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 TM 9-4120-425-14&P
PRESSURE SWITCHES DIRECT SUPPORT MAINTENANCE REPLACEMENT - Continued
0072-00
INSPECT
Front of Housing
Check wiring and sensing tube for damage.
REMOVAL
1.
Remove two mounting screws (1) and two lockwashers (2) from bracket (3).
2.
Remove four screws (4) and four lockwashers (5) to remove switches (6 and 7) from bracket.
3.
Unhook the electrical leads from the pressure switches. Tag leads for identification at assembly.
4.
Unscrew flare nuts (8) from capillary tube connections (9). Carefully pull capillary tubes (11) through housing
partition (10).
5.
Remove pressure switches (6 and 7).
TEST
1.
Test for continuity across terminals of high pressure switch (6). If no continuity exists, press the reset button and
retest.
2.
If the switch does not indicate continuity, replace.
3.
4.
Check for continuity across terminals.
5.
If continuity does not exist, replace defective switch.
Using nitrogen, pressurize high pressure cutout switch (470-490 psig range/33.04-34.45 kg/cm2 range).
6.
7.
Check for continuity across terminals.
8.
If continuity exists, replace defective pressure switch.
INSTALLATION
1.
Insert ends of capillary tubes (11) through hole in housing partition (10), being careful to avoid kinking tubes.
2.
Connect capillary tube flare nuts (8) to fittings (9).
3.
Install switches (6 and 7) and secure with four screws (4) and four lockwashers (5) to bracket (3). Keep excess
capillary tubing coiled neatly without kinks.
4.
Secure bracket with screws (1) and lockwashers (2).
5.
Connect electrical leads and remove tags.
0072-00-2
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