3-22. CONTROL VALVE ASSEMBLY MAINTENANCE (CONT)
e. Main Relief Valve.
This task covers disassembly, cleaning, inspection, and
reassembly of main relief valve.
TOOLS: No. 1 Common Organizational Maintenance Tool Kit
Fixed open end wrench set
Vise jaw caps
Machinists steel rule
MATERIALS/PARTS: Clean cloths (Appendix C, item 1)
Cleaning solvent P-D-680 (Appendix C, item 2)
Lubricating oil (Appendix C, item 15)
Backup rings (FSCM 10988 PN L32619)
O-ring (FSCM 10988 PN 218-5007)
O-rings, two (FSCM 10988 PN A30843)
O-ring (FSCM 10988 PN 218-5009)
PRELIMINARY PROCEDURE: Control valve assembly removed from loader (page
DISASSEMBLY (SHEET 1 OF 3)
Dry cleaning solvent P-D-680 used to clean
Wear protective goggles and gloves and
parts is toxic and flammable.
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 dont smoke
when using it. Failure to do so could cause serious injury. If you be-
come 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.
Clean all dirt and grease from control valve assembly using cleaning sol-
vent P-D-680. Dry using clean cloths.
Put control valve assembly on clean work bench.
(3) Loosen valve cap (1) and remove valve cap (1) and assembled parts (2 thru
(4) Remove O-ring (2) , backup ring (3), and O-ring (4) from valve cap (1).
Discard O-rings and backup ring.