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TROUBLESHOOTING & REPAIR
F-29 F-29
RANGER 300 D AND 300 DLX
WARNING
ENGINE THROTTLE ADJUSTMENT 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
If the machine output is low or high, this test will determine whether the engine is operating
at the correct speed (RPM) during both HIGH and LOW idle conditions. Directions for adjust-
ing the throttle to the correct RPM are given.
MATERIALS NEEDED
5/16” Nut driver
3/8” Nut driver
10mm Wrench
7/16” Wrench
White or red marking pencil
Strobe-tach, frequency counter, or oscilloscope
This procedure requires approximately 30 minutes to perform.