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 TM 9-4120-430-14
0055 00
INSPECT
Front of Housing
Check wiring and sensing tube for damage.
REMOVAL
1.
Remove two screws (1) and lockwashers (2) to remove high pressure cutout switch (4) from bracket (3).
See figure 1.
2.
Remove two screws (5) and lockwashers (6) to securing low pressure cutout switch (7) to interior housing bulkhead.
3.
Unhook the electrical leads from the pressure switches. Tag leads for identification at assembly.
4.
Remove grommet (8) from housing partition (9).
5.
Unscrew flare nuts (10) from capillary tube connections (11). Carefully pull capillary tubes (11) through housing
partition (9).
6.
Remove pressure switches (4 and 7).
TEST
1.
Test for continuity across terminals of high pressure switch (4). If no continuity exists, replace the defective switch.
Using nitrogen, pressurize low pressure cutout switch (7) (15-20 psig range/1.05-1.40 kg/cm2 range).
2.
3.
Check for continuity across terminals.
4.
If continuity does not exist, replace defective switch.
Using nitrogen, pressurize high pressure cutout switch (4) (470-490 psig range/33.04-34.45 kg/cm2 range).
5.
6.
Check for continuity across terminals.
7.
If continuity exits, replace defective pressure switch.
INSTALLATION
1.
Insert ends of capillary tubes (12) through hole in housing partition (9), being careful to avoid kinking tubes.
2.
Connect capillary tube flare nuts (10) to fittings (11).
3.
Install grommet (8) into housing partition (9).
4.
Position low pressure switch (7) into unit housing and secure to interior bulkhead with two lockwashers (6) and
screws (5). Keep excess capillary tubing coiled neatly without kinks.
5.
Position high pressure switch (4) into unit housing and secure to bracket (3) with two lockwashers (2) and screws
(1). Keep excess capillary tubing coiled neatly without kinks.
0055 00-2
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