Operator runs but chain or belt is very loose and may slap against the rail.

Safety first: Disconnect power before adjusting chain or belt tension.

• Inspect tension: Press the chain or belt midway along the Garador rail. A small amount of sag is normal; excessive droop indicates the need for adjustment.
• Locate tensioner: At the end of the rail, find the tension adjustment nut or bolt. Refer to the Garador manual for the correct procedure.
• Adjust gradually: Tighten the tensioner in small increments until the chain/belt has about 6–12 mm of deflection when pressed lightly.
• Do not overtighten: Excessive tension can damage the motor and sprockets. Stop once the slack is removed and operation is smooth.
• Test run: Restore power and run the door through several cycles, listening for abnormal noise.