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Craftsman 33gal.150 psi air compressor:Start on M/T tank not when full. Start & builds up; then drops down to cut in pressure & kicks breaker when starting up.What can I do to fix this problem.
Sounds like you need a higher current circuit. When a motor starts up, there is a higher than normal current draw, usually 2x to 4x the running current. When it starts up against cut in pressure, there is even more resistance and hence more current draw than when starting up against no pressure in the tank. So, your circuit is capable of providing startup current with no presure, but with pressure it is drawing more current and tripping the beaker. Don't just put a higher rated circuit hreaker in unless you want to buern down your house. Get an electrician to measure the starting current of your compressor and wire up a circuit and outlet that will handle that current safely. That said, the advertising for the compressor says it can run on a standard (15 amp) household circuit, so your motor may be drawing excessive current. Either way, an electrician can help you. Another option is to add capacitive start to the compressor, but, again, a good electrician will have the solution.
on Jul 12, 2019
I have a VERY OLD Craftsman Air Compressor. I
I've been working on air compressors for a while now and so far haven't found any that give a specific amount of oil to put in the air pump crank case. They all have one of two methods to get the oil to the proper level. First, and my favorite, is a sight glass at the bottom of the crank case. About the size of a quarter, it lets you see how much oil is in the pump as you add it. Usually they have a red center dot which is where you want the oil level. A little over or under is OK but the sight glass should not be completely full or completely empty, both are hard on the pump and drive motor. Another method is a dip stick usually on the end of the fill hole cap. Only bad thing about these is you have to put in some oil, check the oil level with the dip stick, then add more oil and check it with the dip stick until you get to the full mark. Again, not over and only a little under is where you want the oil level.
on Jul 20, 2018
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