Figure 4-5. Pilot-operated pressure switch unloader valve.
(6) Inspect all parts for wear, pock marks, dirt, or other signs of damage.
Clean or replace as required.
(7) Reassemble the unloader valve by inserting the valve seat pin assembly
strainer and the inlet tee into the valve body. Install the muffler.
When installing the pilot-operated pressure switch, be sure to position the
lock washer and the mounting nut on each side of the pressure switch
Remove power from the compressor when working inside the pressure
Adjust the pilot-operated pressure switch unloader valve as follows.
(a) Remove the pressure switch cover.
(b) Loosen the lock nut located inside the pressure switch in the upper
(c) Turn the adjusting screw counterclockwise until it is free of tension
from the opposing pressure switch tab.