The maximum weight capacity for a LiftMaster 8500 wall-mount garage door opener is up to 850 pounds (or designed to lift standard residential sectional garage doors up to 180 square feet in total area). Because it mounts directly to the torsion bar rather than utilizing an overhead ceiling rail, its lifting power depends heavily on properly balanced torsion springs. If your garage door springs are worn or poorly balanced, even a lightweight door can overload the jackshaft motor. Verification: Disengage the manual release lock and verify that you can lift and balance the garage door smoothly by hand with minimal effort.
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