Hapens when going up and down
Check the track rollers. Lube if dry.
Check the trolley, lube as needed.
Check the long lead screw the trolley follows, lube as needed with lube for that type of opener. If it is in the motor housing, is it time for a new opener?
I had an opener that drifted in adjustment, that would go beyond the closed position a little causing the rail to bow upwards a little once closed, putting strain on the gearing shaft bearings and wore them out. I was able to order a package with the pinion gear, drive gear and sprocket and bushings, including the pulley for the opposing end in one kit.
Cautions...
-Disengage the trolley from the belt, chain or lead screw.
-Unplug the power before opening any opener covers and servicing anything inside the unit.
-Readjust the open and close travel positions
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