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TROUBLESHOOTING & REPAIR
F-37 F-37
RANGER 300 D AND 300 DLX
WARNING
ROTOR VOLTAGE TEST
Service and repair should be performed by only Lincoln Electric factory trained personnel.
Unauthorized repairs performed on this equipment may result in danger to the technician or
machine operator and will invalidate your factory warranty. For your safety and to avoid elec-
trical shock, please observe all safety notes and precautions detailed throughout this manual.
If for any reason you do not understand the test procedures or are unable to perform the
test/repairs safely, contact the Lincoln Electric Service Department for electrical trou-
bleshooting assistance before you proceed. Call 1-800-833-9353 (WELD).
TEST DESCRIPTION
This test will determine if the correct DC voltage is being applied to the rotor at maximum
engine speed (3700 RPM - high idle). This information will aid the technician in determining
if the generator field is operating properly.
MATERIALS NEEDED
Volt/Ohmmeter (Multimeter)
5/16” Nut driver
3/8” Nut driver
Wiring Diagram
This procedure requires approximately 20 minutes to perform.