3-21. CHECKS AND ADJUSTMENTS AND FLOWMETER TESTS (CONT)
b. Main Relief Valve Pressure Setting Adjustment (SHEET 1 OF 4). This task cov-
ers adjustment of main relief valve pressure setting. Main relief valve is located
on the control valve assembly.
TOOLS: No. 1 Common Organizational Maintenance Tool Kit
Slip joint pliers
Flat tip screwdriver, 5/16 inch wide tip, six inches long
Combination box and open end wrench set
Pressure gage, zero to 3000 psi range
MATERIALS/PARTS: Clean cloths (Appendix C, item 1)
Cleaning solvent P-D-680 (Appendix C, item 2)
PRELIMINARY PROCEDURES: Front access door unlocked and open.
Dry cleaning solvent P-D-680 used to clean parts is toxic and flammable.
Wear protective goggles and gloves and use only in a well ventilated
area. Avoid contact with skin, eyes and clothes and dont breathe
vapors. Do not use near open flame or excessive heat and don-t smoke
when using it. Failure to do so could cause serious injury. If you
become dizzy while using cleaning solvent, get fresh air and medical
attention immediately. If contact with skin or clothes is made, flush
with large amounts of water.
If contact with eyes is made, wash eyes
with water and get medical aid immediately.
(1) Using clean cloth moistened with
and grease from quick disconnect
(2) Remove cap from quick disconnect
cleaning solvent P-D-680, clean all dirt
coupling (1) at pump outlet.