Advertisement
4- 1 6 REAR SUSPENSION
Figure 17-Measuring Resistance Across Diode
common, and "3" for normally open.
Inlet
pressure can be applied at any port .
a
Inlet pressure applied at normally closed
port (1): Air is stopped internally . With
12 volts applied (solenoid energized) air
will flow from normally closed port (1) to
common port (2).
No air at normally
open port (3).
CAUTION: Whenever it is necessary to support the rear suspension with jack stands
or other supporting equipment; be sure the jack stands are used only at junction
points of the frame rail and crossmember . Failure to locate jack stand as instructed
could result
in
damage to frame of vehicle .
Removal procedure for height control valve, air bellows, control arm and shock
absorber are given in REAR SUSPENSION (SEC . 4) of Maintenance Manual X-7525 .
AIR COMPRESSOR REMOVAL
1. Release
pressure
in
system
through
Schrader valve at wet tank .
2. Disconnect electrical leads at rear of
compressor motor .
3. Disconnect air lines at back of com-
pressor and at head of one piston .
4. Remove bolts securing compressor to
mounting bracket and remove compressor.
PRESSURE SWITCH REMOVAL
1. Release pressure in system through wet
tank Schrader valve .
2. Remove screw at top of pressure switch
cover and remove switch cover .
COMPONENT REMOVAL
WET TANK REMOVAL
Inlet pressure applied at common port
(2): Air flows out normally open port (3).
With 12 volts applied (solenoid energized)
air will flow from common port (2)
through normally closed port (1). No air
at normally open port (3).
Inlet pressure applied at normally open
port (3) : Air flows out common port (2) .
With 12 volts applied (solenoid energized)
air will flow from normally open port (3)
to normally closed port (1).
No air at
common port (2).
MEASURING RESISTANCE OF DIODE
With the Electro-Level option there are two
diode assemblies in the wiring harness (figure
17).
These can be tested using a volt
ohmmeter . Holding two meter leads to either
side of diode, measure the resistance in one
direction .
Reverse the test lead connections
to
measure
the
resistance
in
the
other
direction . If the diode is good, the resistance
in one direction will be much higher than the
resistance in the other direction . If diode does
not test good, replace .
3. Disconnect two electrical leads secured
by screws inside switch body .
4 . Remove bolts securing pressure switch in
place .
Remove
copper
fitting
securing
pressure switch to wet tank .
5 . Remove pressure switch .
1. Release air from system at Schrader
valve on wet tank .
2 . Disconnect air lines.
3. Remove wet tank mounting elbow from
manifold .
4. Remove copper fitting, check valve and
Schrader valve from tank .
Advertisement
