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TROUBLESHOOTING & REPAIR
F-6 F-6
RANGER 305D
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 troubleshooting assistance before you proceed. Call
1-888-935-3877.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELD OUTPUT PROBLEMS
The machine will weld, but the
welding arc is “cold”. The engine
runs normally and the auxiliary
power is normal.
1. Make sure the machine is prop-
erly set for the electrode and
process being used. Check
electrode size, mode switch set-
ting, amps or voltage setting. If
gas is used, make sure the cor-
rect type of gas is used and that
the gas flow is set correctly.
2. Make sure that the process
does not demand more power
than the machines able to pro-
duce.
3. If the current seems about right,
but the electrode easily sticks in
the puddle, try increasing the
“ARC CONTROL” setting.
4. Check for loose or faulty con-
nections at the weld output ter-
minals and welding cable con-
nections.
5. Check for adequate connection
between the work cable and the
work piece. The work cable
should be attached to clean
metal, as close to the weld area
as practical. The work clamp
must be in good condition and
have adequate spring tension.
6. The weld cables may be too
long, and/or too small, causing
excessivevoltage drop between
the machine and the arc.
1. The engine RPM may be too
low. Perform the Engine
Throttle Adjustment test.
2. Connect the machine to a resis-
tive load bank. Connect an
accurate ammeter and volt
meter to the output of the
machine, (Meters are often built
into modern load banks.)
Connect a means of measuring
the engine RPM. (See the
Engine Throttle Adjustment
Testfor recommended methods
of measuring engine RPM.
3. Place the mode switch in the
“CC-STICK” position, turn the
output control fully clockwise,
place the idle switch in the
“HIGH IDLE” position. Set the
weld terminals switch to “WELD
TERMINALS ON” position.
4. Make sure that nothing is
plugged into either of the
Amphenol receptacles.
5. Start the machine and allow the
engine to run for about a
minute. Apply a load with the
resistance load bank, and
adjust until the external meters
read about 305 amps and about
29 VDC. If the machine will not
produce this output, apply as
much load as possible.
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual. TROUBLESHOOTING GUIDE