Remove the plastic E-clip and gear at the bottom of the shaft, part number 14 at http://liftmaster.com/pdfdocs/114A1915.PDF
<DIV><FONT face=Arial size=2>I am trying to replace the sprocket on my
Craftsman 1/2 HP GOD model 139.53525SRT. I have removed the 3 screws
from under the chassis in order to lift out the entire sprocket assembly.
However, I am unable to lift out the sprocket assembly because there is a
'collar' just under the worm gear bracket that prevents the 'limit gear'
portion of the sprocket from passing through the worm gear bracket. This
'collar' is not shown in any of the diagrams accompanying the replacement
sprocket and worm drive. The collar is made of a soft metal, easily marred by
a tool. Anyone know what the purpose of this 'collar' is and how to remove it?
I'm fine with all the other instructions - but I am stumped and cannot
proceed. Please see a photo for clarification at </FONT></DIV>
<DIV><FONT face=Arial size=2>1.The 'red' arrow points out the collar I am
having difficulty with. </FONT></DIV>
<DIV><FONT face=Arial size=2>2.The 'green' arrow points out another collar
that is part of the bracket that the sprocket is inserted through. When
I lift up to remove the sprocket - the 'drive gear' cannot pass through the
collar (indicated by the red arrow) because the 'drive gear' is larger in
diameter than the collar.</FONT></DIV>
<DIV><FONT face=Arial size=2>3.The 'yellow arrow points to the shaft of the