TM 5-4310-356-14
5-9. Air Pressure Adjustment.
adjustment.
The pressure switch is preset by
manufacturer at 165 psi CUT-IN, and 190 psi CUTOUT
setting. If adjustment is necessary shut off the outside
power source.
b. Remove cover from pressure switch.
c. To raise the CUT-IN and CUT-OUT pressure
turn the pressure adjusting screw clockwise. Refer to
d. To decrease the difference between the CUT-IN
and CUT-OUT pressure turn the pressure adjusting
screw clockwise. Refer to figure 5-15.
e. To decrease the difference between the CUT-IN
and CUT-OUT pressure, turn the differential screw
counterclockwise. Refer to figure 5-15.
CAUTION
When adjusting the differential
screw, do not turn it farther than it
will turn easily.
f. To increase the differential and maintain the
same CUT-OUT pressure, turn the differential screw
clockwise and, at the same time, turn the pressure
adjusting screw counterclockwise.
NOTE
If the differential is increased only
by turning the differential screw
clockwise, the CUT-IN pressure
changes only slightly, and the
CUT-OUT pressure rises.
Figure 5-13. Pressure switch assembly, removal
and installation (shown with cover removed).
g. Turn on the outside power source to check the
adjustment. To check the CUT-IN pressure, open the
drain cock and allow air pressure to fall below 165 psi.
Close the drain cock, and the compressor should start
immediately.
h. Install the cover on the pressure switch.
5-24
