GMC 4000 Series Service Manual page 127

Sec. 3C
Page 120
FRONT SPRINGS
Figure 7— Rem oving Rubber Type Eye Bushing (PS4500)
Figure 8 — Installing Rubber Eye Bushing IPS4500)
enough to hold spring leaves in alignment, but not
enough to restrict free movement of leaves.
FRONT SPRING INSTALLATION
(Refer to Fig. 1)
1. On all ser ie s, place rear end of spring in
rear hanger, then install rebound pin, pin retainer,
and pin retainer bolt, or rebound bolt spacer, spacer
bolt, lock washer and nut.
2. Raise front end of spring into frame for­
ward hanger brackets; then install eye bolt, eye
bolt washer, and nut.
3. With dowel pins (when used) tow eye (when
G M C S E R V I C E M A N U A L
used) and caster spacer (when used) on axle pad,
raise axle to springy making sure spring center
bolt or dowel pin engages hole in axle pad.
facing proper direction as shown in figures 2 and
3. If caster spacer is incorrectly installed it will
result in hard steering.
U-bolt spacer, U-bolt and shock absorber (when
used). Install U-bolts and nuts.
pin nuts, U-bolt nuts, rebound pin or bolt nuts, to
torque listed in "Specifications" at end of this
section.
(SEC. 0) of this manual.
repayable. Maintenance requirements involve re­
placement of the rubber mounting grommets, and
tightening all shock absorber pin nuts at regular
intervals. If a shock absorber becomes inoperative,
the complete unit must be replaced.
CAUTION: When replacing shock ab­
sorbers, check the model number stamped
on the unit to make sure it is the same
model as the one removed.
Refer to next page for "Specifications."
Figure 9 — Installed Position of Offset Bushing (PS4500)
NOTE: Install caster spacers with thick edge
4. Install shock absorber bracket, at spring,
5. Tighten front spring eye bolt nut, bracket
6. Lubricate as instructed in LUBRICATION
7. Lower vehicle to floor.
SHOCK ABSORBERS
Shock absorbers are non-adjustable and non­