Section 11: REAR AXLES
PA1553
9
under frame. Remove drive axle wheels (if
required, refer to Section 13, "Wheels, Hubs
And Tires").
2. Exhaust compressed air from the air supply
system by opening the drain cock on each air
reservoir and deplete air bags by moving
leveling valve arm down.
3. Install jacks under tag axle jacking points to
support the axle weight (refer to figure 10).
FIGURE 11: JACKING POINTS ON TAG AXLE 11023
4. Disconnect tag axle lifting chain collars from
lower longitudinal radius rods.
5. Remove the propeller shaft as directed in
Section 9, "Propeller Shaft", in this manual.
6. Disconnect the tag axle brake chamber
hoses.
CAUTION
Position the hoses so they will not be damaged
when removing axle.
7. Disconnect hose from the air spring upper
mounting plate.
8. Remove the two shock absorbers as outlined
in Section 16, "Suspension", under "Shock
Absorber Removal".
9. Disconnect the lower longitudinal radius
rods as outlined in Section 16,
"Suspension", under "Radius Rod Removal".
10. Disconnect the transversal radius rod.
11. Disconnect the upper longitudinal radius rod.
12 Remove the air bellows retaining nuts from
each of the two upper mounting plates.
13. Use the jacks to move the axle forward to
clear the axle off the transmission. Lower the
axle.
CAUTION
On vehicles equipped with an automatic
transmission (with or without the output
retarder), move tag assembly very carefully.
Pay special attention to the U-shaped section,
as the transmission end components may be
easily damaged through a false maneuver.
14. Reverse removal procedure to reinstall tag
axle.
NOTE
Refer to Section 16, "Suspension", for proper
torque tightening of suspension components.
NOTE
Refer to section 13 "Wheels, Hubs And Tires"
for correct wheel bearing adjustment procedure.
2.5 TAG AXLE ALIGNMENT
The tag axle alignment consists in aligning the
tag axle parallel to the drive axle position. Before
aligning the tag axle, proceed with the drive axle
alignment (paragraph 1.11). Tag axle alignment
is achieved with the use of shims inserted
between the lower longitudinal radius rod
supports and axle. Tag axle alignment is factory
set and is not subject to any change, except if
vehicle has been damaged by an accident or if
there are requirements for parts replacement.
CAUTION
If this setting is altered significantly, it will
cause excessive tire wear.
NOTE
It may be necessary to adjust the axle TOE as
well as its alignment. In this case, insert shims
(7 min. - P/N 121203 or 15 min. - P/N 121240)
in between mounting plate and spindle, as
required.
If axle has been removed for repair or servicing
and if all parts are reinstalled exactly in their
previous locations, axle alignment is not
necessary. However, if the suspension supports
have been replaced or have changed position,
proceed with the following instructions to verify
or adjust the tag axle alignment.
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