Freightliner Coronado 132 / 122SD. Manual — part 15
Title of Maintenance Operation (MOP)
MOP Number
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–00
Suspension Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–01
Suspension Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–02
Suspension U-Bolt Torque Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–03
Suspension
32
Index, Alphabetical
32–00 Safety Precautions
Safety Precautions in this section apply to all
procedures within this group.
DANGER
When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.
32–01 Suspension Inspection
Front Suspension Check
WARNING
Do not replace individual leaves of a damaged leaf
spring assembly; replace the complete spring as-
sembly. Visible damage (cracks or breaks) to one
leaf causes hidden damage to other leaves. Re-
placement of only the visibly damaged part(s) is
no assurance that the spring is safe. On front
spring assemblies, if cracks or breaks exist in the
two top leaves, a loss of vehicle control could
occur. Failure to replace a damaged spring assem-
bly could cause an accident resulting in property
damage, serious personal injury, or death.
Inspect the front spring assemblies for cracked, bro-
ken, or abnormally bent leaves. If any of these condi-
tions exist, replace the spring assembly. See Group
32 of the 122SD and Coronado Workshop Manual
for instructions.
Composite Springs
The Commercial Vehicle Safety Alliance (CVSA) de-
fines a crack that causes out-of-service conditions for
composite spring assemblies, as a separation in any
axis, which passes completely through the composite
spring material.
For additional information on composite spring as-
semblies, refer to the CVSA, Out of Service (OOS)
Criteria.
Inspect the Liteflex spring for cracks that result in an
out-of-service condition as follows (see
• a side to side crack extending beyond 3/4 of the
length of the spring;
• a top to bottom crack extending beyond 3/4 of
the length of the spring;
• intersecting cracks of any length.
The Liteflex composite spring should also be re-
moved from service if splintering has occured to the
point where noticeable vehicle ride height loss has
occurred.
Shock Absorber Check, Front
and Rear Suspensions
Make sure the shock absorber brackets are tight,
and the shock absorber is not striking or rubbing the
frame or some other part of the chassis. Striking or
rubbing the frame is characterized by chafe marks on
the shock absorber body and the frame rail. See
. Check the rubber mounting bushings for cracks,
cuts, swelling, and dry rot. Also, check the bushings
for missing pieces. Replace the bushings as needed.
08/14/2008
f321135
A
B
C
A. Side to side crack extending beyond 3/4 of the
length of the spring
B. Top to bottom crack extending beyond 3/4 of the
length of the spring
C. Intersecting cracks of any length
Fig. 1, Out-of-Service Conditions, Composite Spring
Suspension
32
32/1
Inspect the shock absorber for oil leakage. If the
shock absorber is damaged or leaking, replace it with
a new one. See Group 32 of the 122SD and Coro-
nado Workshop Manual for replacement instructions.
Rear Suspension Check
Freightliner Spring Suspension
WARNING
Do not replace individual leaves of a damaged leaf
spring assembly; replace the complete spring as-
sembly. Visible damage (cracks or breaks) to one
leaf causes hidden damage to other leaves. Re-
placement of only visibly damaged parts is no as-
surance that the spring is safe. Failure to replace
a damaged spring assembly could cause an acci-
dent, resulting in serious personal injury or prop-
erty damage.
Replace worn, cracked, or damaged spring
brackets. Failure to do so could result in bracket
breakage, possibly leading to loss of vehicle con-
trol and resulting in personal injury or property
damage.
1.
Inspect the forward and rear spring brackets and
equalizer brackets for wear, cracks, and other
damage. If any of these conditions exist, replace
the damaged bracket(s). See Group 32 of the
122SD and Coronado Workshop Manual for in-
structions.
2.
Inspect the tandem-axle frame crossmember and
gussets for wear, cracks, and other damage. If
any of these conditions exist, replace the dam-
aged parts. See Group 32 of the 122SD and
Coronado Workshop Manual for instructions.
NOTICE
Failure to replace the suspension crossmember or
gussets if they are cracked, worn, or otherwise
damaged could result in damage to the vehicle
chassis.
3.
Without detaching the torque arms, attempt to
move (by hand) each radius-rod end up, down,
in, and out. If there is any movement, replace the
torque arm. If a torque arm needs to be re-
placed, see Group 32 of the 122SD and Coro-
nado Workshop Manual for instructions.
4.
Inspect the weld seams between the torque arm
tube and the shorter bushing tubes. If there are
cracks, replace the torque arm. Do not weld the
torque arm for any reason.
5.
Inspect the rubber bushing ends. See
. Re-
place the torque arm for any of the following rea-
sons:
• if there are gaps between the rubber bush-
ing and the pin or outer steel sleeve;
• if either bushing end contacts a torque arm
pin mounting bolt;
• if there are cracks in the bushing;
• if part of the rubber bushing extends be-
yond the outer circumference of the outer
bushing sleeve.
f320465
11/27/95
Fig. 2, Direct-Acting Shock Absorber (front suspension
shown)
f320021a
05/27/93
Fig. 3, Torque Arm Bushings
Suspension
32
32/2
6.
Block up the frame enough to take chassis
weight off the springs. Attempt to move the
equalizer up and down, using a pry bar between
the top of the equalizer and top of the equalizer
bracket; apply hand pressure only. See
. If
movement at the center of the equalizer exceeds
1/8 inch (3 mm), replace the equalizer bushings.
See Group 32 of the 122SD and Coronado
Workshop Manual for instructions.
7.
With the vehicle unloaded, attempt to move the
equalizer side to side, using a pry bar between
the equalizer and frame rail. Apply hand pressure
only. See
. If clearance between the equal-
izer assembly and any frame component or fas-
tener is less than 1/8 inch (3 mm), replace the
equalizer bushings. See Group 32 of the 122SD
and Coronado Workshop Manual for instructions.
Freightliner AirLiner Suspension
WARNING
Do not replace individual leaves of a damaged leaf
spring assembly; replace the complete spring as-
sembly. Visible damage (cracks or breaks) to one
leaf causes hidden damage to other leaves. Re-
placement of only the visibly damaged part(s) is
no assurance that the spring is safe. On front
spring assemblies, if cracks or breaks exist in the
two top leaves, a loss of vehicle control could
occur. Failure to replace a damaged spring assem-
bly could cause an accident resulting in property
damage, serious personal injury, or death.
Inspect the forward and rear spring brackets for
wear, cracks, and other damage. If any of these con-
ditions exist, replace the damaged bracket(s). See
Group 32 of the 122SD and Coronado Workshop
Manual for instructions.
WARNING
Replace worn, cracked, or damaged spring
brackets. Failure to do so could result in bracket
breakage, possibly leading to loss of vehicle con-
trol and resulting in personal injury or property
damage.
Inspect the crossmember(s) and gussets for wear,
cracks, and other damage. If any of these conditions
exist, replace the damaged parts. See Group 32 of
the 122SD and Coronado Workshop Manual for
instructions.
Visually check the air spring piston for cracks, chips,
and broken areas. Check the air bag for rips, tears,
and holes. Verify that the air spring assembly does
not leak. If any of these conditions exist, replace the
damaged parts. See Group 32 of the 122SD and
Coronado Workshop Manual for instructions.
IMPORTANT: Before checking the AirLiner sus-
pension height, make sure there is no load on
the chassis, and the trailer is unhitched.
f320022a
05/27/93
1
2
3
A
A. Measure the change in gap at this point.
1.
Equalizer Bracket
2.
Equalizer
3.
Pry Bar
Fig. 4, Side View of the Equalizer
f320023a
05/27/93
1
2
3
4
5
A
A. 1/8" (3 mm) Clearance
1.
Frame Fasteners
2.
Frame Rail
3.
Pry Bar
4.
Equalizer
5.
Equalizer Bracket
Fig. 5, Top View of the Equalizer
Suspension
32
32/3
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