freightliner 122SD, Maintenance Manual

Page: 68 / 132

of a pry bar may lead to premature bushing re-
placement.
4. Lift the rear of the vehicle and support the frame
on jack stands to unload the suspension compo-
nents. The vehicle is lifted high enough when the
beam ends are off of the saddles.
Inspect the walking beam for cracks or other
damage. If damage is found, replace the walking
beam.
Keep the vehicle supported by the jack stands
for the next operation.
5. Manipulate the walking beam so that a microm-
eter, vernier, or dial caliper can be used to deter-
mine the wear area thickness on the bottom
face. See
Fig. 7. Measurements should be taken
a minimum of 1/2 inch from the beam flange
edges to eliminate any edge wear that may have
occurred. Subtract the wear area thickness (see
Fig. 7 , Ref. B) from the thickness at the non-
wear area (see Fig. 7 , Ref. A) to determine the
amount of wear.
If the beams show any wear greater than 0.062
inch (1.5 mm), a Chalmers wear plate must be
installed, or the walking beam must be replaced.
6. Rotate the restrictor cans 360 degrees and in-
spect the cans for cracks, severe corrosion, and
distortion. If any of these conditions are present,
or the restrictor can is missing, replace the re-
strictor can.
WARNING
Replace all cracked or missing restrictor cans.
Failure to do so could lead to loss of vehicle con-
trol, which could result in property damage, seri-
ous personal injury, or death.
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 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 old grease is forced out from the
cap-and-tube assembly; see
Fig. 8 .
Hendrickson
The Hendrickson RS Series suspension does not
require lubrication.
09/27/95 f320432
1
A
B
A. Non-Wear Area B. Wear Area
1. Walking Beam
Fig. 7, Walking Beam End Wear Thickness
Suspension
32
122SD and Coronado 132 Maintenance Manual, February 2016
32/5