Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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WITH MY LIFT-MASTER DOWN FOR PARTS,I'VE BEEN USING THE MANUAL MODE UNHOOKING THE TROLLEY& LIFTING.I'VE USED THIS BEFORE WITH OUT MUCH EFFORT,NOW ITS REAL HEAVY.THE DOOR CLOSES UN-EVEN WITH RIGHT SIDE CLOSED AT THE BOTTOM.THE LEFT SIDE HAS A GAP ,WITH ABOUT A 5 DEGREE ANGLE AT THE TOP. I DID NOTHING TO THE DOOR TO TILT IT. I THINK I GOT SPRING TROUBLE,MAYBE THATS WHY THE SPROCKET DRIVE GEAR GOT STRIPED?

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You are probably having either spring or lift cable troubles with the door since it is so heavy. A bad running door can strip the gears quicker than anything though. You will have to look inside the unit to see. Thanks BB

Posted on Sep 03, 2010

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