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B-2
ENGINE OPERATION
Operate the welder with the doors closed. Leaving the
doors open changes the designed air flow and can
cause overheating.
STARTING THE D503K 5+3 HO WITH
KUBOTA DIESEL ENGINE
Refer to the Welder Nameplate for starting instruc-
tions.
The D503K 5+3 HO engine is equipped with GLOW
PLUGS. The GLOW PLUGS should always be used
to help start Kubota diesel engines. Follow the table
below for approximate GLOW PLUG on times to be
used prior to attempted starting:
Temperature
Above 32ºF (0ºC)
32ºF to -13ºF (0ºC to -25ºC)
Below -13ºF (-25ºC)
Note: Extreme cold weather starting may require
longer glow plug operation as well as engine oil and
coolant heating (using a block heater).
WARNING
Under NO conditions should ether or other
starting fluids be used!
------------------------------------------------------------------------
STOPPING THE ENGINE
1. Pull the "STOP" knob out and hold it out until the
engine stops completely.
At the end of each day's 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.
When moving 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. Use qualified person-
nel to do this per the instructions in the MAINTE-
NANCE section of this manual.
OPERATION
GLOW PLUGS ON time
15 sec.
30 sec.
45 sec.
WELDER OPERATION
WARNING
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.
DUTY CYCLE
The output rating of the D503K 5+3 HO is 400
amperes at 40 arc volts on a 100% duty cycle.
WELDER CONTROLS
POLARITY SWITCH
Turn the Arc Polarity switch to electrode positive or
electrode negative as required for each particular
application.
CONTROL OF WELDING CURRENT
PURPOSE OF CONTROLS
The continuous "Current Control" is the main current
adjuster. The "Job Selector" is both a fine current
adjuster and the continuous Open Circuit Voltage
adjuster. Open Circuit Voltage (OCV) controls the arc
characteristics.
"JOB SELECTOR"
The "Job Selector" dial is divided into four colored
sections providing OCV ranges as follows:
Color
Title
White
Large Electrodes
Black
Normal Welding
Red
Overhead & Vertical
Grey
Special Applications
The "Job Selector" is usually set in the black range
because it provides a soft "Buttering " arc desired for
most welding. Some operators prefer to set the "Job
Selector" in the red range for a snappy "Digging" arc
when welding vertical up or overhead.
D503K 5+3 HO
B-2
OCV Range
High OCV
Medium OCV
Low OCV
Extra-Low OCV
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