Bob Coleman
05-17-2012, 9:42 PM
Having a bit of trouble with my garage door opener and am hoping someone here can help!
I have a chain drive liftmaster, made in 1999 and I couldn't find a model number that matches current numbers. It looks very close to model 1355.
The chain had been sagging for a while, but I figured I would just replace the worn out bearings, etc when everything finally broke. Well, last weekend it broke. The shaft sheered just below the sprocket, so I ordered a replacement kit, and put everything back together this afternoon.
However, when I tried it, the trolley runs a little ways in the down direction, then reverses and runs a foot or so in the up direction and stops. It does this independent of the position of the up or down limits (it will stop if it hits one, but if I move the limits all the way to the extremes, it stops as I described without touching the contacts)
I tried adjusting the up and down force with no change in symptoms.
Does anyone have an idea what might be wrong? I already shelled out for the repair parts, I'd rather not have to buy a new unit!
Is it possible I screwed up the wiring?
Thanks in advance!
I have a chain drive liftmaster, made in 1999 and I couldn't find a model number that matches current numbers. It looks very close to model 1355.
The chain had been sagging for a while, but I figured I would just replace the worn out bearings, etc when everything finally broke. Well, last weekend it broke. The shaft sheered just below the sprocket, so I ordered a replacement kit, and put everything back together this afternoon.
However, when I tried it, the trolley runs a little ways in the down direction, then reverses and runs a foot or so in the up direction and stops. It does this independent of the position of the up or down limits (it will stop if it hits one, but if I move the limits all the way to the extremes, it stops as I described without touching the contacts)
I tried adjusting the up and down force with no change in symptoms.
Does anyone have an idea what might be wrong? I already shelled out for the repair parts, I'd rather not have to buy a new unit!
Is it possible I screwed up the wiring?
Thanks in advance!