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Sounds like you have a rod or maybe a bearing bad or possibly a piston starting to seize. Maybe all may be on the way out. Have you checked the oil. Is it at the proper level. These units are not pressure lubricated but splash lubricated. So when the rod goes to the bottom of it's stroke it hits the oil in the crankcase and splashes oil thru out the unit. (simply explained) Also if these units are only used a short time condensate can build in the crankcase. Then you're trying to lubricate with water. If it's binding bad enough to trip the breaker I would say it's to late to try and save. Unless it's still under warranty the only solution is to disassemble and repair,or replace depending on the damage done. Good luck!
Century / Magnetek motors are used on many compressors but usually is an upgrade to have the option to easily switch from 110 to 220. Dewalt, Rol Air, Jenny, Emglo and others are considered high end compressors and come with switch for selecting voltage. One still must change the cord if selecting 220v setting. One thing in common is that 115v motors are never more than 2-3 HP because the amp draw for anything over 2hp is likely higher than 20 amps and would trip most common outlet breakers. You noted that your motor sticker lists 6.5 hp at 15 amp 220v so it could not work with 110v because it would draw over 30 amps and just not be practical. Magnetek motors are very good quality and most always state on sticker 110/220v and show wiring diagram for proper connection. Your compressor was most likely built to be stationary and be hardwired into an outlet/switchbox with heavy duty wiring or special cord to run such a high hp motor. You made a great buy however, because the motor alone lists for several hundered dollars alone. You could replace the motor with a 110v but you would loose the fast performance / recovery of that 6.5 hp motor. Like replacing a v8 engine with a 4 cyl. but expect to pull same load, not likely. Good luck with your purchase, and post again if you have other question.
As the pressure in the compressor increases...so does the demand on the motor. It sounds like the motor is worn out. It could be the bearings or the windings. You could remove the motor and have it re-built(new bearings and windings) at an electrical shop or try to find a replacement on line. If the motor does not have sealed bearings you could try re-packing them with grease or oil. Most motors now have sealed bearings and when they wear out the motor will need them replaced. Check to see if the motor is still under warranty before having it repaired. Sometimes the motor will have a much longer warranty then the rest of the compressor and you may get the manufacturer to send you a new one.
It sounds like it is not getting enough electricity. Try plugging in to an outlet on its own circuit without an extension cord. make sure the circuit is rated for your air compressor. If it is on a circuit with other appliances, refrigerator, lights, ect. try shutting them all off before turning on the air compressor.
yes you can run 220 but it has to be two 120 lines going in from oposite poles in your breaker box go to home depot and a two pole single throw breaker at least 20 amp plug that into your panel and run your cord straight to it from your comp. but you may have a bad motor the breaker will only cost you about $8 so do that and if you still have problem you have a bad motor and that is easy to change but a little more money
I can't blame you for askig, but here's my response. 5 HP is 3750 running watts. or about 35 amps at 110 volts and it would take somewhere around 50 amps to start it provided the motor could even be wired for 110 which I don't believe it can and for that exact reason. I'm sorry, but it's just not practical.
Ok, read the data plate on the motor. Does it have a zero with a line straight through it. That means it's single phase. Also the plate may list two different voltages 110/220ac correct. On the inside of the panel of the box where the cord connects it will have a two diagrams. One marked low voltage, the other high voltage. You want 220ac so follow the high voltage diagram. Since it's single phase the green wire will go to a green screw in the box. The black wire from your cord is positive and the white negitive (actually neutral but shown on diagrams as negitive). The wire coming out of the motor will have numbers on it's casing. Follow the connection points on the diagram. Don't worry if you hook them backwards the motor just won't turn. It won't hurt anything.