting under load. A common long-tail search query is “ZF transmission slow to engage forward gear,” which frequently traces back to this part. Another symptom is intermittent loss of drive in specific ranges, particularly when the transmission is hot. You may also observe external oil seepage around the 4699301017 BEARING COVER or the 4699301085 COVER, indicating internal seal failure within the GK20 assembly. Finally, erratic pressure readings on a diagnostic gauge often point to internal spool wear or contamination within this component.

Technical Specifications

Compatibility

This OEM genuine part is primarily compatible with ZF WG180, WG200, and WG210 series transmissions used in wheel loaders, graders, and telehandlers. It also fits select variants of the ZF 4WG-200 and 6WG-200 powershift models. Always verify your transmission serial number against the GK20 designation to ensure proper fitment. The part is designed to work in conjunction with the 4699101046 HOUSING and 4699301109 HOUSING for correct hydraulic routing.

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