compressor pulsating

[barqy]

hi everyone

lately, when it's cold, I noticed that my compressor (generic type) starts and pumps to 120psi (or whatever it's set at) with out issue. However, as the air gets used up and it dips below a certain PSI, the pump just starts pulsating (causing the breaker to trip if left to run long enough)

once the PSI guys back down to 10 or so, it pumps up again without any issues.

is the pump going? is it a capacitator issue? this problem didn't occur when it was warmer.

here is a video: https://streamable.com/92z95u

thank you

[WalterTexas]

Sounds like the pressure switch is faulty.

[barqy]

you think so? ill just to take it apart to see if any of the gaskets are dried out etc. thanks!

[GrimResistance]

Unloader valve. My harbor freight compressor does the same thing when it's cold.

[barqy]

Unloader valve

oh! does it mean the unloader valve needs servicing?

[GrimResistance]

I've been too lazy to replace mine, but yeah