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Sears garage door opener model 136.53637SRT, I recently

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Sears garage door opener...
Sears garage door opener : model 136.53637SRT,

I recently changed the sprocket and now when I push the button, the chain (with and without door attached) only goes about a foot and comes back to the unit. The sensors are on with green lights, not blinking, no obstacles between them. The large light bulb on the unit does not blink when the chain (door holder) returns to the unit. The green light on the back of the unit does blink. I push it for a few seconds and it will stay solid green for about 15-20 seconds then starts blinking again whether or not I press the button to activate the chain...
Submitted: 8 years ago.Category: Appliance
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Answered in 10 hours by:
6/23/2010
Appliance Technician: Craig, Electrical Technician replied 8 years ago
Craig
Craig, Electrical Technician
Category: Appliance
Satisfied Customers: 4,529
Experience: 33 years experience electrical troubleshooting industrial equipment and control systems.
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Appliance Technician: Craig, Electrical Technician replied 8 years ago
Normally this is the 'Tension Force' adjsutment. Turn the up & down force adjustment a bit CW. If that doesn't do it, we'll check the limits adjustment. If it returns like that it's usually a force adjustment
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