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REAR SUSPENSION
3D-2
1
STEP 10
-
Disconnect shock absorber air supply tubing from height control valve and attach gauge
5-22124 to tubing. Using an external air supply, inflate shocks to 100 p.s.i. and observe if
pressure holds steady or drops off. Refer to Figure
8.
NOTE: Soap suds may be used to help
locate leak condition.
EXTERNAL
AIR SUPPLY
(100 psi)
BlNG TO
OCK ABSORBE
,
HIGH PRESSURE
TUBING FROM
COMPRESSOR
NOTE: RIGHT-ANGLE FITTINGS SHOWN.
FITTINGS ON SOME APPLICATIONS ARE
STRAIGHT TYPE
EXHAUST
E L ARM
FIGURE 8-CHECKING OUT HEIGHT CONTROL VALVE
Vehicle Raises and pressure holds steady
Pressure drops off
I
Proceed ; o Step
12
Proceed tb Step 11
STEP 11
-
Check each shock separately for leaks a s follows: Connect test gauge 5-22124 individually to
each shock and inflate shock to 100 psi. Observe if pressure holds steady or drops off.
I
I
1
Pressure holds steady
Pressure drops off
I
I
Recheck tubing and fittings per Step
8
Replace shock(s) as required and
IMPORTANT:
recheck system per step 6
I f extremely slow leak down condition occurs only during cold weather, one or both shocks may be the cause.
To duplicate this type of leak condition requires that the shocks be as cold as the surrounding ambient temper-
ature. By the time an owner drives to the service account or dealer the shocks develop heat and the leak usually
disappears. A method t o determine which shock or if both are leaking follows:
A.
Attach a test gauge to each shock and inflate t o 100 p.s.i.
6 . Position or attach gauges so that they may be read without the vehicle on a hoist.
C. Move vehicle outside and recheck gauges periodically. NOTE: Pressure will decrease with temperature
and gage will show this when vehicle is moved outside.
FIG. 3D-28 AUTOMATIC LEVEL CONTROL DIAGNOSIS
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