Gate Opener Problems

I have a gate opener that has blown out three motor start capacitors (the original, plus two replacements). I have replaced it one additional time, but assume something else must be wrong. I have greased the rollers and the movement of the gate is very easy (i.e. should not stress the motor). However, after installing the new capacitor and opening / closing the gate once (two traversals) the start capacitor is very hot. It seems to only be a matter of time before it blows again. I had the electric motor rebuilt when it blew the first time, but I am wondering if they just replaced the capacitor and call it good. Is there anything I can do to find the root cause of the problem? Any help would be greatly appreciated.
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Check the voltage rating of the capacitor and see if it is atleast as high as the voltage you are using.
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For openers, make sure every connection point, from beginning to end, is clean and tight.
Unc
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Check the line/circuit feeding the motor. My pool pump did something similar and there was a short to the metal conduit the wires were pulled in. WAG
Only other thing I can think of is the gear box that the motor is connected to.
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