Usually, you can find large bi-fold hangar doors at airports or specialty production shops. We get requests for torsion spring hardware to counterbalance smaller bi-fold doors from time to time.
On bi-fold doors, the top of the door is hinged and secured to the outside top of the opening.…
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Full Time with Benefits
About DDM Garage Doors
For 40 years, DDM has been providing top-quality garage door and dock components for DIY residential and 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 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 door, counters are often installed on the operators.
One of the more common reasons to track door cycles is to schedule maintenance before repairs are needed.…
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Customers sometimes ask if they can substitute a different v-belt for their operator. In this video, we demonstrate how to adjust a LiftMaster motor, so 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 and pry off the belt with a large screwdriver.…
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One of the more common LiftMaster Operators is the jackshaft operator. How does the torque get from the motor to the counterbalance shaft of the sectional overhead type door? In this video, we trace the torque as it moves through the LiftMaster Model J drive components.…
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Engineers at the Chamberlain Group have designed their LiftMaster operators with error codes that reduce the time required to troubleshoot and repair equipment.
Operator product manuals cover a variety of error codes. In our video, we cover the four major problems that occur in an estimated 80% of operator failures.…
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Often when a garage door will open but not close, the cause is a misaligned eye or a broken wire. On residential doors with LiftMaster openers, the quickest test is to check the eyes on both sides. If both lights are on, the eyes should be performing correctly.…
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Huge inventory of parts and torsion springs for same or next day shipping! Here you will find all you need, except for some of the .192 wire springs, in the most common sizes of 1 3/4," 2," 2 1/4," and 2 5/8" inside diameter springs. Please contact us for specialty springs such as TorqueMaster, EZ Set, self-Storage, and steel rolling door springs as many of these have been subject to supply chain shortages. Larger 3 3/4" and 6" inside diameter commercial and industrial springs may require a day or two to ship.
COVID update. No mask, no service! When picking up parts please wear a mask. We'll gladly provide one. Please honor the six foot social distancing rule. Thank you for your patience and understanding.
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.
