ARMY TM 9-6115-643-24
AIR FORCE TO 35C2-3-445-22
Section XV. MAINTENANCE OF ENGINE ACCESSORIES
2.104. LOW OIL PRESSURE SWITCH.
2.104.1. Testing.
a. Shut down generator set.
b. Open battery access door and disconnect negative battery cable.
c. Open right side engine access door.
d. Tag and disconnect electrical leads from low oil pressure switch (1, FIGURE 2-31).
e. Set multimeter for ohms and connect across switch connector pins C and NO. Multimeter shall indicate open circuit.
f. Connect multimeter across switch connector pins C and NC. Multimeter shall indicate continuity.
g. Connect negative battery cable.
h. Start the generator set. Place BATTLE SHORT switch in the ON position before releasing MASTER SWITCH from
START position.
i. Connect multimeter to switch connector pins C and NC. Multimeter shall indicate open circuit.
j. Connect multimeter across switch connector pins C and NO. Multimeter shall indicate continuity.
k. Shut down generator set. Return BATTLE SHORT switch to OFF position.
l. Disconnect negative battery cable.
m. If switch fails to meet continuity requirements, replace low oil pressure switch.
n. If replacement is not needed, connect electrical leads to low oil pressure switch and remove tags.
o. Close right side engine access door.
p. Connect negative battery cable and close battery access door.
2.104.2. Removal.
a. Shut down generator set.
b. Open battery access door and disconnect negative battery cable.
c. Open right side engine access door, tag and disconnect low oil pressure switch (1, FIGURE 2-31) electrical leads.
d. Unscrew low oil pressure switch (1) from oil sample valve assembly.
2.104.3. Cleaning and Inspection.
a. Shut down generator set.
b. Remove low oil pressure switch, paragraph 2.104.2.
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