48+ Garage Door Opener Chain Tension Adjustment Gif. Repeat the same adjustment at the pulley and spring adjuster. Garage door travel limit adjustment.
1/2 hp 315mhz garage door opener for residential use only.
There are only a few ways that the chain can be tightened. A sagging chain is a result of normal usage of the garage door opener. If the chain sags more than 1/2 inch below the rail, it may bang against the rail and a door that fails to open fully can be fixed by adjusting the limit screws. This is used to adjust the chain tension.