TM 5-4310-386-14
5-23. 4th Stage Valve Head Assembly (Cont).
b. Repair. (figure 5-34)
(1)
Remove 4th stage valve head assembly (para. a. above).
WARNING
Cleanliness is imperative in maintaining and handling diving system components. All tools and
parts must be kept free of oil, grease, rust, or other contamination in accordance with Chapter 4,
Section VII of this manual. Foreign substances within an assembly could result in equipment
failure and possible injury or death to personnel.
Ensure that all air lines and components removed or openings into the air system that provides
breathing air are covered with a plastic bag and secured with a rubber band or taped shut. Small
components should be stored in a plastic bag and sealed. Failure to do so will cause air system
to become contaminated and could result in injury or death to the diver.
(2)
Remove stroke limiter (1) from upper part of valve head (2).
(3)
Remove preformed packing (3), spring (4), and discharge valve plate (5). Discard preformed packing (3).
(4)
Remove upper part of valve head (2) from lower part of valve head (6).
(5)
Remove back-up ring (7), preformed packing (8), discharge valve seat (9), spring plate (10), and suction valve
plate (11). Discard preformed packing (8).
(6)
Remove compression nut (12), compression ring (13), intermediate piece (14), and gasket (15) from upper part
of valve head (2).
(7)
Remove connector (16) and gasket (17) from lower part of valve head (6).
(8)
Clean all components using nonionic detergent cleaner and rinse with clean distilled water.
(9)
Inspect all components for cracks, dents, or other damage.
(10)
Install gasket (17) and connector (16).
(11)
Install gasket (15), intermediate piece (14), compression ring (13), and compression nut (12).
(12)
Turn flywheel on compressor manually until piston protrudes from the cylinder liner.
(13)
Install suction valve plate (11), and spring plate (10) on piston.
(14)
Install in grooves of discharge valve seat (9), preformed packing (8) in bottom, and backup ring (7) in top.
5-104
