Instructions For Replacing Motor Drive Chain Sprocket
The sprocket on top of the motor housing of a 1/3 HP Access Master(made by Chamberlain) has broken off. I have removed the motor housing and can see that the sprocket assembly interlocks with the worm gear as well as the up/down limit switches and contacts. I can also see that there are three sheet metal screws running from inside the housing assembly up through the top which serve to mount the sprocket assembly to the housing. My question is how much of the worm gear and up/down limit switch assemblies will I have to remove? It also appears that the sprocket shaft has one or two spacers that might be held in place by set screws? Any help is much appreciated.