TB 5-4220-200-12-1
Table 4-3. TROUBLESHOOTING - UNIT (CONT)
A. AIR DEMAND REGULATOR TROUBLESHOOTING INSTRUCTIONS (CONT)
ITEM
NO.
MALFUNCTION
PROBABLE CAUSE
CORRECTIVE ACTION
6
Air leakage (submerge a. Second stage regulator diaphragm
a. Check and replace if neces-
pressure regulator
sary. (Section V, para 4-14b).
in water to locate
seal between the box top (fig. 4-2)
(5) and the box bottom (fig. 4-2) (11).
source of leak).
b. Tighten rim clamp screw
b. Loose rim clamp (fig. 4-2) (6).
(7), (Section V, para 4-14b).
C. Loose inlet fitting (fig. 4-2) (12).
c. Tighten inlet fitting (12),
(Section V, para 4-14b).
d. inlet fitting O-Ring (fig. 4-2) (13)
d. Clean or replace (Section III,
dirty, damaged, or worn.
e. First stage regulator spring re-
e. Tighten spring retainer
tainer (fig. 4-1) (26).
(26), (Section V, para 4-13b).
f.
First stage regulator plug screws
f. Tighten plug screw.
g. First stage regulator plug screw
g. Clean or replace (Section III,
O-Rings (fig. 4-1) (16) and (19) dirty
or damaged.
h. Hose connectors (fig. 4-2) (25)
h. Tighten hose connections
and (27) loose or damaged.
or replace hose (26).
i.
i.
Clean or replace O-Ring
Hose O-Rings (fig. 4-2) (24) and
(Section III. para 4-7).
(28) dirty, damaged, or worn.
Hose (fig. 4-2) (26) cracked or
j. Replace hose (26).
j.
worn.
7
Water Leakage.
a. Exhaust valve (fig 4-2) (10) dirty,
a. Clean of replace (Section III,
damaged, or worn.
b. Check points listed under "air
leakage," A and B item No. Six.
C. Mouthpiece torn or Loose band
(Mouthpiece).
4-5
