freightliner Custom Classic MT45 2022 Maintenance Manual page 65

Suspension
AirLiner Control Rod Check
1. Without disconnecting the control rods, use your
hand to attempt to move each of the control rod
ends up, down, in, and out. If there is any move-
ment, examine the control rods for wear or dam-
age. Replace the control rod(s) if necessary.
2. Inspect the rubber bushings for cracks or cuts.
3. Check for any shifting of the barpin.
4. Check for cracks in the metal components and
welds.
32–03 Component Inspecting
and Operation Checking,
Freightliner AirLiner
WARNING
Inspect the components and check their operation
as described below. Failure to perform these in-
spections and checks could result in separation of
worn suspension components and loss of vehicle
control, possibly causing personal injury and
property damage.
1. Chock the front tires. Raise the rear of the ve-
hicle so that the tires just clear the ground and
so that the suspension is fully extended. Place
safety stands under the vehicle frame.
2. Squeeze all air springs to check for complete
deflation. If any air springs remain partially or
fully inflated, see Group 32 of the Walk-In Van
Chassis Workshop Manual, or take the vehicle to
an authorized Freightliner dealer.
3. Inspect each air spring for wear at its connection
to the pedestal. Replace any worn air springs; for
instructions, see Group 32 of the Walk-In Van
Chassis Workshop Manual, or take the vehicle to
an authorized Freightliner dealer.
4. Check the axle connection welds (beam-seat to
equalizing-beam) and axle-adapter to axle for
cracks. If welds are cracked, take the vehicle to
an authorized Freightliner dealer for repair.
Walk-In Van Chassis Maintenance Manual, July 2015
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
Walk-In Van Chassis Workshop Manual, or take
the vehicle to an authorized Freightliner dealer.
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 Walk-In Van Chassis Workshop Manual, or
take the vehicle to an authorized Freightliner
dealer.
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
Walk-In Van Chassis Workshop Manual for pos-
sible causes and corrections, or take the vehicle
to an authorized Freightliner dealer.
32–04 Suspension U-Bolt
Torque Checking
Check the U-bolt torque of both the front and rear
axles where applicable.
NOTICE
Failure to retorque the U-bolt nuts could result in
spring breakage and abnormal tire wear.
1. Park the vehicle on a flat surface and apply the
parking brake. Chock the tires.
2. Check the U-bolt torque in a diagonal pattern.
Set a click-type torque wrench to the highest
torque value for the fastener being checked. See
Table 1 for U-bolt torque specifications. Turn the
wrench in a clockwise motion (looking up) until
the torque wrench clicks.
3. Remove the chocks.
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