ARMY TM 9-6115-644-24
AIR FORCE TO 35C2-3-446-12
MARINE CORPS TM 09249A/09246A-24/2
FIGURE 4-2. Fuel Injection Pump High Idle Speed Adjustment
i.
Start generator set and operate at rated voltage and frequency.
j.
Observing frequency counter, slowly increase operating frequency of generator set by turning governor control
unit FREQ range potentiometer clockwise until frequency counter indicates between 65.94 and 66.06 Hz
(MEP-805A) or between 436 and 444 Hz (MEP-815A). At this point generator set has reached overspeed trip
frequency and generator set should shut down.
NOTE
Perform steps k and 1 if generator set does not shut down within limits noted in step j.
Otherwise, proceed to step m.
k. If generator set has not shutdown at upper limit of frequency noted in step j, proceed as follows:
(1)
Turn FREQ range potentiometer counterclockwise until frequency counter indicates midrange of over-
speed trip frequency [Example: 66 Hz (MEP-805A)].
(2)
Turn OVERSPD control potentiometer on governor control unit counterclockwise until generator set shuts
down.
(3)
Activate OVERSPD RESET switch.
(4)
Repeat steps i and j.
l.
If generator set shuts down prior to reaching lower limit of frequency noted in step j, proceed as follows
(1)
Turn OVERSPD control potentiometer clockwise one turn for each hertz generator set shutdown prior
to lower frequency limit.
(2)
Activate OVERSPD RESET switch.
(3)
Repeat steps i and j.
m. Actuate OVERSPD RESET switch.
n.
Loosen jam nut (1, FIGURE 4-1), set high idle stop screw (2) to position recorded for step h, and tighten jam
nut (1).
4-8
