GMC 1976 ZEO 6083 Maintenance Manual page 213

Figure 61-Spindle Installed
16 . Apply air to bellows.
17 . Install tire and wheels .
18 . Lower vehicle to floor and allow leveling
valve to bring vehicle to ride height .
19 . Bleed brakes as described in Section 5 Brakes .
Figure 62-Backing Plate Installation
REAR SUSPENSION 4- 2 9
Figure 63-Installing Thrust Bearings
SHOCK ABSORBER
INSTALLATION
Block control arms in an up position with a
wooden block about one inch in thickness as shown
in Figure 27 . Install top of shock in upper control
arm and secure with nut . Install bottom of shock on
mounting bracket on frame rail, and secure with nut.
POWER LEVEL VALVE
INSTALLATION
1 . Wrap threads on air line fittings with teflon
tape .
2. Install lines to back of valves, referring to Fig-
ure 66 . On the right valve, red line goes to the port
marked "MAN .," blue line goes to the port marked
"OUT," and yellow lines goes to the port marked
"AUTO." On left valve, red line goes to the port
marked "MAN .," gray line goes to the port marked
"OUT," purple line goes to the port marked
"AUTO."
3 . Install two screws holding valve to mounting
panel (See figure 29).
4. Install four screws holding mounting panel to
dash .
5 . Install control knob using Allen Head screw in
center of knob .
6 . Close drain cock on air reservoir, place control
knob in travel position, and operate compressor until
suspension comes up to ride height . Check for air
leaks.