Freightliner Century Class. Manual — part 19
and loss of vehicle control. This could result in
serious personal injury or property damage.
4.
Inspect the cam surface of the number-two
spring hanger for wear due to operating mileage.
Also, inspect the outside legs for wear, which
can be caused by worn spring eye bushings.
NOTE: RTE2 (extended-leaf-spring) suspen-
sions require a minimum gap of 3/8 inch (9.5
mm) between the cam surface of the number-
two spring hanger and the top of the main leaf
in the unloaded condition. See
. If this
gap is less than 3/8 inch (9.5 mm), the
extended-leaf portion of the spring will not per-
form satisfactorily for an empty ride.
5.
Inspect the cam surface on the number-three
spring hanger (extended-leaf-springs only) for
wear. Excessive wear will reduce the gap avail-
able at the number-two spring hanger. See the
previous note.
6.
Place a block of wood on the leaf spring. See
. Place a pry bar on the block of wood
and insert the end of the pry bar under the frame
hanger. Attempt to lift the frame hanger, as
shown in
. Also, with an empty chassis
and the brakes applied, attempt to rock the chas-
sis back and forth while observing the spring
eye. In either case, if 1/8 inch or more of move-
ment is observed, the bushing and pin should be
replaced. This also could indicate that a broken
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1.
Rust Inspection Area
Fig. 11, Hendrickson RS Series Rust Inspection
f320112a
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1
2
3
4
A
A. Minimum gap of 3/8" (9.5 mm).
1.
Forward (no. 1) Spring Hanger
2.
Spring Eye Pin
3.
Rear (no. 2) Spring Hanger
4.
Rear (no. 3) Extension
Fig. 12, RTE Suspension (unloaded)
1
2
3
4
f320422
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1.
Frame Bracket
2.
Leaf Spring
3.
Wood Block
4.
Pry Bar
Fig. 13, Hendrickson RT2 and RTE2 Series Frame
Bracket Inspection
Suspension
32
32/7
spring eye and spring are connected to the
spring hanger through the wrapper eye of the
second leaf. In this case, the main leaf or the
complete spring should be replaced immediately.
Neway Suspension
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 or death,
or property damage.
1.
Park the vehicle on a level surface. Apply the
parking brakes and chock the tires.
2.
Inspect the rear suspension for any signs of
damage, loose components, wear, or cracks. Re-
place any damaged components to prevent fail-
ure or equipment breakdown.
3.
Inspect all bolts and nuts at the pivot and axle
connections to ensure they are properly torqued.
Check all other nuts and bolts for proper torque.
See
of this manual for proper torque
specifications.
4.
Check the air pressure gauge to confirm that
there is in excess of 65 psi (448 kPa) in the air
system, and inspect the air springs for sufficient
and equal firmness.
NOTE: Height control valves control all air
springs. Check for air leaks by applying a soapy
solution, then checking for bubbles, at all air
connections and fittings.
5.
Check the riding height of the air suspension by
measuring the distance from the centerline of the
rear axle (see
) to the bottom of the frame
rail. If the riding height is incorrect, adjust the air
suspension.
Reyco
Check all suspension fasteners for the proper torque
values. See
of this manual for proper bolt
torque specifications. Inspect the frame for elongated
holes at the suspension mounting points, and have
the frame repaired as needed. If elongated holes are
found on the frame, check the suspension alignment.
32–02 Suspension Lubrication
Front Suspension
Wipe all dirt away from the grease fittings (if
equipped) on the spring-eye bushings. Apply multi-
purpose chassis grease with a pressurized grease
gun until the old grease is forced out.
NOTE: Service Schedule IV vehicles equipped
with a 12,000 lb (5452 kg) front axle are fitted
with maintenance-free rubber bushings, and do
not require lubrication.
Rear Suspension
Chalmers
No lubrication is required on the Chalmers rear
suspension.
Freightliner Spring
Single Axle
No lubrication is required on Freightliner single-axle
rear suspensions.
Tandem Axle
Lubricate the equalizer cap-and-tube assembly bush-
ings by applying multipurpose chassis grease at the
grease fitting until the old grease is forced out from
the cap-and-tube assembly. See
Hendrickson
The Hendrickson RS Series suspension does not
require lubrication.
For Hendrickson RT2 and RTE2 Series, lubricate the
bronze, ball-indented bushings in the spring eye, as
follows:
1.
Park the vehicle on a level surface, apply the
parking brakes, and chock the front tires.
2.
Raise the rear of the vehicle until the rear wheels
are suspended in the air, then support the ve-
hicle with safety stands. This relieves the load on
the bushings and pins to allow the proper flow of
lubricant around them.
3.
Use a multipurpose chassis grease and lubricate
the bronze, ball-indented bushings in the spring
eyes at the grease fitting. See
. Continue
Suspension
32
32/8
to lubricate until grease exits both ends of the
bushing. If the pin will not accept lubricant, re-
move the pin and clean the lubrication channels
where lubricant may have hardened. Remove the
safety stands and lower the vehicle after lubrica-
tion is complete.
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4
3
2
1.
Frame Rail
2.
Axle Housing
3.
Axle Centerline
4.
Suspension Ride Height
Fig. 14, Neway Ride Height Inspection
320020a
05/27/93
1
1
A
A. Lubricate here.
1.
Cap-and-Tube Assembly Bushing
Fig. 15, Equalizer Assembly Lubrication
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f320424
1
2
2
3
4
4
1.
Bronze Bushing
2.
Lubrication Hole
3.
Grease Fitting
4.
Lubrication Groove
Fig. 16, Hendrickson RT2 and RTE2 Series Bushing
Lubrication
Suspension
32
32/9
Neway
No lubrication is required on Neway rear suspen-
sions.
Reyco
No lubrication is required on Reyco rear suspen-
sions.
32–03 Suspension U-Bolt
Torque Check
CAUTION
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 brakes. Chock the tires to prevent the
vehicle from moving.
2.
Check the U-bolt high nut torque in a diagonal
pattern. Set a click-type torque wrench to the
highest torque value for the fastener being
checked. See
for U-bolt torque specifica-
tions. Turn the wrench in a clockwise motion
(looking up) until the torque wrench clicks.
Remove the chocks.
Spring Assembly U-Bolt High Nut Torque Values
*
Size
Torque: lbf·ft (N·m)
5/8–18
Stage 1: Hand Tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 180 to 230 (245 to 313)
3/4–16
Stage 1: Hand Tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 270 to 330 (367 to 449)
7/8–14
Stage 1: Hand Tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 420 to 500 (571 to 680)
Spring Assembly U-Bolt High Nut Torque Values
*
Size
Torque: lbf·ft (N·m)
1–14
Stage 1: Hand tighten
Stage 2: 60 (81)
Stage 3: 200 (271)
Stage 4: 520 to 600 (707 to 816)
*
Tighten in a diagonal pattern as shown in
Table 1, Spring Assembly U-Bolt High Nut Torque
Values
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2
3
4
Fig. 17, Tightening Pattern for U-Bolt High Nuts
Suspension
32
32/10
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