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

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7. Checking Connections and Leads
ALWAYS make a check of connections and leads to a component suspected of being faulty. With the ex-
ception 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 Governor Trouble Shooting
The following facts concerning the operation of the electric 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 two sources of power to operate normally.
(1) 12-V DC input power
(from engine electrical system)
(2) 4-V AC input power (from magnetic pickup)
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. The actuator will “surge” under the following conditions:
(1) “Stability” or “gain” adjustment set too “high”
(2) Throttle linkage binding
9. Engine Trouble Shooting Procedures
A. General
The following engine trouble shooting procedures were taken from John Deere Diesel Handbook. Certain
abnormal conditions which may interfere with satisfactory engine operation, together with methods of de-
termining the cause of such conditions, are covered in the Trouble Shooting Chart.
The ability of the engine to start and operate properly depends primarily on two things:
(1) The presence of an adequate supply of air, compressed to a sufficiently high compression pres-
sure.
(2) The injection of the proper amount of fuel at the right time.
Lack of power, uneven running, excessive vibration, stalling, and hard starting may be caused by low com-
pression, faulty injection in one or more cylinders, or lack of sufficient air. Refer to Perkins Diesel Handbook
for trouble shooting and repair procedures.
10.Illustrations
Illustrations, Figures 1 through 4, are referred to throughout the Trouble Shooting Chart.
OM-2029
September 30/89 Revised 3-1
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