ZF 4699.003.076 GK20 | OEM Genuine Part

Overview

The ZF 4699.003.076 GK20 is a precision-engineered OEM genuine part designed for the internal valve body assembly of heavy-duty ZF construction machinery transmissions. This component functions as a critical hydraulic control element, regulating oil flow and pressure to ensure smooth gear engagement and clutch pack operation. The SKU 4699.003.076 is manufactured to exacting ZF tolerances, making it a direct replacement for worn units in the valve body stack. It sits adjacent to the main housing and works in concert with the 4699101123 HOUSING to maintain consistent hydraulic circuit integrity.

Symptoms of Failure

When the ZF 4699.003.076 GK20 begins to degrade, operators may notice specific performance issues. Common failure symptoms include:

• Erratic gear engagement or delayed shifting – The valve spool may stick due to contamination or wear, causing hesitation when moving from neutral to drive.
• Internal hydraulic pressure loss – A worn GK20 can allow oil to bypass, leading to soft clutch application and reduced torque capacity.
• Transmission overheating – Inefficient oil routing forces the system to work harder, generating excess heat.
• Intermittent slipping under load – Particularly in WG180 and WG200 models, this part failure mimics low fluid symptoms.

Technical Specifications

Compatibility

This OEM genuine part is specifically designed for ZF WG180, WG200, and WG210 series transmissions commonly found in wheel loaders, excavators, and telehandlers. It also fits select variants of the ZF 4WG-200 and 6WG-200 models used in construction machinery. The GK20 valve spool is a direct replacement for original equipment and should be installed alongside the 4699301208 HOUSING and 4699301017 BEARING COVER to ensure proper alignment. For complete assembly, the 4699301085 COVER must also be torqued to factory specifications.

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