ZF 4699.803.032 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.032 GK20 is a genuine OEM component engineered for the hydraulic control system within ZF heavy-duty powershift transmissions. This part functions as a critical interface between the valve body and the clutch pack, regulating oil flow to ensure precise gear engagement under high torque loads. As a direct replacement for the SKU 4699.803.032, it is designed to restore factory-specified shift timing and prevent pressure loss in construction machinery applications. The GK20 assembly is typically mounted inside the main transmission housing, where it interacts directly with the 4699101046 HOUSING to maintain structural integrity during operation.

Symptoms of Failure

When the 4699.803.032 GK20 wears out, operators often notice delayed gear engagement when shifting from neutral to drive under load. A second common symptom is intermittent clutch slip during uphill travel, which manifests as a sudden RPM flare without corresponding speed increase. Third, erratic shift quality—such as harsh or soft shifts—can indicate internal leakage past the GK20 sealing surfaces. Finally, visible oil seepage around the transmission housing joint may occur if the component’s mating face becomes compromised, often requiring inspection of the adjacent 4699301109 HOUSING for cracks.

Technical Specifications

Compatibility

This GK20 component is primarily used in ZF WG180 and WG200 series transmissions, which are common in wheel loaders, graders, and compact excavators. It also fits select WG150 and WG250 models produced after 2005. For proper installation, ensure the 4699301017 BEARING COVER is torqued to specification, and verify that the 4699301085 COVER is free of burrs before assembly. Always replace the O-ring and shaft seal when servicing this part.

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