“No woman ever conceived a child, no mare a foal, without Him. But once, and for a special purpose, He dispensed with that long line which is His instrument: once His life-giving finger touched a woman without passing through the ages of interlocked events.…
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At DDM, we run at least three tests to ensure the quality of our springs.
One of the tests is cycle life. We’ve found that some of the imports are lasting 30-50% longer. …
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Here are the new torsion spring instructions for printing for personal use. Please remember these are copyrighted.
Enjoy!
Dan
Limit switches are used to keep the garage door opener from trying to open a garage door that is already open, or trying to close a door that is already closed. Throughout the history of garage doors, engineers have come up with a wide variety of limit switch designs.…
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Full Time Customer Service Position with Benefits
For forty years, DDM has provided top-quality garage door and dock components for DIY residential as well as commercial B2B applications. We have a huge inventory of parts for same or next-day shipping along with quick delivery of garage doors.…
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The old Allister and Allstar openers use two black sprockets. The one above the motorhead moves to activate the limit switches as the limit dogs reach their shut-off points.
The one above the garage door acts as an idler.…
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An operator counter tracks door cycles: one opening plus one closing equals one cycle. To track the usage of a garage door, users often install counters on the operators.
One of the more common reasons to track door cycles is to schedule maintenance before the door or the operator needs repairs.…
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Sometimes, replacement v-belts on garage door operators are a different length than the original belt. In this video, we demonstrate how to adjust a LiftMaster motor so that the belt fits properly, even if it is a different length.
In this video, we demonstrate how to replace v-belts on LiftMaster operators.
For safety, unplug the power to the operator. Wedge a large screwdriver between the belt and the pulley.…
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One of the more common LiftMaster operators is the jackshaft operator. The operator transfers energy as torque power from the motor to the counterbalance shaft in order to open a sectional overhead door. When the counterbalance shaft turns, it opens or closes the door.…
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Huge inventory of torsion springs for same or next day shipping! Here you will find all you need in the most common sizes of 1 3/4," 2," 2 1/4," and 2 5/8" inside diameter springs. Larger 3 3/4" and 6" inside diameter commercial and industrial springs may require a day or two to ship. You'll also find TorqueMaster Springs, Extension Springs, Self-Storage door springs, steel rolling door springs and springs for one piece single panel doors.
Shelves packed with every part you need to fix your doors.
Please note. Shipping times and costs have changed. Normal transit times are currently not guaranteed, even on next day and second day shipments. Shipping prices on items over eight feet have more than tripled.
