PROBLEM AVOIDANCE
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"Driving with the shutter part way up or in the roof is a prime cause of early failure," says Dormon.
The doors are well-crafted items but when the brakes are applied it stresses the cables and bends the top roller shafts. Pretty soon it will begin to stick in the tracks and may lock up altogether.
Shutter seals need to be in good condition, especially on the bottom edge, otherwise cable life is quickly shortened because the door will "tamp" or chatter, even when closed.
As it snaps against the floor the cable whips against the top header section, weakens and eventually breaks at the top.
Inspect the seals regularly, says Dormon. If worn or damaged, change them.
If the shutter movement stiffens the tracking could be dry or coated in muck, grease or oil. Give it a good clean and spray with an oilbased lubricant.
JRI recommends CRC 5-56 or a food-grade spray lubricant for insulated shutters.
Surface rust may form on the balance unit's springs; simply brush it off and spray lightly with lubricant.
Never apply grease, Dorman adds, because it clogs the rollers, making them skid and develop flats. Eventually the shutter and cables start bouncing against the header panel—soon, one or both wires will snap.