PRESSURE AND VACUUM FILTER SUMPS.

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

10).

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

74. PRESSURE AND VACUUM FILTER SUMPS.

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.

figure 25).

(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

24) as instructed in paragraph 74c.

c. Reassembly and Installation.

(1) Install pipe nipples (15, figure 25) and

76. RELIEF VALVES.

elbows (13 and 14) on sump filter bodies (11)

The relief valves (12, 13, 14, 17, 18, and 19,

and install bodies,

figure 24) are all replaced in a similar manner,

(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,

75. PRESSURE AND VACUUM CHECK VALVES.

figure 24) as instructed in paragraph 74.

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.

figure 24) as instructed in paragraph 74a.