ZF 4699.803.076 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.076 GK20 is a critical OEM genuine component designed for heavy-duty construction machinery transmissions. This part functions as a precision-machined shift element or actuator housing within the transmission valve body assembly, directing hydraulic fluid flow to engage specific gear sets. The SKU 4699.803.076 is engineered to withstand extreme pressure cycles and thermal stress common in excavators, wheel loaders, and graders. It interfaces directly with the 4699101123 HOUSING and the 4699301208 HOUSING to form a sealed hydraulic circuit, ensuring precise clutch pack engagement during operation.

Symptoms of Failure

When the ZF 4699.803.076 GK20 begins to degrade, operators will notice distinct performance issues. Delayed gear engagement is a primary symptom, often accompanied by a momentary loss of power when shifting from neutral to drive. Hydraulic fluid seepage around the transmission housing joint is another common failure indicator, caused by micro-cracks in the GK20 casting. Erratic shifting patterns—where the transmission hunts between gears or fails to hold a selected ratio—signal internal wear. Finally, contaminated transmission oil with metallic debris may appear, as the part’s internal passages erode over time.

Technical Specifications

Compatibility

This OEM genuine GK20 component is engineered for ZF’s medium-to-heavy-duty powershift transmission series. It is directly compatible with the WG180, WG200, and WG210 transmission models, commonly found in construction machinery from Caterpillar, Volvo, and Liebherr. The part also integrates with the 4699301017 BEARING COVER and the 4699301085 COVER to complete the valve body assembly. For optimal sealing, always pair this component with the 0634303141 O-RING and the 0501329618 VENT VALVE during installation.

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