The Genie 39591A.S Belt and Chain Pulley is a genuine OEM replacement pulley for select Genie belt‑drive and chain‑drive garage door openers. Positioned at the powerhead end of the rail, this pulley guides and supports the drive belt or chain so the trolley can move smoothly during open and close cycles. Replacing a worn or noisy pulley restores proper tracking, reduces vibration, and helps maintain consistent door travel on compatible residential Genie garage door opener systems.
Use this service part when the existing drive pulley shows signs of wear, wobble, or binding. For compatibility, match part number 39591A.S to the parts diagram in your opener’s manual or on the manufacturer’s website using your opener’s model number from the powerhead label. Installation typically involves disconnecting power, releasing belt/chain tension at the turnbuckle, removing the retaining clip or fastener, swapping the pulley, then re-tensioning to specification and verifying alignment. After replacement, recheck travel limits and perform standard safety reverse tests with properly aligned photo-eyes. Always support the door, keep hands clear of moving parts, and follow Genie’s service instructions to ensure safe, reliable operation. This OEM pulley is an ideal replacement part for maintaining Genie belt and chain drive systems in residential applications.