LocationSilver Lake, LA
Reported symptomReversing two feet before close
Owner's guessFailed motor
Actual causeDrifted limit switch
I got a call from a homeowner in Silver Lake last spring. His automatic sliding gate had been reversing about two feet before closing for the past three weeks. He'd already replaced the battery in his remote and figured it was the motor.
When I pulled up, the gate looked fine at first glance. No obvious damage. The motor ran. But I started at the beginning, power supply, control board output, sensor alignment, and worked forward through the system. That's the gate diagnostic sequence, the ordered process we use to find which component caused the failure, and we never skip steps.
The motor wasn't the problem. A limit switch had drifted, the position sensor telling the operator where "closed" was had shifted. The gate was hitting that phantom endpoint and reversing to protect itself. Two other things had contributed: one of the track rollers had developed flat spots from carrying extra load, and the rear post had moved slightly. Post footing stability, the condition of the concrete anchor holding the post, matters more than most people expect on clay soil, and Silver Lake sits on it.
We recalibrated the limit switch, replaced the worn roller, and assessed the post. The post hadn't shifted enough to need full replacement, but we corrected the alignment. The gate closed clean on the first test cycle.
Swapping the motor without the diagnostic would have produced the same symptom inside of a month. That's exactly why we run the full sequence first, every time.
This is the principle of component load sharing: gate hardware doesn't fail in isolation. A strained roller puts extra torque on the operator. A drifting post loads the hinges unevenly. Repair work that ignores these relationships gets repeated.