STIHL 1147 640 7110 Worm Drive – Fits MS500i Chainsaw

The STIHL 1147 640 7110 Worm Drive is a genuine OEM drive gear designed for the STIHL MS500i professional chainsaw. The worm drive transfers rotational movement from the clutch drum to the oil pump, enabling the automatic lubrication system to deliver oil to the guide bar and chain.

This component is essential for maintaining proper chain lubrication during operation. If the worm drive becomes worn or damaged, the oil pump may stop functioning correctly, resulting in insufficient bar and chain lubrication.