ZF 4699.803.010 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.010 GK20 is a critical OEM genuine component engineered for the internal valve body and clutch control assembly within heavy-duty ZF transmissions. This part, identified by SKU 4699.803.010, functions as a precision-machined guide or piston element that modulates hydraulic pressure to engage specific gear sets. Positioned directly within the transmission’s hydraulic control unit, it ensures consistent oil flow and clutch pack actuation. Without this component, the transmission cannot maintain proper shift timing or pressure regulation.

Symptoms of Failure

• Erratic gear engagement or delayed shifting – When the 4699.803.010 wears, hydraulic pressure drops, causing the transmission to hesitate before engaging forward or reverse gears.
• Internal oil leaks and low line pressure – A worn sealing surface on this part allows transmission fluid to bypass, leading to visible drips from the bell housing or cooler lines.
• Clutch slip under load – Operators may notice the engine revving without corresponding acceleration, particularly when climbing grades or hauling heavy loads.
• Overheating transmission fluid – Inefficient pressure regulation forces the torque converter to work harder, generating excessive heat and shortening fluid life.

Technical Specifications

Compatibility

This OEM genuine part is designed for use in ZF WG180, WG200, and WG211 series transmissions commonly installed in construction machinery such as wheel loaders, graders, and telehandlers. It is also compatible with select ZF 4WG-200 and 6WG-200 variants. Always verify your transmission model before ordering.

During installation, this GK20 component interfaces directly with the 4699101046 HOUSING and the 4699301109 HOUSING. The 4699301017 BEARING COVER and 4699301085 COVER are also mounted in the same valve body assembly, ensuring proper alignment and sealing of the hydraulic circuit.

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