TM 5-4310-356-14
CHAPTER 2
OPERATING INSTRUCTIONS
WARNING
If equipment fails to operate, refer to troubleshooting procedures in Chapter 3.
Section I. OPERATING PROCEDURES
tripped manually by pulling up on the ring at the end. It
2-1. Controls and Instruments.
is manually tripped to release pressure in the air
receiver tank and to test the valve.
a. General.
This section describes, locates,
illustrates and furnishes the operator sufficient
g. ON-OFF Starter Switch. The on-off starter
information pertaining to the various controls and
switch (fig. 1-1) is a manually actuated switch located
instruments provided for the proper operation of the air
top center of the motor starter box cover. In OFF
compressor.
position the compressor motor will not operate. When
the selector is turned to ON position the compressor will
operate until pressure in air receiver tank reaches 190
mounted on the end of the air receiver tank is a
psi (13.36 kgs per sq cm) then the pressure switch
manually operated valve that opens the flow of
automatically shuts-off the motor. The compressor will
compressed air to the air hose.
recycle again automatically when pressure drops below
165 psi (11.60 kgs per sq cm) and continue to cycle
on the underside of the air receiver tank is a manually
automatically in this ON position.
operated valve used to drain compressed air and
condensation from the air receiver tank. Receiver
mounted on the cover of the magnetic starter, below the
should be drained daily when the air compressor is in
ON-OFF switch, is manually operated button, which
use.
when pushed, resets the thermal relay in the magnetic
starter.
mounted in the compressor crankcase is a direct
i. Pressure Switch. The pressure switch (fig. 12)
reading, glass covered gage used to check the level of
is mounted on the top of the air receiver tank at the
the oil in the compressor crankcase.
motor end. It automatically shuts off the motor when the
e. Air Receiver Tank Pressure Gage. The air
pressure in the air receiver tank reaches 190 psi (13.36
receiver tank pressure gage (fig. 1-1) mounted on the
kgs per sq cm). The pressure switch will automatically
side of the air receiver tank, is a needle-indicating,
recycle the compressor when the pressure drops below
direct-reading, pressure-operated gage graduated in
165 psi (11.60 kgs per sq cm).
pounds per square inch (psi) and kilograms per square
centimeter (kgs per sq cm), the gage is graduated from
controls and indicates the amount of air being
0 to 300 psi in increments of 5 psi, and from 0-21.1 kgs
discharged.
sq cm in increments of 50 centimeters. The gage
indicates the air pressure in the air receiver tank.
2-2. Operation Under Usual Conditions.
Normal operating pressure is 165 psi (11.60 kgs per sq
cm) to 190 psi (13.36 kgs per sq cm).
a. General. The instructions in this section are
f. Safety Relief Valve. The safety relief valve
published for the operation of the air compressor. It is
essential that the operator know how to perform every
the motor end. It is a preset valve that is actuated when
operation of which the air compressor is capable. This
the air receiver tank receives a pressure of 200 psi
section gives instructions on starting and stopping, and
(14.06 kgs per sq cm) or more. This valve can be
air-pressure adjustment.
2-1
