TM 5-4310-349-14
(2) Refer to figure 5-5 and install the magnetic
b. Remove cover from pressure switch.
starter in reverse order of the removal procedure.
c. To raise the CUT-IN and CUT-OUT pressure turn
5-8.
Pressure Switch
the pressure adjusting screw clockwise. Refer to figure 5-9.
a. Removal and Disassembly.
d. To decrease the difference between the CUT-IN
(1) Refer to figure 5-7 and remove the pressure
and CUT-OUT pressure, turn the differential screw
switch as shown.
counter-clockwise. Refer to figure 5-9.
(2) Refer to figure 5-8 and disassemble the
CAUTION
pressure switch as shown.
When adjusting the differential
b. Cleaning, Inspection and Repair.
screw, do not turn it farther than it
(1) Use compressed air and remove all dust and
will turn easily.
dirt from pressure switch components, then wipe with a
e. To increase the differential and maintain the
cloth dampened in cleansing solvent.
same CUT-OUT pressure, turn the differential screw
(2) Inspect the contact board contacts for pitting
clockwise and, at the same time, turn the pressure-
or burring.
adjusting screw counterclockwise.
(3) Inspect diaphragm for cracks or breaks and
general condition.
NOTE
(4) Inspect all threaded parts for damaged or
If the differential is increased only by
defective threads.
turning
the
differential
screw
(5) Repair or replace damaged or defective
clockwise, the CUT-IN pressure
parts as necessary.
changes only slightly, and the
c. Reassembly and installation.
CUTOUT pressure rises.
(1) Refer to figure 5-8 and reassemble the
pressure switch.
f. Turn on the outside power source to check the
(2) Refer to figure 5-7 and install pressure
adjustment. To check the CUT-IN pressure, open the
switch in reverse order of the removal procedure.
drain cock and allow air pressure to fall below 140 psi.
5-9.
Air Pressure Adjustment
Close the drain cock, and the compressor should start
immediately.
adjustment.
The pressure switch is preset by
g. Install the cover on the pressure switch.
manufacture at 140 psi CUT-IN, and 175 psi CUT-OUT
setting. If adjustment is necessary shut off the outside
power source.
Change 2 5-8
