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TROUBLESHOOTING & REPAIR
F-11 F-11
RANGER 300 D AND 300 DLX
TROUBLESHOOTING GUIDE OBSERVE SAFETY GUIDELINES
DETAILED IN THE BEGINNING OF THIS MANUAL.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
ENGINE PROBLEMS
Engine will not idle down to low
speed. Machine has normal weld
output and auxiliary power.
1. Make sure the idler switch (S5)
is in the “Auto” position.
2. Make sure there is NOT an
external load on the weld termi-
nals nor the auxiliary power
receptacles.
1. With the idler switch (S5) in the
“Auto” position, no external
load connected to the machine
and the engine running, check
the DC voltage at leads #222J
to #214 located at the idler
solenoid. Also check from
leads #222H to #213. No (zero)
volts is normal. If 12VDC IS
present, the control board may
be faulty. If no voltage is indi-
cated and the solenoid is keep-
ing the engine in a high speed
condition, the idler solenoid
may be faulty. Also check for a
mechanical restriction in the
throttle linkage.