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B-1
OPERATION
B-1
SAFETY PRECAUTIONS
Operate the welder with the doors closed. Leaving the
doors open changes the designed air flow and can cause
overheating.
GENERAL DESCRIPTION
The Classic
®
300G is a heavy duty, engine driven, DC
arc welding power source, capable of providing constant
current output for stick welding or DC TIG welding. This
welder is wound with all copper coils, rated at 300
amps/32 Volts, and provides other Classic features such
as improved door latches and stainless hinges. With the
addition of the optional K623-1 Wire Feed Module
™
the
Classic 300G will provide constant voltage output for run-
ning the LN-7, LN-23P, or LN-25 wire feeders. The
optional K924-4 Remote Control Kit (field installed) pro-
vides a switch, or K924-5 Remote Control Kits provide a
receptacle and a remote control rheostat for remote fine
current and open circuit voltage adjustment.
The Classic 300G has an electronic Engine Protection
system. In the event of sudden low oil pressure or high
coolant temperature, the engine immediately shuts down.
The Classic 300G has a current range of 40-350 DC
amps with output ratings as follows:
These units are also capable of providing 3 kVA of
115/230 volts of 60 cycle AC auxiliary power.
CLASSIC 300G
Do not attempt to use this equipment until you
have thoroughly read the engine manufacturer’s
manual supplied with your welder. It includes
important safety precautions, detailed engine
starting, operating and maintenance instructions,
and parts lists.
------------------------------------------------------------------------
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and
ground
• Always wear dry insulating gloves.
------------------------------------------------------------------------
ENGINE EXHAUST can kill.
• Use in open, well ventilated areas or
vent exhaust outside.
----------------------------------------------------
MOVING PARTS can injure.
• Do not operate with doors open or
guards off.
• Stop engine before servicing.
• Keep away from moving parts.
------------------------------------------------------------------------
See additional warning information at the
front of this operator’s manual.
WARNING
DO NOT MOUNT OVER COMBUSTIBLE SURFACES.
Where there is a combustible surface directly under
stationary or fixed electrical equipment, the surface
shall be covered with a steel plate at least
.06”(1.6mm) thick, which shall extend not more than
5.90”(150mm) beyond the equipment on all sides.
------------------------------------------------------------------------
The Classic 300G uses the GM 3.0L industrial water-
cooled gasoline engine.
DESIGN FEATURES
Control Panel
Both the engine and the welder controls are located on
one recessed panel at the exciter end of the machine.
The welder controls consist of a five step “Current Range
Selector” switch and a “Fine Current Adjustment” rheo-
stat. The welder is equipped with a “Start” button, an
“Ignition” switch, an “Idler” control switch, and a “Glow
Plug” button for easier cold weather starting.
The control panel also contains an engine temperature
gauge, a battery charging ammeter, an oil pressure
gauge, two three prong grounding type receptacles and
four circuit breakers for auxiliary power.
All Copper Windings - For long life and dependable
operation.
Engine Idler Control - The Classic 300G is equipped
with an electronic automatic engine idle control. It auto-
matically increases and decreases engine speed when
starting and stopping welding or using auxiliary
power. A built-in time delay permits changing electrodes
before the engine slows to its low idle speed. The “Idler”
control switch on the panel locks the idler in high idle
position when desired.
Auxiliary Power - 3.0 kVA of nominal 115/230V, 60Hz,
AC. Output voltage is maintained within ± 10% at all
loads up to rated capacity. (See Optional Features for
Power Plug Kit.)
Welder Enclosure - The complete welder is rubber
mounted on a rugged steel “C” channel base.
The output terminals are placed at the side of the
machines so that they are protected by the door. The
output terminals are labeled (+) and (-).
Cranking System - A 12 volt electric starter is standard.
250A @ 30V
300A @ 32V
100%
60%
RATED OUTPUT DUTY CYCLE
CAUTION