4-15. A-1 CHARGING CUTOFF PILOT VALVE (cont)
CLEANING, INSPECTION, AND REPAIR (cont)
Remove choke plug (27) from drycleaning solvent and dry with compressed air. Check that choke plug is
clean and unrestricted.
Lightly coat threads of choke plug (27) with compound consisting of one part powder graphite and two parts
Use pneumatic grease and lubricate O-rings, O-ring grooves in spool valves, and bushings into which spool valves
enter. Use a clean wiping rag and remove excess lubricant.
Valve assemblies are under a spring load. Use caution during assembly procedures so that no
parts fly out, causing injury to personnel.
Install choke plug (27) in body (28).
Assemble two check valve assemblies (22) by installing two springs (25), check valves (24), and retaining rings
(23) in capnuts (26).
Install two check valve assemblies (22) in body (28).
Assemble actuating piston assembly (14) by the following:
Install four O-rings (16) and O-ring (15) on actuating piston (17).
Position felt strainer
(20) on plug (21) and install strainer retainer (19).
Install plug assembly (18) in actuating piston (17) and tighten.
Install actuating piston assembly (14) in body (28). Install gaskets (13) and (12).
Position bottom cover (11) and install two bolts (10).
Assemble cutoff piston assembly (6) by installing four O-rings (8) and O-ring (7) on cutoff valve (9).
Install cutoff piston assembly (6) and gasket (5).
Position gasket (4), spring (3), and top cover (2) and install two b