when inflated. If the clearance is less than 1 inch (25
mm), relocate the obstructing parts.
CAUTION
Failure to relocate obstructing parts could result
in damage to the air spring.
Freightliner AirLiner Component
Inspecting and Operation Checking
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 resulting in property damage, serious per-
sonal injury or death.
1. Chock the front tires. Raise the rear of the ve-
hicle so the tires just clear the ground and 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
Business
Class
®
Trucks Service Manual
.
3. Inspect each air spring for wear at its connection
to its pedestal. Replace any worn air springs; for
instructions, see Group 32 of the
Business
Class
®
Trucks Service 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
Business Class
®
Trucks Service 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
Business Class
®
Trucks Service 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
Busi-
ness Class
®
Trucks Service Manual
for possible
causes and corrections.
Freightliner AirLiner Control Rod
Checking
1. Without disconnecting the control rods, attempt
to move (by hand) each of the control rod ends
up, down, in, and out. If there is any movement,
examine the control rods for wear or damage.
Replace 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.
NOTE: The Freightliner AirLiner Suspension is
manufactured at numerous weight ratings up to
46,000 pounds. The control rod on the 46,000-
pound-rated suspension is larger, and is fas-
tened differently than on other applications; see
Group 32of the
Business Class
®
Trucks Service
Manual
for removal and installation information.
f320023a
05/27/93
1
2
3
4
5
A
A. 1/8 inch (3 mm) Clearance
1. Frame Fasteners
2. Frame Rail
3. Pry Bar
4. Equalizer
5. Equalizer Bracket
Fig. 4, Top View of the Equalizer
Suspension 32
Business Class Trucks Maintenance Manual, July 1999 32/3
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