Note. Do not operate machine with choke
knob pulled out after coolant has reached operating
temperature.
(4) After engine has operated for 10 to
20 seconds, check oil pressure gauge for indi-
cation of oil pressure.
Caution: If no oil pressure is indicated
after 30 seconds of operation, stop engine and
locate source of trouble.
STEP 1. PUSH MAGNETO SWITCH IN.
MSC 3431-214-15/8
Warning: Do not perform any welding
operation without a welder's helmet. The flash
HOLD DOWN
START
MAGNETO
SWITCH
SWITCH
of the welding arc can cause injury to the eyes.
SWITCH
STEP 1. PLACE POLARITY SWITCH IN " OFF " POSITION
STEP 2. HOLD HOLD-DOWN-TO-START SWITCH DOWN.
STEP 3. PULL MAGNETO SWITCH OUT.
a. Refer to figure 2-7 for normal and au-
STEP 4. DEPRESS ENGINE START SWITCH.
xiliary operation of the equipment.
MSC 3431-214-15/7
Note. Use portable job selector for remote work.
b. Welding Methods.
(1) When welding in the vertical and
overhead position, the operator should have a
2-13. Stopping
strong digging arc for penetration and a cool
a. Normal Stopping.
arc to let molden metal solidify. With job se-
(1) Engine idle regulator will automati-
lector set in the red section for a medium-low
cally return engine to idling speed of about 950
open-circuit voltage (overhead and vertical
rpm when welding arc is extinguished. Allow
setting), the electrode is pulled away, the cur-
engine to idle a few minutes to cool down.
rent will cut down to a lower figure, cooling
(2) Refer to figure 2-6 to stop engine.
the puddle and letting the metal solidify. The
Caution: Do not pull out choke when
"in" and "out" motion, combined with normal
stopping engine as raw gasoline will wash lubri-
whipping techniques, gives operator complete
cant cylinder walls.
control over the puddle during vertical and
(3) Close fuel shut-off valve below fuel
overhead welding.
tank.
(2) When welding down hand or for sheet
AGO 20030A
