Hobart JET-EX 4 Operation And Maintenance Manual page 72

OM-2049
TROUBLESYMPTOM
AND CONDITION
ENGINE AND CONTROLS
5. Engine runs
roughly, then
stalls.
6. Engine does not
attain normal
idle RPM, or
idles too fast.
7. Engine goes to
overspeed
immediately
when speed con-
trol switch is
placed in
RATED RPM
position.
8. Engine will not
run at rated
speed (2600 RPM)
3-1
Page 10
PROBABLE CAUSE
A. Distributor timing
improperly set.
B. Moisture or damaged
components in
distributor.
A. Idle speed set either
too high or too low.
A. Loose, slipping or
defective drive belt.
B. Improper setting of
engine RPM at governor.
C. Governor defective.
A. Speed control switch
(S406) defective.
TEST, CHECK, AND/OR
REMEDY
A. Check timing. Set timing
according to Ford Maintenance
and Operator's Manual.
B. Check distributor according
to Ford Maintenance and
Operator's Manual. Service
or replace items as necessary.
A. Adjust idle speed to approx-
imately 900-1000 RPM.
A. Inspect belt. Adjust or
replace as required.
B. Set governor for proper engine
RPM.
C. Replace governor. Send old
governor to overhaul.
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.
May 20/89