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F-20 F-20
TROUBLESHOOTING & REPAIR
RANGER 300 D AND 300 DLX
OBSERVE SAFETY GUIDELINES
TROUBLESHOOTING GUIDE
DETAILED IN THE BEGINNING OF THIS MANUAL.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
The welding arc is “cold.” The
engine runs normally (3700 RPM
no load). The auxiliary power is
functioning normally.
1. Check for loose or faulty con-
nections at the weld output ter-
minals and welding cable con-
nections.
2. The welding cables may be too
long or coiled, causing an
excessive voltage drop.
1. Check for the correct open cir-
cuit voltage (OCV) at the weld-
ing output terminals. If the cor-
rect voltage is present at the
output terminals, check for
loose connections on the heavy
current carrying leads inside the
Ranger 300 D. See the Wiring
Diagram.
2. If the OCV is low at the welder
output terminals, perform the
Engine Throttle Adjustment
Test.
3. Perform the Output Rectifier
Bridge Test.
4. Check for shorted or grounded
windings in the reactor and also
in the main stator. See the
Wiring Diagram.
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.