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Don Y[_3_]

On 9/1/2015 7:54 PM, wrote:
If the door is properly lubricated, the force to move it up and down should
be fairly small and the pulling out should not occur. Are all the rollers
and the hinges properly lubricated???

I think the problem is the *mass* of the door. The springs are, theoretically,
designed to offset the lifting weight of the door. But, it still has mass
and bulk. When the opener kicks in, the door inevitably "jostles" as it
starts into motion (the opener isn't entirely rigid in its design so acts
like a tuned system). The same applies when the opener abruptly stops
(at end of travel *or* if it detects something in the path)

I think this jostling is what ultimately causes the screws to work their
way loose in the hinges, etc. (the hinges see more of a dynamic load
than the stiffeners!)