ZF 0631.501.733 FITTED KEY for WG65 | OEM Genuine Part

Overview

The ZF 0631.501.733 FITTED KEY is a precision-engineered locating component designed for the WG 65 series transmission. This OEM genuine part ensures positive torque transfer between the output shaft and the output flange assembly, preventing rotational slippage under heavy load conditions. As a fitted key, it sits within a machined keyway to lock rotating components together, maintaining driveline integrity. The SKU 0631.501.733 is the direct factory replacement for this critical interface element, guaranteeing exact dimensional tolerances required for proper gearbox operation.

Symptoms of Failure

• Intermittent driveline clunking under load: A worn fitted key allows micro-movement between the shaft and flange, producing audible metallic knocking during acceleration or deceleration.
• Output flange wobble or vibration: When the key shears or deforms, the OUTPUT FLANGE loses concentric alignment, causing noticeable driveline vibration at highway speeds.
• Oil seepage at the output seal area: Excessive play from a degraded key can damage the TRANSMISSION HOUSING bore, leading to lubricant leaks around the output shaft seal.
• Complete loss of forward motion: A catastrophic key failure disconnects the OUTPUT from the driveline, resulting in sudden power loss with no prior warning.

Technical Specifications

Compatibility

This fitted key is engineered for the WG 65 Series transmission family, including models WG65, WG120, WG150, WG180, and WG200. It is also applicable to certain ZF Ecomat 4HP and 5HP variants that share the same output shaft keyway geometry. Always verify the keyway dimensions against your existing component before installation. The key works in conjunction with the OUTPUT FLANGE and is secured by the HEXAGON SCREW to prevent axial movement.

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