Turn the D.C. ampere selector switch (fig.
(4)
(2) Switch air compressor circuit breaker (fig.
2-13) so that the desired amperes (welding) range is
2-13) ON.
directly under the arrow at the top of the selector
(3) Open air receiver drain cock and drain
switch. The D.C. ampere fine adjustment rheostat
condensation from tank.
located in the center of the selector switch can now
(4) Press start switch (fig. 2-11) to start.
be adjusted to the desired amperes within the range
(5) To stop compressor, push stop reset button
shown at the top of the range selector- switch. For
and place the air compressor circuit breaker OFF.
remote fine adjustment at the welding area, remove
(6) The air compressor pressure switch (fig. 2 -
the fine adjustment rheostat assembly, pressing
11) will automatically shut down the compressor
u p w a r d on the latch under the handle of the
when pressure reaches 150 psi; and will re-start the
rheostat and pulling outward. Install appropriate
compresser as soon as pressure falls below 125 psi.
cable between rheostat and outlet.
g. Lathe Operation.
(1) Energize the electrical system, as explained
NOTE
in a or b above.
Experience alone will enable the operator to determine
the correct D.C. ampere and polarity required for the
(2) Move the lathe reversing lever to the OFF
particular welding to be accomplished.
position.
(3) Switch lathe circuit breaker on the welder
CAUTION
control panel ON.
Do not change the setting of the D.C.
(4) Lathe may now be operated from its in-
a m p e r e range selector switch, or the
stalled position.
fine adjustment while welding is being
h. Mill Operation.
performed.
(1) Energize the electrical system for either
WARNING
internal or external power.
When the dynamotor-welder is rigged
(2) Switch the mill circuit breaker ON.
f o r remote fine adjustment of D,C.
(3) Remove hardware that secures the milling
amperes, the rheostat assembly must be
attachment in its stored position, and install on the
p r o t e c t e d from elements that are a
lathe cross slide in place of the compound slide.
conductor of electricity such as water,
(4) Operate the mill from installed position.
mud, etc.
(5) Place the polarity switch in the OFF
NOTE
Experience alone will enable the operator to install the
position when welding is not being performed, to
milling attachment on the lathe in the position that will
prevent possible damage to the circuit. To stop the
produce the beet results.
dynamotor-welder from developing D.C. current,
i. 120-Volt, Single-Phase Receptacles.
the rotation of the dynamotor-welder must be
stopped.
(1) Energize the electrical system for either
internal or external power.
(a) When the truck engine is the power
source and you have been operating with the power
(2) Switch the R 1, R2, and R3 circuit breaker
selector switch (fig. 2-13) in OFF position, reduce
ON. This will energize the R 1, R2, R3, and other
engine speed and disengage power take-off.
120-volt, single-phase receptacles.
(b) When the truck engine is the power
NOTE
source, and you have been operating with the power
On emergency power, only receptacle R3 may be
selector switch in GENERATOR position, press
utilized,
the dynamotor stop switch (fig. 2-13) and reduce
j. 240-Volt, Single-Phase Receptacles.
engine speed and disengage power take-off.
(1) Energize the electrical system for either
(c) When external power source is used,
internal or external power.
momentarily press the dynamotor stop switch.
(2) Switch the R4, R5, and R6 circuit
f. Air Compressor Operation.
breakers ON. This energizes the R4, R5, R6, and
(1) Energize the electrical system as explained
other 240-volt, single-phase receptacles.
in a or b above.
Section V. OPERATION UNDER UNUSUAL CONDITIONS
tremely cold operating conditions, allow a warm-
ing-up period to allow the engine to reach normal
a. Air Compressor. Refer to current lubrication
operating temperature range before operating the
order for cold weather lubrication instructions.
dynamotor-welder.
b. Dynamotor-welder. When the dynamotor-
C. Wiring. Do not attempt to service or move the
welder is driven by the truck engine during ex-
