This afternoon the door went up then down properly for my son. 1 Unplug the motor of the garage-door opener. Recenly I noticed intermittent grinding noise from opener when door is opening (during last two feet of travel). I replaced 30 years old Craftsman opener with Craftsman ¾ HP Chain Drive Garage Door Opener model 139. 54990 about three weeks back. Have a chain drive 1/2 HP Crafstman Garage door opener. 4 Disconnect door-track mounting bracket from wall. Replace the gear and sprocket assembly or the drive and worm gears when they're worn and making noises. Noisy garage doors are usually caused by worn rollers, loose hardware, parts that need lubrication or an opener in need of anti-vibration pads—all simple fixes. Chain adjustment and lithium grease on sprocket did not help. 3 Unbolt and lower motor from mounting straps; set motor on top of wood blocks. 5 Place rubber pad behind mounting bracket and reattach it to the wall. 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