ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
If frequency adjustment range is not correct, adjust frequency, paragraph 2-89-4.
g.
If adjustment is correct, shut down generator set.
h.
Install left fan guard (4, Figure 2-20) with bolts (2) and washers (3).
i.
Shut left side engine access door.
2-89-4. Adjustment
a.
Shut down generator set.
b.
Open left side engine access door and remove control cable wedge (2, Figure 2-24) from governor speed lever
(3).
c.
d.
e.
f.
g.
h.
i.
j.
k.
Loosen jam nuts on both speed adjust bolts on governor control and turn bolts counterclockwise until they do
not touch speed lever (3).
Adjust frequency control adjust cable (6) with nuts (4) and (7) and connect cable to speed lever (3) so that lever
is positioned approximately mid-range.
Start generator set. Using frequency adjust control, adjust frequency to 65 Hz (420 Hz for MEP-812A).
Turn high speed adjust bolt on governor control until it contacts speed lever (3) and tighten jam nut
Using frequency adjust control, adjust frequency to 58 Hz (388 Hz for MEP-812A)
Turn low speed adjust bolt on governor control until it contacts speed lever (3) and tighten jam nut
Using frequency adjust control, cycle generator set frequency from minimum to maximum and back to mini-
mum to verify settings.
Readjust high or low speed adjust bolts on governor control as needed to obtain required frequency adjustment
range.
Shut down generator set and close left side engine access door
2-90. LOW OIL PRESSURE SWITCH.
NOTE
Prior to performing this test, refer to TM9-2815-252-24 and verify engine has good oil
pressure.
2-90-1. Testing.
a.
Shut down generator set.
b.
Open left side engine access door.
C.
Tag and disconnect electrical leads from low oil pressure switch (1, Figure 2-25)
d.
Set multimeter for ohms and connect across switch connector pins C and NO. Multimeter shall indicate open
circuit.
e.
Connect multimeter across switch connector pins C and NC. Multimeter shall indicate continuity.
2-124 Change 2
