An automatic gate gets used more than almost anything else on a property. Two trips out and two back make four cycles a day, every day, on equipment that lives permanently outdoors in one of the harshest climates in the country.
Most gate problems we’re called out to fix were avoidable. Not all — motors do eventually fail — but the majority come down to dust in a track, a battery nobody tested, or a wire a rodent got to months earlier.
A note on scope before we start: we work on the automation side of gates — operators, access control, safety devices and wiring. We don’t build or install the gate structure itself, so this checklist covers the equipment that makes the gate move, not the ironwork.
Why gate operators fail faster here
Heat. An operator bolted to a south-facing pillar in July is sitting in direct sun with no shade and no airflow. Internal temperatures climb well beyond the conditions the manufacturer designed for. Lubricant thins, capacitors and control boards age quickly, and motors that would run for fifteen years elsewhere don’t.
Dust. Sliding gates are the worst affected. Sand and grit collect in the track and the chain, and the drive mechanism grinds through it every cycle. On swing gates the same dust works into the arm joints and hinge pivots.
Monsoon. Wind-driven rain finds its way into housings that were sealed years ago and haven’t been checked since. Underground operators are especially vulnerable if the drainage around the housing has silted up. Power outages create another problem, which we’ll cover below.
Rodents. Pack rats nest in warm operator enclosures and chew low-voltage wiring. If a gate has started behaving unpredictably — intermittent response, safety device faults, a keypad that works sometimes — a chewed wire is high on the list of suspects.
Monthly: watch a cycle
Stand where you can see the whole gate and run it open and closed once.
- Does it move at a steady speed, or does it hesitate, surge, or slow in one spot?
- Any new noise — grinding, squealing, a knock at a particular point?
- Does it stop cleanly at both ends, or does it bounce, drift, or push against the stop?
- Does the safety reverse work? Break the photo-eye beam while the gate is closing. It should stop and reverse immediately.
That last one is not optional. A gate operator can generate enough force to injure someone, and the safety devices are the only protection between the equipment and a person or vehicle in its path.
Quarterly: clear the debris
Fifteen minutes, four times a year.
Sliding gates
Clean the full length of the track. Sweep out sand and grit, remove stones, and clear anything caught in the chain or rack. A blocked track is the single most common cause of premature wear we see on sliding systems.
Check the guide rollers at the top of the gate for play and for debris packed into them.
Swing gates
Clear leaves and dirt from around the hinge points and the base of each post. Wipe down the operator arm and check that the arm’s pivot points move freely and aren’t packed with dust.
Both
Wipe the photo-eye lenses. Dust on a lens causes false triggers and is a two-second fix that saves a service call.
Open the operator housing and look inside. Droppings, nesting material, chewed insulation — deal with it now rather than after the wire is severed.
Twice a year: the fuller check
Spring and fall are the natural times; before the heat and after the monsoon.
Lubricate
Chain and rack mechanisms on sliding gates need lubrication. Swing gate arm joints and hinge pivots need it too. Use a lubricant intended for outdoor mechanical equipment. As with garage doors, don’t use WD-40 as a lubricant — it displaces what’s already there and leaves the part drier than it was.
Test the battery backup
This is the one most people skip, and it’s the one that matters at three in the morning during a storm.
Cut the mains power to the operator and cycle the gate on battery. It should open and close normally. If it’s slow, struggles, or won’t complete a cycle, the battery has lost capacity.
Batteries fade faster in this heat than the rated life suggests. Plan on replacing them every two to three years rather than waiting for a failure, and test twice a year so you catch a weak battery before an outage.
If your gate has no battery backup at all, it’s worth adding. We cover why in more detail in our guide to gate openers and access control.
Inspect the wiring
Follow the visible low-voltage runs — to the photo eyes, the keypad, the intercom, the exit loop. You’re looking for chewed insulation, UV-cracked casing, and connections that have corroded or worked loose.
Check the access control
Test every method you have: each remote, the keypad, the phone app, the intercom. Replace remote batteries as a matter of routine. Delete codes for contractors or guests who no longer need them — a temporary code left active for three years isn’t temporary.
Annually: the professional inspection
Once a year, the entire system should be professionally inspected. What we cover:
- Operator force settings measured and adjusted — this is what determines whether the gate reverses correctly on an obstruction
- Travel limits reset so the gate stops cleanly at both ends
- Safety devices tested to manufacturer specifications — photo eyes, edge sensors, loop detectors
- Full inspection of the drive mechanism for wear
- Battery backup capacity tested under load
- All wiring and terminations checked
- Hinges, rollers and guides checked for wear and alignment
- Access control tested and firmware updated where applicable
If you’ve bought a house with an existing gate and don’t know when it was last serviced, start here. We see plenty of systems that haven’t been touched since installation, and the fault list is usually longer than the owner expects.
Signs you shouldn't wait on
Call sooner rather than at the next scheduled check if:
- The gate is slower than it used to be, or the motor runs noticeably longer
- It reverses for no obvious reason, or fails to reverse when something is in the way
- It stops partway and needs a second command to finish
- The operator is hot to the touch after a single cycle
- A remote or keypad works intermittently
- You can hear a change in the motor — it’s laboring, running at a higher pitch, or clicking without moving.
Intermittent faults have a habit of becoming permanent ones at the least convenient moment, and they’re usually cheaper to fix while they’re still intermittent.
What to leave to a technician
Force and limit settings. These govern whether the gate stops when it meets an obstruction. Adjusting them without knowing how to verify the result can disable the protection entirely.
Anything mains-voltage. Operator power feeds are not a DIY job.
Spring-loaded and counterbalanced components. Some operator designs use them, and they store real energy.
Underground operator housings. Pulling one apart to clear water or debris is more involved than it looks and easy to reassemble incorrectly.
Booking a gate service
Call 602-495-1555 to book a gate inspection. We service automatic gate systems across the Phoenix metro, with technicians running from our Tempe and Gilbert offices and same-day availability 7 days a week.
We cover the full service area — Phoenix, Scottsdale, Mesa, Chandler, Gilbert, Tempe, Glendale, Peoria, Surprise and Goodyear.