SPRINGS, SHOCK ABSORBERS
Figure 5 - Progressive Spring Assembly
For lubrication intervals, refer to Operators Manual. For
LUBRICATION section CTS-4033.
Retightening U-Bolt Nuts
U-bolt nuts must be retightened at the intervals listed
below. This applies to both new vehicles and to vehicles
on which spring service has been performed.
The U-bolt nuts must be retightened after the
vehicle has operated under load for 1 600
whichever occurs first.
Thereafter, the spring U-bolt nuts should be
retightened every 58,000 kilometers (36,000
TORQUE VALUES OF 40% OF THE SPECIFICATIONS
WOULD ASSURE JOINT INTEGRITY, PROVIDED THE
CONDITION. HOWEVER, ALWAYS TIGHTEN TO
ORIGINAL SPECIFICATIONS. RUSTY JOINTS MUST
BE DISASSEMBLED, CLEANED AND LUBRICATED
TO ASSURE A LIKE-NEW CONDITION PRIOR TO
Although the exact servicing procedures are different
for each type of spring assembly and application, the
basic procedures are similar. The following is a general
outline for servicing all spring assemblies.
Place floor jack under truck frame and raise
truck sufficiently to relieve weight from spring to
Remove shock absorbers where used.
Remove U-bolts, spring bumper and retainer or
equipped with rubber bushings).
Remove nuts from spring shackle pins or
Slide spring off bracket pin and shackle pin.
Clamp spring end in vise and remove old
bushing from spring eye.
Reposition spring in vise so that assembly will be
clamped near center.
If bolted-type rebound clips are used, remove
nuts, bolts and spacers. Where clinch type
rebound clips are used, bend tabs of clips up,
being careful not to break them. Heating clips
with torch will help avoid breakage.
Remove nut from spring center bolt.
Release vise to permit spring leaves to separate.
Remove spring from vise and separate leaves
from center bolt.
Cleaning, Inspection and Repair
Wash all parts in cleaning solvent or use steam
cleaning equipment to remove grease and scale.
Use a wire brush to hasten dirt removal.
Do not immerse rubber spring bushings in
cleaning solvent. Use a non-petroleum base
type rubber lubricant on a clean cloth to wipe
these parts clean.
Inspect all spring leaves for breakage and
cracks. Also compare arch of leaves with new
leaves. If leaves are flattened out, replace.
Spring pins must be replaced if they are worn,
corroded or cracked.
Spring eye bushing and spring shackle bushing
must also be replaced if defective.
Check spring brackets for cracks or for wear
around mounting bolt or rivet holes. Replace
bracket if damaged.
6. Always use new center bolts at each overhaul.