The Genie 33356A.S Opto-Wheel is an OEM optical encoder wheel used in select Genie residential garage door openers that employ an optical RPM sensor. Mounted on the motor shaft, this slotted wheel passes through the opener’s optical sensor to generate speed and position feedback for the control board. Accurate RPM feedback helps the operator regulate travel and detect obstructions, so replacing a damaged or warped opto-wheel can restore reliable opening and closing performance. This component is a direct replacement part for Genie openers designed with an optical RPM feedback system; verify fit by matching the 33356A.S part number with your opener’s parts list or service manual.
Installation typically involves removing the operator cover, disconnecting power, sliding the wheel onto the motor shaft near the optical sensor, and confirming the wheel runs true without rubbing or wobble. Ensure the wheel is properly aligned with the sensor and that the sensor gap is set per the opener’s documentation; improper alignment can cause erratic operation or stopping mid-travel. No electrical wiring is required for the wheel itself, and the sensor assembly is not included. After replacement, consult your owner’s manual for any required travel or force adjustments. This genuine Genie replacement is ideal for maintenance, repair, or upgrade searches such as “Genie RPM sensor wheel,” “Genie encoder wheel,” and “Genie 33356A.S Opto-Wheel,” and supports compatible Genie chain- and belt-drive openers that use optical RPM feedback.