Gliderol opener emits a high‑pitched squeal or screech when operating the door.

Safety first: Keep hands clear of moving parts while lubricating. Disconnect power if working close to the mechanism.

Steps to eliminate squeal:

• 1. Lubricate rollers and hinges: Apply silicone or light garage door lubricant to each roller bearing and hinge pivot.
• 2. Lubricate guides: Lightly spray the inside of the metal guide channels where the curtain runs.
• 3. Lubricate trolley: For sectional doors with a rail, lubricate the trolley carriage where it slides along the rail.