Freightliner Century Class. Manual — part 17
31–04 Trailer Electrical
Connector Lubrication
In some cases, failure of trailer cables occurs due to
intrusion of chloride-based road deicing chemicals
into the trailer connector. Once inside the connector,
the chloride-based chemicals corrode the brass ter-
minals and create bridging between positive and
ground terminals.
NOTE: The use of soap is not recommended for
cleaning the electrical connector, as some
soaps may increase the corrosion process.
1.
Wash out any existing grease, dirt, and corrosion
on the trailer connectors with electrical contact
cleaner spray.
2.
Grease the trailer connector with a lithium-based
dielectric grease.
31–05 Premier 690 Coupling
Inspection
IMPORTANT: Before servicing the Premier cou-
pling, refer to the Premier web site at
for complete safety,
operation, and maintenance instructions.
WARNING
If at any time the 690 coupling is bound up (jack-
knifed), the 294 bolt MUST be replaced immedi-
ately! Do not use the coupling until the bolt has
been replaced. In addition, carefully inspect the
690 coupling, drawbar, drawbar eye, front end as-
sembly, and tail board for damage. Failure to do
so may result in trailer separation from the truck
while in use, resulting in serious personal injury
or property damage.
The time-in-service of the 294 bolt located in the 690
coupling must be monitored, and maintenance per-
formed as follows. See
For a new or replaced 294 bolt:
• Record the date of installation.
6 months after installation date:
• Remove the 294 bolt. Using dye penetrate or
magnetic particle testing along the length of the
bolt, inspect for fractures.
• If the 294 bolt has no damage, install it and
continue to use for another 6 months.
• If the 294 bolt is fractured, DO NOT USE. Con-
tact Premier Mfg. Co.
1 year after installation date:
• Regardless of service duty, replace the 294 bolt
with a new one.
1
2
3
f310313a
07/13/2010
4
1.
Linch Pin
2.
Handle
3.
Pintle Hook
4.
294 Bolt
Fig. 14, Premier 690 Trailer Coupling
Frame and Frame Components
31
31/10
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 Century Class Trucks 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, refer to the CVSA, Out of
Service (OOS) Criteria, for composite spring assem-
blies, Section 9, Suspension, Pages 44 to 45.
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.
Front and Rear Suspension
Shock Absorber Check
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 Century Class
Trucks 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
Century Class Trucks 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 Century Class
Trucks 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 Century Class
Trucks 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.
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 Century Class Trucks
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
f320465
11/27/95
Fig. 2, Direct-Acting Shock Absorber (front suspension
shown)
Suspension
32
32/2
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст