Terrible, are the instructions that came with my Chamberlain LiftMaster Professional garage door opener 1355C, 1/2 hp. Sure, read them, but if you have no clue then try my rough adjustment guideline as a start.
My idler bolt broke, sending my chain flopping down. When I replaced my idler bolt, I had no idea how to get the chain adjusted. Firstly, close your opener. The trolley should be close to your door. put some slack in your chain and then route it through the opener’s gear. Then tighten everything up. Damn there’s nothing about this in the manual. I had to do this by trial and error three times, slackening, getting it into the gears, tightening, repeat 3 times. What a hassle. Clearer instructions would have been a time and frustration saver.
Chamberlain LiftMaster 1355C garage door opener, idler bolt sheared off. Photo3 by Don Tai, Toronto, Canada
Impressed, I am not, when my garage door opener stopped working. I have a Chamberlain LiftMaster garage door opener, model 1355C 1/2 hp in chain drive. The failure of the idler bolt was catastrophic.
There is a metal gear on the motor, which moves a metal chain in an oval, opening and closing the garage door. At the door side, opposite to the door opener, the chain makes a 180 degree turn back to the opener on a plastic wheel, called the idler. The wheel is fine, but the metal bolt that keeps the idler attached to the metal rail sheared off at the threads.
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Liftmaster Garage Door Opener: Idler Bolt sheared off
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