Section I. OPERATING PROCEDURES
2-1. GENERAL. This
f. Throttle Control The throttle control (fig 2-1)
controls and instruments and provides the operator or
used to adjust engine speed to the desired rpm. Turn
crew sufficient information to operate the shop set.
the handle counterclockwise and pull out to decrease
rpm and push in to increase rpm. Pull out to idle and
2-2. CONTROLS AND INSTRUMENTS.
push in to run.
a Frequency Meter. The frequency meter (fig 2-1)
g. Ignition Switch. The ignition switch (fig 2-1)
is a 3
indicates the output power of the welder when driven
position switch, used to start and stop the shop set
by the gas engine. Normal reading is 60 hertz when the
engine is driving the welder at 1800 rpm.
h. Circuit Breakers. There are five circuit breakers
b. Running Time Meter. The running time meter
Three 15A circuit breakers
protect the recep-
tacles and body wiring circuits. The 30A circuit
c. Oil Pressure Gage. The oil pressure gage (fig 2-1)
breaker protects the air compressor circuit. The 40A
indicates the engine oil pressure. Abnormal oil pres-
circuit breaker protects the main power circuit.
sure, the needle should point to the green. If the needle
i. Receptacles. The receptacles (fig 2-1
) are 115 volt
points to the red, stop the engine and determine the
cause for low oil pressure.
type and J3 and J4 are the three-prong type.
d. Buttery Ammeter. The battery ammeter (fig 2-1)
j. D. C. Ampere Selector Switch. The switch (fig 2-1)
measures the dc current flow to and from the battery.
is used to select the welding ampere range required for
It is calibrated in 10 ampere increments from -30 to
all welding to be accomplished. Each welding ampere
+30. Normal indication of the meter is dependent upon
range shown on the switch shows a minimum and max-
the charge of the battery. A low charge, such as exists
imum for the range selected, and should be further ad-
immediately after engine starting, will result in a high
justed with the dc ampere adjusting rheostat.
reading. When the charge has been restored to the bat-
tery the indicator should read near 0.
k. D. C. Ampere Adjusting Rheostat. This rheostat
e. Choke Control The choke
control (fig 2-1)
(fig 2-1) regulates the
dc welding amperage within the
to increase fuel intake for initial starting and warm up
ampere range selected at the dc ampere selector
of a cold engine. Pull out to start engine and push
switch. Turn the adjusting rheostat clockwise to in-
slowly as the engine warms up. Push choke in during
crease the welding amperage and counterclockwise to
decrease the amperage.