IR 5HP air compressor pump knocking.

[Tri5Nerd]

Originally Posted by RanchFlyer

Tri Five glad to see it going again. Congrats on doing it yourself. As far as a leak at the P Switch. Be sure to check the check valve where the discharge line goes into the tank. The P Switch is supposed to bleed off the air in the compressor pump after the machine shuts off. When the check valve fails, the P switch will bleed air constantly. I have sold many switches to only have people come back complaining that the new one "leaks too".

Good to know but it's leaking continuously, so I took it off and cleaned it up, it was leaking from the diaphram/gasket, so I tighten the 4 screws in the bottom of the P switch and reinstall but ran out of time before I could test it. I'll test it tomorrow to see if that corrected the leak.