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I have a model 921.152100 craftsman air compressor. The top cover for the wiring (power cord etc) has vanished and I can't remember or find a diagram showing what goes where (which wire to Line, which wire to Motor).Rather than attempt to try all positions and electrocute myself and blow something up, I would rather ask for help and a picture of the diagram or explanation of what to do. Any help is appreciated.Thanks.
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telepathy do not work that hot as in hollywood movies...
you need to provide a model or at least if this is three phase or single phase...
single phase is easy, you have cord with three wires, earth, active and neutral.
you need to open connection box on your compressor and you will find three wires there terminating in junction box, earth connect to earth (usually green or green with yellow stripes), then you have your neutral (usually brown or black) and active (usually blue or red), connect them, do not put cover on yet, plug cable into the power point and switch on/off power. check if motor is rotating in correct direction, if fuses are not blown... if motor is rotating in wrong direction - switch power wire with neutral wire, it just meant that you wired it in reverse...
I have a Husky WL651004AJ which has not been starting up for family members lately and noticed a 50 ft extension cord was being used because of the distance from the power outlet. I moved the air compressor to the power outlet and plugged in the power cord without any other extension cord and the air compressor works fine. The 50 ft cord was too light duty for the power required. (12 ga) and min gage of 10 for the distance of 50 ft without disrupting the power breakers.
If your somewhat of a mechanic/electrician then you can by-pass the pressure switch by hooking the color coded motor wires together with the incoming color coded wires from your power cord in the proper order.
Plug it in and then check to see if it blows the breaker again, if it does then it is your motor that is faulty.
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Your Craftsman model 919.165200, 5hp, 20 gallon compressor was designed to run on 115~120v 15amp. I believe that it was made by Campbell Hausfeld and is of the oilless single cylinder type. If however your compressor is oil lubed and has a motor /drive belt configuration it may be able to convert if there is a spec plate on the motor with alternate wiring diagram. Many high-end compressors like Rol Air, Jenny, Dewalt, etc with motor/belt drive have a switch selectable voltage, however one must still change the power cord when using 220v. Good luck with your projects and post again if your have other question.
Your compressor is most likely made by Campbell Hausfeld. The oily substance could be leaking from the capacitor on the motor. Remove the cover and examine the capacitor for failure. There is a value printed on the cap. (uf) The cap must measure to within 95% of printed value. A failing capacitor will cause the hum that you are experiencing.
Assuming that you are wiring for 115v. Lets start with the ground. The cord that attaches to the wall outlet will have three wires, green, black , and white. Insert the cord thru one of the openings of the pressure switch and attach the green wire to the ground screw. Next look very closely at the contacts and notice that they are arrainged in pairs. There is a small brass bar with two contacts that completes the circuit for each line. Start with L1 and attach white wire from cord, then attach white wire from motor to the screw terminal that small brass bar bridges to (should be T1). Next attach black wire from cord to L2 and black wire from motor to remining screw. Remember that the small brass bar with two contacts is the bridge and simply connects white to white and black to black. Enjoy
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