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INSTALLATION
A3.3 A3.3
CLASSIC® 300D & 300G
GENERAL DESCRIPTION
The CLASSIC
®
300D KUBOTA is a heavy duty, engine
driven, DC arc welding power source, capable of pro-
viding 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® 300D
KUBOTA will provide constant voltage output for run-
ning the LN-7, LN-23P, or LN-25 wire feeders. (The
Wire Feed Module is factory installed on the K1643-6).
The optional K924-5 Remote Control Kit, provides a
remote control rheostat for remote fine current and
open circuit voltage adjustment. See Section C for
description.
The CLASSIC® 300D KUBOTA 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® 300D KUB-
OTA has a current range of 40-350 DC amps with out-
put ratings as follows:
These units are also capable of providing 3 kVA of
115/230 volts of 60 cycle AC auxiliary power.
The CLASSIC® 300D KUBOTA uses the Kubota
V2203M industrial water-cooled diesel 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” rheostat. The welder is equipped with a
“Start” button, an “Ignition” switch, an “Idler” control
switch, and a “Glow Plug” button for easier cold weath-
er 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 circuit breakers for auxiliary power.
All Copper Windings - For long life and dependable
operation.
250A @ 30V
300A @ 32V
100%
60%
RATED OUTPUT DUTY CYCLE
Engine Idler - The Classic® 300D is equipped with an
electronic automatic engine idler. It automatically
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” con-
trol switch on the panel locks the idler in high idle posi-
tion 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
in Section C 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 stan-
dard.
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 oper-
ation.
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.
Refer to Troubleshooting section for all warning light
fault codes.
High Idle RPM (OCV) Adjustment - A Potentiometer
is mounted on the Control Panel that allows the opera-
tor to adjust the high idle engine speed between 1650
and 1800 RPMʼS. This is to allow further adjustment of
the OCV. Total OCV adjustment range is about 15
volts.
Oil Drain Valve - A ball valve, hose and clamp are
standard.
Remote Control - The Remote/Local switch and
Receptacle are standard.
GFCI Receptacle - One UL approved 115V ground
fault circuit interupter duplex type receptacle is stan-
dard on codes 11243 and above. See MAINTENANCE
section for detailed information on testing and resetting
the GFCI receptacle.
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