GMC 1976 ZEO 6083 Maintenance Manual page 206

4- 22 REAR SUSPENSION
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Screw, Cover Plate & Mounting Bracket
Cover Plate and Mounting Bracket
Gasket, Cover Plate & Mounting Bracket
Retaining Ring
Retainer, Delay Piston
"0" Ring
Valve Body
"0" Ring
Screen
Intake Valve Adapter Assembly
Gasket
Adapter
Screen
"0" Ring
Check Valve - Exhaust
Exhaust Tube
Tube Fitting
Adapter
Gasket
Adapter Assembly
Screen
"0" Ring
Arm
Nut, Arm Retaining
Fastener, Plug Retaining
A-1302
HEIGHT CONTROL VALVE
ADJUSTMENTS
GENERAL
To properly adjust the height control valve, it is
ESSENTIAL that the following procedures be fol-
lowed and in the sequence mentioned:
Three main adjustments are required :
1 . Overtravel lever center position adjustment .
2. Air intake and exhaust valve lever gap adjust-
ments.
Figure 49-Height Control Valve
3 . Time delay check.
NOTE: The height control valve assembly must
be removed from vehicle to make the above ad-
justments .
Instructions for checking the ride height dimen-
sions are explained under "Ride Height Check and
Adjustment ."
IMPORTANT: The silicone fluid should be
drained from control valve assembly before
making the first two adjustments.