08-01-2006, 06:24 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,669
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the carriage that locks with the door arm travels along the T bar track. the chain then connects to one side of the carriage goes the length of the bar, around a sprocket, then back along the track to the motor sprocket and back into the other end of the carriage. the motor sprocket has an aditional construction which allows rotary limit switches to make and break when the door goes up or down. look to where the door arm mates with the carriage assembly. maybe she broke a spring and latch when she disengaged the door arm.
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