TM 5-4310-349-14
CHAPTER 2
OPERATING INSTRUCTIONS
WARNING
If
equipment
fails
to
operate,
refer
to
troubleshooting procedures in Chapter 3.
Section I. OPERATING PROCEDURES
compressor will operate until pressure in air receiver
2-1.
Controls and Instruments
tank reaches 175 psi, then the pressure switch
a. General.
This section describes, locates,
automatically shuts off the motor. The compressor will
illustrates, and furnishes the operator sufficient
recycle again automatically when pressure drops below
information pertaining to the various controls and
140 psi, and continue to cycle automatically in this ON
instruments provided for the proper operation of the air
position.
compressor.
below the ON-OFF switch, is a manually operated
a manually operated valve that opens the flow
button, which when pushed, resets the thermal relay in
of compressed air to the air hose.
the magnetic starter.
c. Drain Cock.
The drain cock (fig. 1-1)
mounted on the underside of the air receiver tank is a
2-2.
Operation Under Usual Conditions
manually operated valve used to drain com- pressed air
a. General. The instructions in this section are
and condensation from the air receiver tank. Receiver
published for the operation of the air compressor. It is
should be drained daily when the air compressor is in
essential that the operator know how to perform every
use.
operation of which the air compressor is capable. This
d. Oil Level Gage. The oil level gage mounted
section gives instructions on star- ting and stopping, and
in the compressor crankcase (fig. 1-1) is a direct-
air-pressure adjustment.
reading, glass-covered gage used to check the level of
b. Starting.
the oil in the compressor crankcase.
(1) Inspect the electric motor to make sure it
e. Air Receiver Tank Pressure Gage. The air
is properly wired from incoming power source and that
power is on.
on the side of the air receiver tank, is a needle-
indicating, direct-reading, pressure operated gage
"ON" position.
graduated from 0- to 300-psi in increments of 5 psi. The
gage indicates the air pressure in the air receiver tank.
NOTE
Normal operating pressure is 140- to 175-psi.
Should the compressor fail to start, depress
f.
Safety Relief Valve. The safety relief valve
the reset button.
at the motor end. It is preset valve that is actuated
when the air receiver tank receives a pressure of 200 or
c.
Stopping.
more psi. This valve can be tripped manually by pulling
up on the ring. It is manually tripped to release pressure
in the air receiver tank and to test the valve.
"OFF" position.
g. On-off Starter Switch. The on-off starter
the bottom of air receiver tank to release the
located top center of the magnetic switch box cover. In
compressed air and condensate from the air receiver
OFF position the compressor motor will not operate.
tank.
When the selector is turned to ON position the
(4) Close drain cock.
Change 2 2-1
