Automatic door parts
Replacement parts for automatic sliding and swing doors: belts, carriages, rollers, sensors, controllers and standby batteries. Because equipment in service has usually passed through several maintenance contracts with parts from multiple sources, identification works from operator brand and generation cross-referenced, rather than from the number on the part.
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Frequently asked questions
How do I identify the right part when the number on it is worn or does not match?
Start from the operator label above the door: brand, generation and serial number. Equipment that has passed through several maintenance contracts may carry parts from multiple sources, so the number printed on a part is not necessarily the original. Photograph the operator label, the part to be replaced and its mounting position for cross-referencing.
What do I need to replace the belt on an automatic sliding door?
You need the tooth pitch, belt width and total length or tooth count. A toothed belt with a different pitch will not mesh with the pulley even at the same width. If the old belt has snapped, measure the length along the belt path on the track or count the teeth on the remaining piece.
When should carriages and rollers be replaced?
Typical signs are noisy, vibrating or jerky travel, rollers worn unevenly or with flat spots, and a leaf that sits lower than it used to. Replace all rollers on one leaf together so the load is shared evenly, and check the track for grooving, since a worn track destroys new rollers quickly.
Can I fit a sensor from another brand?
Yes, if the replacement has the same supply voltage, the same output type (relay contact or solid-state signal) and the same function (activation or presence safety in the swing or slide zone). Pedestrian automatic doors fall under ANSI/BHMA A156.10, which sets requirements for safety detection zones, so verify the detection zone after replacement before returning the door to service.
How often does the standby battery need replacing?
The standby battery lets the door open or close during a power failure, and its capacity falls with age even with little use. A replacement must match the controller's voltage, capacity and connector; test by switching off mains power and running the door through one cycle on battery.
How should the track of an automatic sliding door be cleaned?
Wipe dust and wear debris from the running surface with a dry or slightly damp cloth, and do not grease the track unless the manufacturer requires it, since grease holds dust and marks the rollers. Check that the floor guide is not jammed with debris, a common cause of leaf sway and rubbing. Do this with the operator isolated from power.
What information is needed when ordering automatic door parts?
Provide the operator brand and model, the serial number from the label, the door type (single slide, bi-parting slide or swing), and the leaf dimensions and estimated weight. Include photos of the part to replace and its mounting position, plus quantity. Leaf weight matters for carriages and belts, since their rated loads differ.
An automatic door runs slowly or stops mid-travel: what should be checked first?
Check mechanical causes first: obstructions in the floor guide, seized rollers, or a slack or tooth-worn belt, since the controller usually slows or stops when it meets unusual resistance. Then check whether the sensors are dirty or misaligned, making the door detect a false obstacle. Only replace electrical parts once mechanical causes are ruled out.
