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TROUBLESHOOTING & REPAIR
F-25 F-25
RANGER 250
WARNING
FLASHING AND 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
electrical 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 the maxi-
mum engine speed (3700 RPM). This information will aid the technician in determining if
the generator field is operating properly. Tests can be conducted with the engine stopped
(static test) and running (dynamic test). These procedures also allow you to test the oil
pressure switch for proper functioning.
MATERIALS NEEDED
3/8" Wrench or socket wrench
9/16" Wrench
Test pins
Jumper lead
Volt/Ohmmeter
Wiring Diagram
This procedure should take approximately 35 minutes to perform.