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Lincoln Electric selects high quality, heavy-duty industrial
engines for the portable welding machines we offer.
While it is normal to see a small amount of crankcase oil
consumption during initial operation, excessive oil use,
wet stacking (oil or tar like substance at the exhaust
port), or excessive smoke is not normal.
Larger machines with a capacity of 350 amperes and
higher, which are operated at low or no-load conditions
for extended periods of time are especially susceptible to
the conditions described above. To accomplish success-
ful engine break-in, most diesel-powered equipment
needs only to be run at a reasonably heavy load within
the rating of the welder for some period of time during
the engine’s early life. However, if the welder is subject-
ed to extensive light loading, occasional moderate to
heavy loading of the engine may sometimes be neces-
sary. Caution must be observed in correctly loading a
diesel/generator unit.
1. Connect the welder output studs to a suitable resis-
tive load bank. Note that any attempt to short the
output studs by connecting the welding leads togeth-
er, direct shorting of the output studs, or connecting
the output leads to a length of steel will result in cat-
astrophic damage to the generator and voids the
warranty.
2. Set the welder controls for an output current and
voltage within the welder rating and duty cycle. Note
that any attempt to exceed the welder rating or duty
cycle for any period of time will result in catastrophic
damage to the generator and voids the warranty.
3. Periodically shut off the engine and check the
crankcase oil level.
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The NEMA output rating of the SAE-300® is 300 amperes at
32 arc volts on a 60% duty cycle (consult Specifications in
this manual for alternate ratings). Duty cycle is based on a
ten minute period; thus, the welder can be loaded at rated
output for six minutes out of every ten minute period.
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The “Coarse Current Control” is the main Current Adjuster.
The “Fine Current Control” adjusts the current from mini-
mum to maximum. Open circuit voltage is also controlled by
the “Fine Current Control” permitting control of the arc char-
acteristics.
A high open circuit voltage setting provides the soft “butter-
ing” arc with best resistance to pop-outs preferred for most
welding. To get this characteristic, set the “Coarse Current
Control” to the lowest setting that still provides the current
you need and set the “Fine Current Control” near maximum.
When a forceful “digging” arc is required, usually for vertical
and overhead welding, use a higher “Coarse Current
Control” setting and lower open circuit voltage.
Some arc instability may be experienced with EXX10 elec-
trodes when trying to operate with long arc techniques at
settings at the lower end of the open circuit voltage range.
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Start by setting the right-side Fine Current and OCV control
dial to 60, then set the left-side Coarse Current control dial
to the desired current using the dial markings as an approxi-
mate guideline. Arc characteristics and small changes in
output can then be adjusted using the Fine Current and
OCV control dial. A K924-4 Remote Control unit can also be
used as the Fine Control and OCV control dial.
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Start by setting the Wire (CV) / Stick (CC) toggle switch to
the Wire (CV) position. Then set the left-side Coarse
Current control dial to 270. Now move the Voltage
Adjustment dial to the desired voltage. Move the Coarse
Current control to the left for a softer arc and to the right for
a crisper arc.
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