My garage door suddenly stopped working (Sears 1/2 hp opener, been working great til now). When I try to open the door I hear the sound of the motor running but the chain don't move to pull the door. Any idea how can I fix this issue?
Stripped white plastic gear in the main box. Very common problem on SEARS openers. Take down model number and go Sears site. They have repair kits for them.
Joed is most likely right. The part number is 41A2817 and is available at Sears or any good door opener service company. It also comes with instructions.