TM 5-6115-465-34
TO 35C2-3-446-2
NAVFAC P-8-625-34
TM 06858B/06859D-34
Table 4-4. Governor Malfunction Testing
PROBABLE CAUSE OF
CORRECTIVE ACTION
NON-NORMAL READING
NORMAL VALUE
TERMINAL
s
1. Replace magnetic pickup.
1. Defective magnetic pickup.
1.0 volt AC-RMS minimum
2. Readjust magnetic pickup.
2. Gap too large between magnetic
while cranking,
pickup and gear teeth.
3. Replace wiring harness.
3. Improper or defective wiring
to the magnetic pickup.
1. Connect D.C. power supply;
1. D.C. power not connected or
10.1 .20 volts DC while
K
replace D.C. battery.
low battery voltage.
energized (Internal regu -
2. Replace Control Unit.
2. Frequency trim potentiometer
lated D.C. Supply).
shorted, grounded or miswired.
3. Replace wiring harness.
3. Wiring error.
4. Replace control unit.
4. Defective control unit.
1. Turn Frequency adjust screw
1. Frequency adjust set too low.
Above 5.1 volts D.C. while
L
clockwise.
running. (inverse speed
2. Replace control unit.
2. Defective control unit.
error signal ).
Above 5.1 volts is under
speed signal. Below 5.1
volts is over speed signal.
On speed will indicate a
steady 5.1 volts.
1. Charge D.C. battery; replace
N
1. Battery voltage may be too
8.5 to 9.5 volts D.C. while
D.C. battery.
low while cranking,
cranking. (Proportional
2. Replace Control Unit.
2. Defective Control Unit.
actuator voltage ).
1. Replace Control Unit.
1. Output transistor open (defec-
R
2.5 volts D.C. maximum
tive Control Unit).
while cranking, (Tran-
2. Replace Actuator.
2. Defective Actuator.
sistor voltage).
3. Replace Wiring Harness.
3. Error in wiring to Actuator.
(9) Adjust the control unit gain control to its
(6) Measure the center to center distance between
approximate mid-range position.
the hole in the fuel shutoff lever and the hole in the
actuator lever. Adjust the rod ends on the threaded
(10 ) Adjust the control unit stability control
linkage rod so that the center to center distance of the
to its fully counterclockwise position.
rod ends is the same or slightly longer than that mea-
sured between the fuel shutoff lever and the actuator
potentiometer (pot) (located on the generator set con-
lever. (The 3.75 dimension is only approximate. If the
trol panel ) to mid-range.
linkage is too short, the actuator lever will attain the "no
fuel" position [full clockwise ] before the fuel shutoff
(12) Using a small screwdriver, turn the 22 turn
lever reaches its "no fuel" position; the fuel shutoff lever
frequency adjust potentiometer on the control unit
will never reach "no fuel". If the linkage is too long,
(located on the left side vertical face of the control
the actuator lever will reach its "full fuel" position
unit) counterclockwise (opposite increase arrow) to
[full counterclockwise ] before the fuel shutoff lever
reaches its "full fuel" position; full load will not be
This will give the lowest possible engine governed speed.
reached. ) It may be necessary to readjust the position
NOTE
of the fuel shutoff lever and/or the actuator lever to
accommodate the center to center distance of the rod
Two people will be required to adjust the
ends and to assure complete fuel shutoff and full load
control unit. Ensure that the actuator
operation. Fuel shutoff and actuator lever adjustments
linkage rod and all levers are securely
will be covered under replacement procedures. Tighten
fastened and move freely (without binding)
the nuts on the linkage rod against the rod ends to main-
before opearing the engine. Manually over-
tain proper spacing,
come the actuator until adjustment of the
(7) Return the generator set START-RUN-STOP
control unit will be made with the engine
switch to the STOP position and the BATTLE SHORT
operating in a no-load condition.
switch to the OFF position.
(13) Start the engine, manually operating the fuel
(8) Reconnect the actuator linkage rod end to
shutoff lever.
the engine fuel shutoff lever.
4-40.3
Change 7