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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In most commercial operators sold in the last century, there were two voltages: the incoming line voltage, and the lower secondary voltage from the transformer. This was usually 24-28 volts with alternating current. On rainy days in my early years, this lower voltage would often produce a noticeable shock.…
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Installers and salesmen order sectional door operators to match the operator voltages to the voltages in the buildings. Sometimes salesmen order operators with the wrong voltage, and the operator voltage needs to be changed. This is done by changing the wires at the motor as long as the building voltage was 110 or 220 volts.…
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YES, WE'RE OPEN FOR BUSINESS!Due to the Coronavirus and the Delta varation, we have changed our local order pickup policy at our West Chicago location. To pick up an order you will need to order first. The quickest way to do this is through our online shopping cart. There you can select the local pickup option. Or, you can call 630-293-1337 for assistance and to place your order. When ready, we will call you and your parts will be available for pickup in the front entrance on the north side of the building. Longer items will be picked up on the south side loading dock. Please do not arrive until you have been notified that your order is ready.
COVID / DELTA VARIANT UPDATE! NO MASK, NO SERVICE! When picking up parts please wear a mask. If you don't bring one we'll gladly provide one. Please honor the six foot social distancing rule to protect yourself and our employees. Thank you for your patience and understanding as we all navigate this challenge together. More information is available on our blog titled DDM Adjusts to the COVID-19 Coronavirus. In the same article you will also find documentation and an answer to the question: "Is a garage door repair company a life sustaining business?"
PLEASE NOTE: COVID has interrupted global supply distribution chains resulting in unprecedented delays on incoming door and dock industry products. The result is limited availability of many products, three month delays on incoming shipments, and an inflationary rate of over 50% just this year on many of our products.
PLEASE NOTE: DUE TO COVID-19 SHIPPING TIMES ARE NOT GUARANTEED, EVEN ON NEXT DAY AND SECOND DAY SHIPMENTS. NORMAL TRANSIT TIMES DO NOT APPLY.
