ZF 0631.607.120 SET SCREW for WG180 | OEM Genuine Part

Overview

The ZF 0631.607.120 SET SCREW is a precision-engineered OEM fastening component specifically designed for the WG 180 series of heavy-duty transmissions. This genuine ZF part plays a critical role in securing internal assemblies within the gearbox, ensuring that key components remain locked in position under high torque and vibration. The SKU 0631.607.120 is often replaced during a full transmission overhaul, as it works in concert with the 4644105475: DISCONNECTION mechanism and the 4642303097: OUTPUT FLANGE to maintain driveline integrity. Without this set screw, the 4644101134: TRANSMISSION HOUSING cannot properly retain its internal load paths.

Symptoms of Failure

• Transmission oil seepage at the housing joint: When the set screw loosens, it creates a gap that allows ATF fluid to escape, often mistaken for a gasket failure.
• Audible clicking or rattling from the gearbox: A worn 0631.607.120 screw permits axial play in the shaft assembly, causing metallic noise during gear engagement.
• Intermittent loss of drive power: If the set screw fails completely, the 0636020211: HEXAGON SCREW and output flange can shift, leading to partial disconnection of the driveline.
• Vibration during low-speed operation: Looseness in the set screw introduces imbalance, felt as a shudder through the chassis when pulling away from a stop.

Technical Specifications

Compatibility

This set screw is primarily engineered for the ZF WG 180 series transmissions. Based on its thread pattern and load rating, it is also compatible with the WG 200 and WG 150 series in certain configurations. It is a direct replacement for the OEM part found in ZF Ecomat and Ecolife variants where the housing uses a M12 retention point. Always verify the thread pitch against your specific 4644301349: HOUSING before installation.

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