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OUTPUT PROBLEMS
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
CAUTION
Low weld output and low auxiliary
output.
1. The generator brushes may be
worn. See the Maintenance
Section of this manual or contact
your local Lincoln Electric
Authorized Field Service Facility.
2. The engine RPM may be low.
1. Perform the Rotor Voltage
Test.
2. If the rotor voltage is low, the
field capacitor (C1) or bridge
(D2) may be faulty. Test or
replace.
3. Check the rheostat (R1).
Normal resistance is 3.3 ohm.
See the Rheostat Removal
and Replacement Procedure.
4. The rotor may be faulty. Per -
form the Rotor Resistance
Test.
5. The engine RPM may be low.
Perform the Engine Throttle
Adjust ment Test.
6. If engine idle RPM is okay, the
engine may have lost horse-
power and be in need of major
repair.
7. Perform Field Diode Test.
TROUBLESHOOTING AND REPAIR
F-8 F-8
BULLDOG® 140
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