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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
Engine and Controls(cont.)
Trouble, Symptom & Condition
Engine will not come "up" to
governed speed in GEN mode.
(Continued)
8. Engine goes to overspeed
when control switch (17, Fig. 1)
is in GEN position.
9. Engine is unsteady (surges)
under load.
Chapter 3-1
Page 16
Probable Cause
d. Defective actuator.
e. Defective control unit.
a. Governed speed control
adjustment set too high
(see 2-3, Fig. 11).
b. Defective linkage or
actuator.
c. Defective control unit.
a. Fault in engine.
b. Governor system faulty or
mis-adjusted.
c. Loose or binding governor
linkage.
d. GAIN and STABILITY
controls improperly
adjusted.
e. Magnetic pickup signal
weak.
Corrective Action
Apply 12-V DC to the two actuator
input leads. Actuator lever should
move immediately to full speed
position. If lever does not move,
replace actuator.
See Woodward Governor manual.
Turn speed control adjusting
screw 22 turns counterclock-
wise. Start engine. Place control
switch (18, Fig. 1) in GEN
position. If engine speed is now
well below governed speed, turn
adjusting screw clockwise until
correct speed (2000 RPM, 400
Hz) is reached. If engine still
goes to overspeed, proceed to
step B.
Check governor linkage and
actuator for sticking or binding in
full-speed position. Repair as
required.
Replace control unit. Check unit
in accordance with Woodward
operating instructions.
Before condemning the governor
system for surging, make certain
the fault is not in the engine.
Make certain all cylinders are
firing properly and air and fuel
supply is proper.
Check and adjust as follows:
Check linkage ball joints and all
connections for looseness or
binding. Be sure linkage will
move from idle speed to full
speed without lost motion or
binding.
Adjust GAIN and STABILITY
controls on control unit in accor-
dance with 2-3; Para. 3, E, (2)
Check and adjust pickup. See
2-3, Para. 3, E, (2).
March 31/94 Revised
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