ZF 4699.817.019 GK40 | OEM Genuine Part

Overview

The ZF 4699.817.019 GK40 is a precision-engineered OEM genuine part designed for the hydraulic control system within heavy-duty construction machinery transmissions. This component functions as a critical valve or actuator element, regulating oil flow and pressure to ensure smooth gear engagement and clutch pack operation. Located within the valve body assembly of the transmission, the SKU 4699.817.019 directly influences shift quality and torque delivery. When paired with a robust BASIC GEARBOX, this part maintains the integrity of the entire drivetrain under extreme loads.

Symptoms of Failure

• Delayed or harsh shifting: A worn 4699.817.019 can cause noticeable lag when shifting between forward and reverse gears, or produce jarring engagements during acceleration.
• Intermittent transmission slippage: As internal seals degrade, hydraulic pressure drops, leading to temporary loss of power transfer under heavy load—a common “transmission slipping under load” issue.
• Contaminated hydraulic fluid: Debris from a failing GK40 component can circulate through the system, accelerating wear on the SHAFT SEAL and other downstream parts.
• Erratic clutch engagement: Operators may notice unpredictable clutch behavior, especially during low-speed maneuvering, due to inconsistent oil flow from the valve assembly.

Technical Specifications

Compatibility

This part is engineered for ZF’s heavy-duty powershift transmission series commonly used in construction machinery. It is directly compatible with the following transmission models: WG180, WG200, WG210, and WG250. These transmissions are found in wheel loaders, dozers, and graders from manufacturers like Caterpillar, Volvo, and Liebherr. For proper installation, always inspect the SEALING RING and SHIM RING to ensure correct axial clearance and leak-free operation.

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