RY40104 (107928023) Ryobi Lawn Mower - Overview

This is an OEM replacement part for use in Ryobi lawn mowers. The knob is made out of plastic. No tools should be needed during the installation of this part. It may become broken and will need to be replaced. This item is sold individually.

Uneven cutting or excessive deck vibration may indicate a cracked, distorted, or damaged blade adapter. The holder supports the blade on the motor shaft and maintains alignment during operation. First check that the blade is balanced, the retaining hardware is tight, and the shaft is not bent. Match the replacement to the full mower model...Read more because mounting profiles can differ. Disconnect every power source before reaching beneath the deck and handle the blade carefully. Install all washers and spacers in their original order, then verify that the blade sits flat and rotates without interference.