TM 9-4940-421-14
dc ampere fine adjustment rheostat located in the
safety ground terminal on the control panel and the
ground rod.
center of the selector switch can now be adjusted to the
desired amperes within the range shown at the top of
c. Connect electrode and ground cable to the output
the range selector switch.
terminals.
CAUTION
Do not change the setting of the dc am-
Move the throttle to the run position. When frequency
pere range selector switch, or the fine
meter reads 60 hz the welder is ready for operation.
adjustment while welding is being per-
formed.
that the desired amperes (welding) range is directly
NOTE
under the arrow at the top of the selector switch. The
For best results unwind cables before welding.
Section II. OPERATING UNDER UNUSUAL CONDITIONS
all equipment carefully and frequently. Cover all ex-
.
posed or partially exposed components when not in use.
lubrication for cold weather operation.
b. Lubrication. Observe all lubrication instructions.
b. Welder. Allow a warm-up period to allow the
c. Fuel System. Take all precaution to keep the fuel
engine to reach normal operating temperature before
and fuel system free from dust and foreign particles.
operating the welder.
Inspect the fuel strainer bowl more frequently than
under normal circumstances.
c. Wiring Do not attempt to service or move the wir-
ing during extremely cold temperatures. Bending a
wire under these conditions may cause cracks and
TIONS.
breaks in the insulation and the wiring.
a. General. Provide adequate ventilation and shelter
d. Fuel System. Fuel tank should be kept as full as
to protect the shop set from rain and humidity. Remove
possible at all times to reduce the possibility of
any covering during dry periods to aid in drying out of
moisture forming in the tank.
the shop set and components.
b. Fuel System. Keep fuel tank full to avoid conden-
sation in the tank.
lubrication for extreme heat.
c. Welder. Do not attempt to weld in the direct
b. Generator-Welder. Maintain maximum ventila-
presence of rain or when condensate is forming on
tion through the generator-welder at all times.
metal parts in an extremely humid atmosphere.
d. Generator. All connections must be dry and
2-9. OPERATION IN DUSTY OR SANDY
maintained dry and all interconnecting cables must be
AREAS.
waterproof, properly connected and maintained to
a Protection. Locate the shop set in a well-protected
area whenever possible. Make sure that all weather
avoid any shock hazard.
seals are in good condition and properly seated. Clean
Section Ill. ENGINE PROTECTION BETWEEN SHORT PERIOD OPERATING INTERVALS
manifold while the engine is warm and running at
moderate speed. About a quarter of a pint is necessary,
interval is completed, the following instructions should
or enough so that a heavy bluish smoke will appear at
be carried out very carefully to protect the engine. To
protect the cylinders, pistons, rings and valves and
the exhaust. The ignition switch should then be shut off
and the engine stopped. This fogging operation will
keep them from rusting and sticking, rust preventive
give a coating of oil on the above-mentioned parts pro-
oil, as specified under Military Specification MIL-
tecting them from the atmosphere.
0-6082, (type 1, ready mixed, or equivalent), should be
injected into the pipe tap opening on the intake
