GMC 4000 Series Service Manual page 153

Sec. 4B
Page 146
REAR SPRINGS AND SUSPENSION
Remove rear wheels to provide access to spring
assem bly.
2. Safely support axle on floor jack.
3. Install a C-clamp on radius leaf as shown
in figure 3, to relieve load on radius leaf eye bolt
on 4000 and PS4500 Series vehicles.
4. On 4000 and PS4500 Series (fig. 1), at front
and rear hanger, remove rebound pin retainer
bolt, then remove retainer. Install suitable puller
Figure 3 — U sin g C -C lam p at Radius Leaf
G M C S E R V I C E M A N U A L
AUXILIARY SPRING
ASSEMBLY
Figure 2 — Rear Springs Installed (Typical for " £ " and "S" Models)
into tapped hole at end of rebound pin, then remove
pin.
5. On "E," and "S" Series, remove rebound
bolt nut and washer, then remove rebound bolt
(fig. 2).
6. Remove spring U-bolt nuts, shock absorber
bracket (when used) U-bolt anchor plate and U-
bolts and U-bolt spacer, then lower axle slightly.
7. Remove spring eye or radius bolt nut and
washer, then remove spring eye bolt from spring
eye or radius leaf.
NOTE: When tapered shim is used, the posi­
tion of shim thin and thick edge should be noted so
that shim can be installed properly at assembly.
8. Inspect spring. Replace bushing, repair or
replace spring unit as outlined later in this section.
SPRING LEAF REPLACEMENT
NOTE: Auxiliary springs should be disassem ­
bled in an arbor p ress. When assembling springs,
make sure spacer is installed between the auxil­
iary and main spring.
1. Mark one side of spring assembly to assure
original position of springs when assembling.
2. Place spring in a vise and remove spring
clip, bolt, nut, and spacer.
3. File peened end of center bolt and remove
center bolt nut.