(3) To lower the pressure cutout point,
decrease spring tension by turning the
adjusting nut (7) counterclockwise.
(4) The loading pressure is 150 psi. Any
change in the pressure cutout setting will
raise or lower the cutin point a
corresponding amount.
b. Differential Adjustment.
(1) The differential adjusting screw (6), is
used to increase or decrease the
difference in pounds of pressure between
the cutin and cutout points on the
compressor pressure switch.
(2) To increase the differential setting turn the
adjusting screw clockwise.
(3) To decrease the differential setting turn
the adjusting screw counterclockwise.
(4) When the differential setting is increased
or decreased, all changes take place in
the cutin point. The cutout point remains
constant.
136. Two-Way Release Valve
a. Removal.
(1) Disconnect the tank control valve air tube
(5, fig. 36) from the two-way release valve
1
Air pressure gage
(6).
2
Air tube-to-tank control valve
3
Throttle control line
(2) Disconnect the throttle control air tube (2)
4
Two-way release valve
and the auxiliary release valve air tube
5
Screw, 1/4--28 x 3/8 in. lg (2 rqr)
(22) from the compression tee (4).
6
Adjusting screw
(3) Remove the compression tee from the
7
Adjusting nut
two-way release valve (6).
Figure 35. Pressure switch adjustment.
(4) Remove the two screws (7) which secure
the two-way release valve to the pressure
switch (8), and remove the two-way
coupling (15), and plug (16) in the
release valve.
compressor crankcase.
b. Cleaning, Inspection, and Repair.
(2) Refill the crankcase with oil in accordance
(1) Clean the release valve, using an
with LO 5-4930-202-20.
approved cleaning solvent.
135. Pressure Switch
(2) Inspect the two-way release valve. If any
a. Pressure Adjustment.
parts are worn or damaged, replace.
(1) Remove the two screws (2, fig. 34), which
c. Installation.
secure the pressure switch cover (3), and
(1) Position the two-way release valve (6, fig.
remove the cover from the pressure
36) on the pressure switch (8), and install
switch.
the two screws 47) which secure the valve
(2) The unloading pressure is 175 psi. To
to the pressure switch.
raise the pressure cutout point, increase
(2) Install the compression tee to the two-way
tension on the range spring by turning the
release valve (6).
adjusting nut (7, fig. 35) clockwise.
(3) Connect the throttle control air tube
75
