Freightliner Business Class M2. Manual — part 16
2.
Grease the trailer connector with a lithium-based
dielectric grease.
09/06/2001
f310885
1
2
3
1.
Pivot
2.
Cam Track
3.
Cam Plate
Fig. 7, Holland Fifth Wheel Cam Plate
Frame and Frame Components
31
Business Class M2 Maintenance Manual, March 2016
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Title of Maintenance Operation (MOP)
MOP Number
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–00
Suspension Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–01
Suspension Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–02
Suspension U-Bolt Torque Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–03
Suspension
32
Index, Alphabetical
Business Class M2 Maintenance Manual, August 2015
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 Inspecting
Freightliner Spring Front and
Rear Suspension Spring
Assemblies Inspection
Inspect the front and rear suspension spring assem-
blies for pitted, cracked, broken, or abnormally bent
leaves, and extreme rust. If any of these conditions
exist, replace the spring assembly. See Group 32 of
the Business Class® M2 Workshop Manual for
instructions.
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.
IMPORTANT: On multi-leaf suspensions, closely
inspect each component of the leaf spring as-
semblies, including the brackets, U-bolts, and
related parts.
Freightliner Spring Rear
Suspension Spring Brackets and
Equalizer Brackets (Tandems)
Inspection
Inspect the forward and rear spring brackets, equal-
izer brackets (tandems), and the wear pads, for
wear, cracks, and other damage. If any of these con-
ditions exist, replace the damaged bracket(s) and
wear pad(s). See Group 32 of the Business Class®
M2 Workshop Manual for instructions.
WARNING
Failure to replace the forward spring brackets,
equalizer brackets, or rear spring brackets if they
are worn, cracked, or otherwise damaged could
result in progressive damage to and eventual
breakage of the bracket. This could cause a loss
of vehicle control resulting in property damage,
serious personal injury or death.
Freightliner Spring Tandem Axle
Suspension Crossmember and
Gussets Inspection
Inspect the tandem-axle frame crossmember and
gussets for wear, cracks, and other damage. If any of
these conditions exist, replace the damaged parts.
See Section 31.00, Subject 130, of the Business
Class® M2 Workshop Manual for instructions. Check
all fasteners for tightness. See
of this
manual for torque values.
CAUTION
Failure to replace the suspension crossmember or
gussets if they are cracked, worn, or otherwise
damaged could result in damage to the vehicle
chassis.
Freightliner Spring Shock
Absorber Check
NOTE: Shock absorbers are optional on spring
suspensions.
Make sure that the shock absorber brackets are tight
and that the shock absorber is not striking or rubbing
Suspension
32
Business Class M2 Maintenance Manual, August 2015
32/1
on the frame or some other part of the chassis.
Check the rubber mounting bushings and replace if
worn. Inspect the shock absorber for oil leakage,
which is defined as being drips of oil on the sides of
the shock absorber.
If the shock absorber is worn or damaged, replace it
with a new one.
Freightliner 23K, 26K, 30K
Spring Single and Tandem
Radius Rod Bushing Check
1.
Without detaching the torque arms, use your
hand to attempt to move each of the radius rod
ends up, down, in, and out. If there is any move-
ment, replace the torque arm.
2.
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.
3.
Inspect the rubber bushing ends. See
. Re-
place the torque arm for any of the following rea-
sons:
• There are gaps between the rubber bush-
ing and the pin or the outer steel sleeve.
• Either bushing end contacts a torque arm
pin mounting bolt.
• There are cracks in the bushing.
• Part of the rubber bushing extends beyond
the outside diameter of the outer bushing
sleeve.
Freightliner Spring Tandem
Suspension Equalizer Bushing
Check
1.
Block the frame up enough to take the weight of
the chassis off of the springs. Attempt to move
the equalizer up and down, by using a pry bar
between the top of the equalizer and the 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.
2.
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.
52-Inch Multi-leaf Spring
Component Check
No lubrication is required on the 52-inch multi-leaf
spring rear suspension.
Inspect the stabilizer bar, if present, for irregular
bushing wear or cracks in the brackets. Check the
rubber helper spring, if present, for cracks.
f320021a
05/27/93
Fig. 1, Torque Arm Bushings
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. 2, Side View of the Equalizer
Suspension
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