You air compressor should be run on its own 15 amp electrical circuit. I have provided you with the requirements for the air compressor out of the manual. By what you have stated you have followed all of the requirements. I just have to make sure you are aware of them. Make sure the air compressor has a 120 volts supplied to it when it is trying to start.
If the compressor runs for 5 seconds and then trips the breaker, I would suspect a failure in the starting system. The starting system consists of the start capacitor, the run capacitor, and the start switch. these parts are located on the back end of the motor. When the compressor starts, it can draw double the rated amps. If the start switch does not kick out the start windings, it will continue to pull double the rated amount and trip the housebreaker. If you have an amp clamp and know how to use it, you could check the amp draw of the air compressor. If the amperage does not drop below the amp rating on the compressor, I recommend replacing the capacitor first. This is the only part of the motor that is available. If you have a capacitor checker, you can check the capacitor. The rating will be printed on the side of the capacitor.
I hope this is helpful. If you need further assistance, please provide more details below.
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If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations:
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