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GENERAL DESCRIPTION
The CLASSIC® ® 300D KUBOTA 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 cop-
per coils, rated at 300 amps/32 Volts, and provides
other Classic® features such as improved door latch-
es and stainless hinges. With the addition of the
optional K623-1 Wire Feed Module ™ , the CLASSIC®
300D KUBOTA will provide constant voltage output for
running the LN-7, LN-23P, or LN-25 wire feeders.
(The Wire Feed Module is factory installed on the
K1643-10). The optional K924-5 Remote Control Kit,
provides a remote control rheostat for remote fine cur-
rent 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:
RATED OUTPUT
250A @ 30V
300A @ 32V
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
V2403M 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
weather starting.
The control panel also contains an engine tempera-
ture gauge, a battery charging ammeter, an oil pres-
sure gauge, two three prong grounding type recepta-
cles and circuit breakers for auxiliary power.
All Copper Windings - For long life and dependable
operation.
INSTALLATION
DUTY CYCLE
100%
60%
CLASSIC® 300D KUBOTA
Engine Idler - The Classic® 300D is equipped with
an electronic automatic engine idler. It automatically
increases and decreases engine speed when start-
ing and stopping welding or using auxiliary
power. A built-in time delay permits changing elec-
trodes 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 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 oper-
ator to adjust the high idle engine speed between
1650 and 1800 RPMʼS. This is to allow further adjust-
ment 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. See MAINTENANCE section for detailed infor-
mation on testing and resetting the GFCI receptacle.
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Troubleshooting
