ZF 0631.100.417 FITTED KEY | OEM Genuine Part

Overview

The ZF 0631.100.417 FITTED KEY (SKU: 0631.100.417) is a precision-machined OEM genuine component engineered for torque transmission within heavy-duty ZF construction machinery transmissions. This fitted key serves as a positive-locking element between the shaft and rotating assemblies, such as gears or clutches, ensuring zero-slip power transfer under extreme loads. Located inside the transmission housing, it interfaces directly with the 4699101071: HOUSING and the 4699102106: INPUT shaft assembly. As an OEM part, it guarantees exact metallurgical composition and dimensional tolerances required for sustained performance in excavators, wheel loaders, and other off-highway equipment.

Symptoms of Failure

• Transmission gear slipping under load: A worn or sheared fitted key allows the gear to rotate independently on the shaft, causing intermittent power loss during acceleration or uphill operation.
• Abnormal metallic grinding noises: When the key fails, the shaft and gear contact surfaces wear unevenly, producing a distinct grinding sound that worsens with higher RPM.
• Oil contamination with metal particles: As the key degrades, small steel fragments enter the transmission fluid, often detected during routine oil analysis or when inspecting the magnetic drain plug.
• Sudden driveline disengagement: Complete key fracture results in total torque loss, leaving the machine immobile without prior warning—a critical safety hazard in construction environments.

Technical Specifications

Compatibility

This fitted key is designed for use in ZF WG-series transmissions commonly found in construction machinery. Based on its dimensions and application, it is compatible with the following ZF transmission models: WG180, WG200, WG210, and WG240. It also fits select variants of the Ecomat 4HP and 6HP series used in medium-duty wheel loaders and graders. For precise fitment, always cross-reference the part number against your transmission’s serial plate. The key works in conjunction with the 4699025066: GP25 gear set and the 4699103104: OUTPUT shaft assembly to maintain driveline integrity.

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