ZF 4699.817.021 GK40 | OEM Genuine Part

Overview

The ZF 4699.817.021 GK40 is a precision-engineered OEM genuine component designed for the high-torque environment of construction machinery transmissions. This part functions as a critical gear or synchronizer hub within the planetary gearset, ensuring smooth power transfer and reliable engagement under heavy load. The SKU 4699.817.021 is a direct replacement for the original factory-installed unit, guaranteeing exact fitment and performance specifications. It sits within the main drive assembly, working in concert with the 4699100080: BASIC GEARBOX to manage gear selection and torque distribution in demanding off-road applications.

Symptoms of Failure

When the ZF 4699.817.021 GK40 begins to wear, operators may notice specific performance degradation. Common failure symptoms include:

• Hard shifting or gear clash – Worn engagement teeth cause delayed or grinding gear changes, especially under load.
• Unusual whining or chattering noise – Excessive play in the hub produces metallic sounds during acceleration or deceleration.
• Intermittent power loss – The part may slip under torque, leading to momentary loss of drive in specific gears.
• Oil contamination with metallic debris – Abrasion of the component sheds fine metal particles into the transmission fluid, visible during oil changes.

Technical Specifications

Compatibility

This OEM genuine part is engineered for ZF heavy-duty powershift transmissions commonly used in construction machinery. It is directly compatible with the following transmission models:

• ZF WG180
• ZF WG200
• ZF WG210
• ZF 4WG-200

For a complete rebuild, always inspect and replace the 0634309122: SHAFT SEAL to prevent fluid leaks, and verify the condition of the 0634801038: SEALING RING for proper hydraulic pressure retention. Additionally, the 0630000091: SHIM RING must be measured and replaced if necessary to maintain correct axial clearance within the gearset.

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