Hobart JET-EX 4 Operation And Maintenance Manual page 73

TROUBLESYMPTOM
AND CONDITION
ENGINE AND CONTROLS
8. Engine will not
run at rated
speed (2600 RPM)
Cont'd.
9. Engine surges
at no load.
May 20/89
PROBABLE CAUSE
A. Speed control switch
(S406) defective.
B. Carburetor throttle
linkage improperly
adjusted.
C. Governor improperly
adjusted.
A. Governor improperly
adjusted.
B. Binding in governor-to-
carburetor linkage.
TEST, CHECK, AND/OR
REMEDY
A. If engine will not go from
idle to rated speed when speed
control switch (13, Fig. 2)
is in RATED RPM position, turn
off engine and take resistance
measurements at speed control
switch terminals with switch
in the RATED SPEED position.
Measure for about 15 ohms
between terminals having
red-blue and orange-yellow
wires. Zero resistance should
be measured between terminals
having brown-red and red
wires. Replace speed control
switch if any of these
measurements are improper.
B. Check throttle linkage and
make certain the governor can
actuate the carburetor
throttle valve to "wide open"
position. Adjust and free
linkage as required. Refer to
Section 2-3, Para. 2, A, (9),
and Para. 3.
C. Adjust governor in accordance
with Section 2-3, Para. 3.
A. Adjust governor. See Sect
2-3, Para. 3.
B. Free linkage.
OM-2049
3-1
Page 11