TM 55-4920-231-14
c. Installation.
(2) Remove tube assembly (5, figure 25)
(1) Place assembled chassis (figure 24) in
and check valves (16 and 17).
position in tester case (29, figure 22) and secure
(3) Remove elbow (18) and vacuum check
with the six screws (27).
valve (17).
(2) Solder leads on fuseholder (12) and
b. Disassembly.
light base (24 ) as previously identified (figure
(1) The check valves (16 and 17, figure
25) are disassembled in similar manner.
(3) Place power switch (9) in position on
NOTE
tester case (29) and secure with mounting nut
The pressure check valve has a retainer for
(8).
O-ring (4, figure 26) and does not have O-ring
(4) Connect all hose assemblies (paragraph
(2).
63) to the components that are mounted on the
(2) Disassemble in sequence of index num-
chassis.
bers are shown in figure 26.
(5) Position wiring harness (4, figure 25)
c. Cleaning and inspection.
on tester case and secure with screws (3), lock-
(1) Clean the parts, except the O-rings,
washers (2), and nuts (1).
with cleaning solvent, Federal Specification P-
D-680 or equivalent, and dry thoroughly with a
clean, lint-free cloth or clean, dry, compressed
Remove and disassemble the pressure and
air.
vacuum filter sumps (10, and 16, figure 24) for
(2) Inspect parts for cracks, breaks, dam-
cleaning and repair, as follows:
age, deterioration, and damaged threads.
a. Removal and Disassembly.
(3) Replace the valve if any parts are de-
(1) Remove tube asesmblies (5 and 6,
fective.
(4) Replace O-rings if damaged.
(2) Remove clamp (7), bowl (8), gasket
d. Reassembly.
(9), and filter (10) from filter sump bodies
(1) The check valves (16 and 17, figure
(11).
25) are reassembled in a similar manner.
(3) Remove sump bodies (11) and remove
(2) Reassemble valves in the reverse se-
elbows (13 and 14) and pipe nipples (15) from
quence of the index numbers as shown in figure
filter sump bodies.
26.
b. Cleaning, Inspection, and Repair.
e. Installation.
(1) Clean parts except the gaskets, with
(1) Install vacuum check valve (17, figure
cleaning solvent, Federal Specification P-D680
25) on pump and install elbow (18) on check
or equivalent, and dry with a clean, lint-free
valve (17).
cloth or clean, dry, compressed air.
(2) Install pressure check valve (16) on
(2) Inspect parts for cracks, breaks, deteri-
reservoir (36) and tube assembly (5) on check
oration, and damaged threads,
valve and elbow (13).
(S) Repair or replace defective parts.
(3) Install vacuum filter sump (16, figure
c. Reassembly and Installation.
(1) Install pipe nipples (15, figure 25) and
elbows (13 and 14) on sump filter bodies (11)
The relief valves (12, 13, 14, 17, 18, and 19,
and install bodies,
(2) Install filter (10), place gasket (9)
a s follows.
.
and bowl (8) in position on filter sump body
a. Removal.
(11), and secure with clamp (7),
(1) Remove chassis assembly (figure 24)
(3) Install tube assemblies (5 and 6).
from tester case (paragraph 73a).
(2) Remove pressure filter sump (10,
Remove the pressure and vacuum check valves
(3) Remove tube assembly (6, figure 25)
pipe tees (19 and 20), elbows (14) and pipe
(8 and 5, figure 24) for cleaning (paragraph
52e) and repair as follows:
nipple (15 ) from relief valves.
(4) Remove nuts (21), lockwashers (22)
a. Removal.
and screws (23) securing relief valve (24) to
(1) Remove the vacuum filter sump (16,
chassis (51) and remove valve.
