Lincoln Electric IM10047 RED-D-ARC GX300 - Manual (Page 20)

B-4 OPERATION B-4
Operating the starter motor for more than 5 sec-
onds can damage the motor. If the engine fails to
start, release the switch and wait 10 seconds
before operation the starter again. Do NOT push
the START button while the engine is running
because this can damage the ring gear and/or the
starter motor.
------------------------------------------------------------------------
STOPPING
Remove all welding and auxiliary power loads and
allow the engine to run at low idle speed for a few min-
utes to cool the engine.
Stop the engine by placing the RUN-STOP in the
STOP position.
NOTE: A fuel shut off valve is not required on the GX
300 because the fuel tank is mounted below the
engine.
WELDER OPERATION
DUTY CYCLE
Duty Cycle is the percentage of time the load is being
applied in a 10 minute period. For example, a 60%
duty cycle represents 6 minutes of load and 4 minutes
of no load in a 10 minute period.
DC STICK WELDING
The GX 300 can be used with a broad range of DC
stick electrodes.
The MODE switch provides two stick welding settings
as follows:
CONSTANT CURRENT (CC-STICK)
WELDING
The CC-STICK position of the MODE switch is
designed for horizontal and vertical-up welding with all
types of electrodes, especially low hydrogen. The out-
put CONTROL dial adjusts the full output range for
stick welding.
The ARC CONTROL dial sets the short circuit current
(arc-force) during stick welding to adjust for a soft or
crisp arc. Increasing the number from -10(soft) to
+10(crisp) increases the short circuit current and pre-
vents sticking of the electrode to the plate while weld-
ing. This can also increase spatter. It is recommended
that the ARC CONTROL be set to the minimum num-
ber without electrode sticking. Start with the dial set at
0.
DOWNHILL PIPE WELDING
This slope controlled setting is intended for "out-of-
position" and "down hill" pipe welding where the oper-
ator would like to control the current level by changing
the arc length. The output CONTROL dial adjusts the
full output range for pipe welding. The ARC CON-
TROL dial sets the short circuit current (arc-force) dur-
ing stick welding to adjust for a soft or more forceful
digging arc (crisp). Increasing the number from -
10(soft) to +10(crisp) increases the short circuit cur-
rent which results in a more forceful digging arc.
Typically a forceful digging arc is preferred for root
and hot passes. A softer arc is preferred for fill and
cap passes where weld puddle control and deposition
(“stacking” of iron) are key to fast travel speeds. This
can also increase spatter. It is recommended that the
ARC CONTROL be set to the minimum number with-
out electrode sticking. Start with the dial set at 0.
GX 300
CAUTION
Low Idle - No Load
2400 R.P.M
High Idle - No Load
3700 R.P.M
DC Weld Output
240 Amps @ 29 Volts
DC Weld Output
300 Amps @ 29 Volts
Auxiliary Power
9,500 Watts
Kohler CH23S, CH680
Gal./hrs (liters/hr)
.51 (1.9)
.83 (3.2)
1.39 (5.3)
1.53 (5.8)
1.64 (6.2)
Running Time for
12 gallons -(hrs.)
23.5
14.5
8.6
7.8
7.3
Kohler CH730
Gal./hrs (liters/hr)
.43 (1.64)
.99 (3.74)
1.56 (5.91)
1.81 (6.86)
1.85(7.00)
Running Time for
12 gallons -(hrs.)
27.8
12.1
7.7
6.6
6.5
TYPICAL GX 300 FUEL CONSUMPTION