6-NFR DISTRIBUTING VALVE (cont)
CLEANING, INSPECTION, AND REPAIR (cont)
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Do not direct compressed
air against skin. Use goggles or full face shield.
(2) Use compressed air and remove foreign particles from cavities.
(3) Regage graduating valve.
23. Check that piston is not bent. Use a micrometer and measure diameter of two guides on piston. Replace piston if
diameter is greater than 1.733 inches (44.02 mm).
24. Use triple valve oil and lubricate slide valve bushing.
25. Use silicone grease and lubricate O-rings, O-ring grooves in piston valves, and bushings into which piston valves
enter. Use a clean, lint-free cloth and remove excess lubricant.
26. Lubricate rubber check valves by placing them in a box with dry graphite and shaking the box. Remove check
valves. Wipe excess graphite off on a piece of chamois.
Valve assemblies are under a spring load. Use caution during assembly procedures so that no parts fly
out, causing injury to personnel.
27. Install O-ring (54) on adapter (53).
28. Install adapter (53), gasket (52), strainer (51), screen (50), and safety valve (49) in body (2).
29. Install three gaskets (48) and cover (47) and secure with four bolts (46).
30. Assemble large diaphragm piston assembly (37) by the following:
Install O-rings (44) and (43) on piston stem (45).
Install piston spring (42) and piston head (41) on piston stem (45).
Install diaphragm (40) and follower (39) on piston head (41) and secure with nut (38).