fully inflated, see Group 32 of the
School Bus
Chassis Workshop Manual
.
3.
Inspect each air spring for wear at the connec-
tion to the pedestal. Replace any worn air
springs; for instructions, see Group 32 of the
School Bus Chassis Workshop Manual
.
4.
Check the axle connection welds (beam-seat to
equalizing-beam) and axle-adapter to axle for
cracks. If welds are cracked, grind them out and
reweld the parts.
5.
Move the axle up and down while checking for
signs of looseness due to worn parts at the front
pivot connections. Replace any worn parts by
following the procedures in Group 32 of the
School Bus Chassis Workshop Manual
.
6.
Inspect the shock absorbers for oil leaks and
worn rubber bushings. Replace the shock ab-
sorbers and/or rubber bushings if wear or dam-
age is noted. For instructions, see Group 32 of
the
School Bus Chassis Workshop Manual
.
7.
Remove the safety stands and lower the rear of
the vehicle to the ground. Run the engine until
air pressure of at least 100 psi (689 kPa) is
maintained throughout the system.
8.
Check that all air springs are inflated. If the air
springs do not inflate, see Group 32 of the
School Bus Chassis Workshop Manual
for pos-
sible causes and corrections.
32–08 U-Bolt Torque Checking,
Freightliner AirLiner
In a diagonal pattern, tighten all 5/8–18 U-bolt nuts
205 lbf·ft (278 N·m); tighten all 3/4–16 U-bolt nuts
300 lbf·ft (407 N·m); and tighten all 7/8–14 U-bolt
nuts 460 lbf·ft (624 N·m).
CAUTION
Failure to retorque the U-bolt nuts could result in
spring breakage and abnormal tire wear.
32–09 Shock Absorber
Checking, Freightliner
Spring
Make sure that the shock absorber brackets are
tight, and that the shock absorber is not striking or
rubbing on the frame or some other part of the chas-
sis. See
. Check the rubber mounting bushings
and replace if worn. Inspect the shock absorber for
oil leakage.
If the shock absorber is worn or damaged, replace it
with a new one.
32–10 Radius Rod Bushing
Checking, Hendrickson
1.
Without detaching the radius rods, attempt to
move (by hand) each of the radius-rod ends up,
down, in, and out. If there is any movement, re-
place the radius rod.
f320267a
10/05/94
1
2
3
1.
Upper Mounting Bracket
2.
Shock Absorber
3.
Lower Mounting Bracket
Fig. 2, Shock Absorber Installation (front suspension
shown)
Suspension
32
School Bus Chassis Maintenance Manual, March 2003
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