Hobart 140GT17K, Operation And Maintenance Manual With Illustrated Parts List

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Trouble Shooting Chart (Sheet 6 of 20)
Figure 4
TROUBLE, SYMPTOM TEST, CHECK, AND/OR
AND CONDITION PROBABLE CAUSE REMEDY
ENGINE AND CONTROLS (CONTINUED)
7. Engine will not E. Defective control E. Connect a DC voltmeter to
come “up” to gov- unit the leads from the control
erned speed in GEN unit to the actuator. Start
mode. (Continued) 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.
8. Engine goes to A. Governed speed con- A. Turn speed control adjusting
overspeed when con- trol adjustment set screw fully counterclock-
trol switch (18, too high (see 2-3, wise. Start engine. Place
Fig. 2) is in GEN Fig. 6) 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. Defective linkage or B. Check governor linkage and
actuator actuator for sticking or
binding in full-speed posi-
tion. Repair as required.
C. Defective control C. Replace control unit. Check
unit unit in accordance with
OM-2029
3-1 September 30/89 Revised
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