ZF 4699.803.024 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.024 GK20 is a precision-engineered OEM genuine part designed for the valve body or clutch control assembly within ZF heavy-duty powershift transmissions. This component, identified by SKU 4699.803.024, plays a critical role in regulating hydraulic fluid flow to ensure smooth gear engagement and consistent torque delivery under high-load conditions. Commonly found in construction machinery such as wheel loaders and graders, the GK20 unit directly interfaces with the main housing assembly. For optimal sealing and structural integrity, this part is often installed alongside the 4699101046 HOUSING and the 4699301109 HOUSING, which provide the necessary mounting points and fluid channels.

Symptoms of Failure

When the ZF 4699.803.024 GK20 begins to wear, operators may notice several distinct performance issues. Delayed or harsh shifting is a primary indicator, often caused by internal leakage past the GK20 spool or valve seat. Another common symptom is intermittent gear slippage under load, particularly when the transmission is hot, as worn tolerances reduce hydraulic pressure. You may also observe erratic clutch engagement during directional changes, leading to jerky machine movements. Finally, visible hydraulic oil seepage around the valve body area can occur if the GK20’s sealing surfaces degrade, often requiring replacement of the 4699301017 BEARING COVER and the 4699301085 COVER during the same service interval.

Technical Specifications

Compatibility

This GK20 valve component is engineered for use in ZF’s WG series powershift transmissions, specifically the WG180 and WG200 models. It is also compatible with the WG150 and WG160 series used in mid-size construction equipment. Always verify your transmission serial number before ordering. For complete assembly, ensure the 4699301014 THREAD PROTECTIVE SHIELD and 0634303141 O-RING are inspected for wear.

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