MASTER RELIEF VALVE (RV1) ADJUSTMENT (Sheet 2 of 2)
Correct pressure is 3800 ± 50 psi (26220 ± 340 kPa).
Using wrench, remove adjusting screw cap (B).
To adjust relief valve pressure, hold adjusting screw (C) with 3/16 inch screw key and
use wrench to loosen jamnut (D). Using 3/16 inch screw key, turn adjusting screw (C)
clockwise to increase pressure or counterclockwise to decrease pressure.
Repeat steps 3 through 9 until pressure gage shows reading of 3800±50 Psi (26220±
Holding adjusting screw (C) with 3/16 inch screw key, use wrench to tighten jamnut
Using wrench, install adjusting screw cap (B).
Remove pressure gage.
Using 1/4 inch screw key, install plug (A).
End of Task