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F-12 F-12
RANGER 300 D AND 300 DLX
TROUBLESHOOTING & REPAIR
OBSERVE SAFETY GUIDELINES TROUBLESHOOTING GUIDE
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 go to high idle when
attempting to weld. Welding out-
put is normal when idler switch is
in “HIGH” position. Automatic idle
function works properly when the
auxiliary power is loaded.
1. Make sure the welding cables
and connections are tight.
2. If welding without a control
cable connected to the DLX
machine, the welding terminals
switch (S7) must be in the
“Always On” position.
1. Check for broken or faulty con-
nections in the sensing leads
#254 and #254 A & B). Make
sure their connections are tight
at the work output terminal and
polarity mode switch. See the
Wiring Diagram.
2. Make sure leads #254 and
#254C are looped three times
through the current sensor on
the control board. See the
Wiring Diagram.