Hobart 9OC24S Operation Manual page 220

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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 538114
C. Check Connections and Leads
ALWAYS make a check of connections and leads to a component suspected of being
faulty. With the exception of a few instances, we will assume that connections and
wiring have always been checked first and that power has not been lost as a result
of defective wiring or connections.
8. Electric-Hydraulic Governor Trouble Shooting
The following facts concerning the operation of the electric-hydraulic governor may be
helpful in understanding the system and in determining which unit in the system is faulty
in case of troubles.
A. The system requires three sources of power to operate normally.
(1) 12-V DC input power (from engine electrical system)
(2) 4-V to 6-V AC input power (from magnetic pickup)
(3) 20 psi, or more, oil pressure (from engine fuel oil system)
NOTE: Low oil pressure wil I result in sluggish actuator operation.
B. Assuming other conditions are normal, the actuator will go to, or remain in, IDLE
position under the following conditions.
(1) No 12-V DC power
(2) ,No voltage from control box to actuator
C. Also assuming other conditions are normal,
the actuator will go to FULL THROTTLE
position under the following condition :
(1) No signal (AC power) from the magnetic pickup to the control box
D. The actuator will "surge"under the following, conditions:
(1) "Rate" or "gain" adjustment set too "high"
(2) Actuator linkage to throttle body valve loose
(3) Throttle linkage binding
(4) Low oil pressure at actuator
(5) Dirty actuator
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act 30/73
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