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OPERATION
B5.3 B5.3
CLASSIC® 300D & 300G
• When hauling the welder between job sites, close the
fuel feed valve beneath the fuel tank.
• If the fuel supply is cut off or runs out while the fuel
pump is operating, air may be entrapped in the fuel
distribution system. If this happens, bleeding of the
fuel system may be necessary. Refer to the instruc-
tions in the MAINTENANCE section of this manual.
REFER TO THE ENGINE
Operation and maintenance manual for additional
information on the engine supplied with this welder.
WELDER OPERATION
DUTY CYCLE
The NEMA output rating of the Classic® 300G 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.
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrode with skin or wet clothing.
• Insulate yourself from work and ground.
FUMES & GASES can be dangerous.
• Keep your head out of the fumes.
• Use ventilation or exhaust to remove
fumes from breathing zone.
WELDING SPARKS can cause fire or
explosion.
• Keep flammable material away.
ARC RAYS can burn.
• Wear eye, ear, and body protection.
WARNING
Air Cleaner - Heavy duty two stage dry type.
Muffler-A Muffler and stainless steel exhaust outlet
elbow are standard.
Engine Hour Meter - A meter to record hours of opera-
tion.
Engine Protection - The system shuts the engine
down in the event of sudden low oil pressure or high
coolant temperature. A warning light on the control
panel will indicate such a fault. To reset the engine for
restarting, turn the ignition switch off then on.
High Idle RPM (OCV) Adjustment- A potentiometer is
mounted on the output rail that allows the operator to
adjust the high idle engine speed between 1700 and
1800 RPMʼS in 20 RPM increments. This is to allow fur-
ther adjustment of the OCV. Total OCV adjustment
range is about 10 Volts.
STARTING THE CLASSIC® 300G GM 3.0L
GASOLINE ENGINE
1. Turn the “IDLER” switch to “HIGH”.(Optional )
2. Turn the “IGNITION” switch to “ON”.
3. Press the Start button. When the engine starts run-
ning, release button. If the engine fails to start in 20
seconds, wait 30 seconds and repeat the above pro-
cedure.
4. Observe the oil pressure. If no pressure shows with-
in 30 seconds, stop the engine and consult the
engine operating manual. To stop the engine, turn
the “IGNITION” switch to “OFF”.
5. Allow the engine to run at high idle speed for sev-
eral minutes to warm up. If idle control switch is left
in “Auto” position, engine will run at 1600 RPM until
engine coolant temperature reaches 130 F.
Under NO
conditions should ether or other starting
fluids be used!
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STOPPING THE ENGINE
• Turn the “IGNITION” switch to “OFF”
• At the end of each dayʼs welding, check the crankcase
oil level, drain accumulated dirt and water from the
sediment bowl under the fuel tank and refill the fuel
tank to minimize moisture condensation in the tank.
Also, running out of fuel tends to draw dirt into the fuel
system.
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