Question about Campbell Hausfeld 26 - Gallon Air Compressor

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I have a CH 5.5hp, 26 gallon 150psi max air compressor that runs constantly even after passing desired psi with a max psi of 100. However, even after 100psi the motor keeps running with no increase of psi. The seems to be no obvious leads anywhere...

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When your compressor pressure reaches the cut out level, and the compressor doesn't stop, that means that electricity is still flowing to your electric motor, and it keeps running.

The compressor will then keep running until the pressure relief valve opens, and that should bleed the pressure in system down below a danger level even though, then, your compressor will keep running until something fails.

If the compressor won't shut off at the cut out pressure, it's 99% sure that your cut out pressure points in the switch are staying closed allowing power to flow to the compressor motor, and the simplest thing to do is to replace the pressure switch.
You could try this... but it will be for short duration and happen again.
IF contacts are stuck, these contacts are not real good with high voltage.Disconnect the power and manually pull the contacts apart if they go right back together then your air adjustment need to be readjusted, if they stay apart check the contacts for burned spots. You can sand them to clean them up but this will happen again over time. Bigger compressors use magnetic starters which use low voltage to the regulator and the Magnetic starter controls the high voltage.

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Posted on Jul 30, 2010

  • lakegal76 Jul 31, 2010

    THank you for your response, however, I'm still a bit perplexed.

    If it is these contacts staying open, why does the psi not get any higher than 100 psi?

    A couple of times you said even if I make the effort to "fix" the problem, it will more than likely return. In each case, why do you think this?

    If you were me, tell me exactly what you would do...step by step so I may have the best chance of success.

    Thank You!

  • dennis bullard Jul 31, 2010

    The preset safety factor is set to 100PSI The maximum amount of pressure that the tank can reach as determined by the guage of the metal, weld and safety tests
    The safety release valve prevents it from escalating beyond this level of pressure recommendation, even though it continues to run. If it didn't "bleed off the pressure it would eventually split the tank or blow the safety valve to smithereens

    Despite fixing the points by cleaning them the metal has become weakend and will burn or stick easily again, locking the contacts again . The only true method of dealing with it is to CHANGE the contacts, cleaning them is only a temporary measure till new contacts can be fitted.



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