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Liftmaster 5580 - Overunning Limit Stops
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It could be the limits have been damaged or are jammed and are jumping on the screw adjusters. Your could take the cover off the motor to have a look to see if you can see any physical damage. Usually if you press screwdriver into the adjuster to hard it can bend the limits.

Other than that i would suggest contacting Andrew @ Liftmaster Technical Helpline on 01935 823900 to check see if he has a soloution.
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RE: Liftmaster 5580 - Overunning Limit Stops - by Mark - 22-12-2011, 11:06 AM

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