TM 9-4120-403-14
(9) Check that capillary line is not kinked, mashed or broken. Replace switch if capillary line is damaged.
Test
Use a multimeter to check continuity between terminals 2 and 3 on switch. If there is no continuity, the switch is
properly open. If continuity is found, switch must be replaced.
Replacement
(1) Remove high-pressure cutout switch (S5). (See para 5-18).
(2) Remove low-pressure cutout switch (S6). (See para 5-17).
(3) Tag and remove wire leads from switch (S8).
CAUTION
Take care that sensing bulb capillary line is not kinked and that bulb and capillary are not cut or damaged
during removal.
(4)
Using two wrenches, loosen and disconnect switch capillary tubing flare nut from pressure tap.
(5)
Remove pressure switch and capillary with flare nut from unit.
(6)
See tags and wiring diagram (see fig. 4-43) and connect wire leads. Remove tags.
(7)
Feed tubing to connection area and carefully coil excess capillary tubing and secure in place with tiedown
straps to eliminate vibration.
(8)
Using two wrenches, connect flare nut to pressure tap.
(9)
Secure pressure switch (S8) to enclosure with two screws and lockwashers.
(10)
Seal capillary tubes and grommets in enclosure.
(11)
Secure pressure switch (S6) to enclosure with two screws and lockwashers.
(12)
Secure pressure switch (S5) to enclosure with two screws and lockwashers.
(13)
Install enclosure and switches in unit.
(14)
Align the enclosure, backing plate, gasket, and switch nameplate with unit mounting holes.
5-59