TM 5-431O-275-14
(6) Close the shut-off valve and adjust the
psig (196.8400 kg per sq cm). Close pressure
pressure regulator to increase inlet and outlet
regulator to decrease the inlet pressure to 2000
pressure to 4500 psig (316.3500 kg per sq cm),
psig (154.6600 kg per sq cm). With the inlet
Apply a soap solution to the back pressure valve
pressure decreased as specified, leakage through
to detect external leakage allowed.
the back pressure valve shall not exceed 0.15 scfm
as indicated by the flowmeter.
Section Il. FILTERING ASSEMBLIES
(4) Lift desiccant cartridge (3) out of the
6-5. General
housing (7) and replace if the blue coloring has
Two separate filtering assemblies are installed in
faded.
the pneumatic system to eliminate moisture and
(5) Remove screw (4) and perforator
oil vapors from the compressed air. They are the
assembly (5) if repair is required.
filter and separator assembly connected directly
to the compressor, and the dehydrator unit in-
stalled near the receiver tank.
KEY to Figure 6-7.
1. Lug screw
2. Cover
a. General. The dehydrator unit is a chemical
3. Desiccant cartridge
4. Screw
drier which supplements the separator and filter
5. Perforator assembly
assembly in removal of moisture from the air. A
6. Spacer
replaceable desiccant cartridge, with a charac-
7. Housing
teristic blue color, absorbs moisture from the air.
8. Gasket
9. Adapter
As the cartridge absorbs moisture, the blue fades
10. Screw
to indicate that a replacement cartridge is
11. Perforator
required.
12. Nut
13. Disc
cartridge (fig. 3-2).
14. Lock nut
15. Performed packing
c. Disassembly.
16. Screw
17. Seal retainer
cap, perforator head (21), cartridge seal retainer
18. Spring
(17), and perforators (11) as an assembly.
19. Preformed packing
(2) Remove and discard preformed packings
20. Backup ring
21. Perforator head
(19 and 15) and backup ring (20).
22. Cap
(3) If cap assembly repair is required,
23. Retaining ring
disassemble as shown in Figure 6-7.
