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OM-2031
TROUBLE, SYMPTOM
AND CONDITION
ENGINE AND CONTROLS (CONTINUED)
7. Engine will not
come "up" to gov-
erned speed in GEN
mode. (Continued)
8. Engine goes to
overspeed when con-
trol switch (18,
Fig. 2) is in GEN
3-1
Page 14
PROBABLE CAUSE
E. Defective control
unit
A. Governed speed con-
trol adjustment set
too high (see 2-3,
Fig. 6)
B. Defective linkage or
actuator
C. Defective control
unit
Trouble Shooting Chart (Sheet 6 of 20)
Figure 5
TEST, CHECK, AND/OR
REMEDY
E. Connect a DC voltmeter to
the leads from the control
unit to the actuator. Start
the engine and manually
control speed. At speeds
below governed speed the
voltmeter should indicate
within two (2) volts of the
system voltage. If voltage
is at near zero, turn speed
adjusting screw several
turns clockwise to be sure
speed setting is not too low
because of tampering. If
voltage remains low or at
zero, replace control unit.
Refer to Woodward Handbook
for control unit bench tests
and adjustments.
A. Turn speed control adjusting
screw fully counterclock-
wise. Start engine. Place
control switch (18, Fig. 2)
position. in GEN position. If
engine speed is now well below
governed speed, turn adjusting
screw clockwise until cor-
rect speed (2000 RPM, 400-
Hz). If engine still goes
to overspeed, proceed to
Step B.
B. Check governor linkage and
actuator for sticking or
binding in full-speed posi-
tion. Repair as required.
C. Replace control unit. Check
unit in accordance with
August 5/89 Revised
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