DDM Garage Doors Blog -

Now you can wind torsion springs safely without winding bars!

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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Usually, you can find large bi-fold hangar doors at airports or in 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 forty 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 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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The logic board acts as the brain of the opener, telling it when to open and shut the garage door. In this video, we show you how to replace a LiftMaster logic 5 control board.

1. Check to assure you ordered the correct logic board.