ZF 0631.501.049 FITTED KEY for WG65 | OEM Genuine Part

Overview

The ZF 0631.501.049 FITTED KEY is a precision-machined locating component engineered for the WG 65 Series transmission. This OEM genuine part, identified by SKU 0631.501.049, sits within the output shaft assembly, where it functions as a positive-drive element to secure rotational alignment between the shaft and the 4616105402: OUTPUT component. By preventing relative motion under high torque loads, this fitted key ensures that power transfer remains consistent and free of backlash. It is installed directly into a keyway cut into the shaft, working in concert with the 4005303005: OUTPUT FLANGE to maintain driveline integrity. Without this key, the entire gear train would lose its mechanical lock, leading to catastrophic misalignment.

Symptoms of Failure

When the ZF 0631.501.049 FITTED KEY begins to wear or shear, operators typically notice three distinct failure modes. First, intermittent gear slipping under load occurs as the key loses its tight fit, allowing the output shaft to rotate independently of the 4616101119: TRANSMISSION HOUSING. Second, metallic debris in the transmission oil appears as the key’s hardened steel surface fractures, contaminating the lubricant and accelerating wear on adjacent bearings. Third, audible clunking during gear engagement signals that the key has partially sheared, creating excessive clearance in the driveline. A fourth symptom, vibration at highway speeds, often results from the key’s inability to maintain concentric alignment between the output flange and the shaft.

Technical Specifications

Compatibility

This FITTED KEY is specifically designed for the WG 65 Series transmission family, which includes models such as the WG180, WG200, and WG250. It is also compatible with the WG65-1 and WG65-2 variants used in medium-duty commercial vehicles and industrial power take-off applications. The part interfaces directly with the 4005303005: OUTPUT FLANGE and the 4616105402: OUTPUT assembly. For proper installation, technicians must also verify the condition of the 0636011038: HEXAGON SCREW that secures the flange, as torque specifications are critical to prevent key movement.

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