TM 5-4310-358-14
Table 5-1. Troubleshooting (Con't)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check pressure switch for
a. Start the air compressor to determine
proper setting.
adjustment. The pressure switch is preset
by manufacturer at 165 psi (11.60 kgs)
CUT-IN, and 190 psi (13.36 kgs) CUT-OUT
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 (fig. 5-5).
d. To decrease the difference between the
CUT-IN and CUT-OUT pressure, turn the
differential screw counterclockwise
CAUTION
When adjusting the differential screw, do not turn it farther than it will turn easily.
e. To increase the differential and
maintain the same CUT-OUT pressure, turn
the differential screw clockwise and, at
the same time, the pressure adjusting
screw counterclockwise.
NOTE
If the differential is increased only by turning the differential screw clockwise, and
CUT-IN pressure changes only slightly, and the CUTOUT pressure rises.
f. Turn on the outside power to check the
adjustment. To check the CUT-IN pressure,
open the drain cock and allow pressure to
fall below 165 psi (11.60 kgs). Close the
drain cock and the compressor should start
immediately.
g. Install the cover on the pressure
switch.
Figure 5-5. Pressure switch adjustment.
5-11
