Hobart JET-EX 4 Operation And Maintenance Manual page 77

TROUBLESYMPTOM
AND CONDITION
ENGINE AND CONTROLS
15. Engine
response slow
when going
from idle to
rated speed or
from rated
speed to idle.
16. Engine overheats
17. Engine does
not slow down
to idle with
speed control
switch in IDLE
position.
May 20/89
PROBABLE CAUSE
A. Governor-to-carburetor
linkage either loose,
binding, or out of
adjustment.
B. Ignition timing slow.
C. Engine needs tune-up.
A. Dirt or sludge in coolant.
B. Debris and dirt on
radiator core.
A. Malfunction of governor
to-carburetor throttle
linkage, speed control
switch (S406), or idle
solenoid (L403).
(1) Governor-to-
carburetor
throttle linkage binding.
(2) Speed control
switch (S406)
defective.
TEST, CHECK, AND/OR
REMEDY
A. Check linkage. Adjust and/or
tighten as necessary.
B. Check ignition timing and
adjust in accordance with
Ford Maintenance and Operator's
Manual in Chapter 5.
C. Tune up engine as required.
Refer to Ford Maintenance and
Operator's Manual in Chapter 5.
A. Drain coolant, flush radiator,
and put in clean coolant Refer to
Section 2-2, Para. 6 and to Ford
Maintenance & Operator's Manual
Chapter 5.
B. Clean radiator core carefully.
Refer to Ford Maintenance and
Operator's Manual in Chap. 5.
A. Stop engine by placing ignition
switch in STOP/SHUTDOWN
position. Check and correct
as follows:
(1) Manually check linkage.
If binding, free up the
linkage.
(2) With speed control switch
in IDLE (DOWN) position,
take resistance measure-
ments between switch ter-
minals. Measure for ZERO
resistance between terminals
having red-blue and orange-
yellow wires. Measure for
INFINITY (OPEN) between
terminals wired with brown-red
and red wires, & terminals wired
with black-yellow and
black wires. Replace
switch if any of these
readings are improper
OM-2049
3-1
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