SECTION 13: WHEELS, HUBS AND TIRES
20
PA1621 Maintenance Manual All Series | January 2017
No. 23A" annexed to Section 11 of this
manual.
2. Remove wheels and tires.
NOTE
It is good practice to mark position of the
wheel on the axle before removal and replace
wheel at the same position during
reinstallation.
3. Remove lock nut, lock ring and adjusting nut
from axle housing to prevent the outer
bearing from falling out. Remove outer
bearing cone and roller assembly.
4. Remove screws attaching inner oil seal
retainer to hub, and remove inner oil seal
assembly. Remove inner bearing cone and
roller assembly. Bearing cups can be
separated from the hub using a hammer and
a long brass drift.
5. Thoroughly clean all parts. Bearing cone and
roller assemblies can be cleaned in a
suitable cleaning solvent using a stiff brush to
remove old lubricant.
6. In case that excessive wear, deterioration,
cracking or pitting is present on the bearing
cups, rollers or cones, the bearings should
be replaced. Seals should be replaced each
time they are removed from the hub. To
install new oil seal, use a suitable adapter
and drive the seal into the retainer bore until
it bottoms.
7. When installing wheel on spindle, center the
wheel hub with spindle to avoid damaging
the seal with the end of the spindle. Push
wheel straight over the spindle until inside
diameter of seal press fits on wiper ring. Fill
hub cavity with general-purpose gear
lubricant (refer to Section 24 "Lubrication" for
proper oil grade selection). Lubricate, then
install outer bearing cone. Adjust bearing and
lock.
8. Assemble axle flange to axle using a new
gasket. Apply sealant in stud area. After both
wheels have been assembled according to
above procedure, fill the differential with the
recommended lubricant to the proper factory
recommended level.
FIGURE 26: AXLE FLANGE TIGHTENING SEQUENCE
NOTE
During regular inspection, do not forget to
check lubricant level in differential. Clean
thoroughly or replace vent as required.
12. ZF DRIVE AXLE WHEEL HUBS
The ZF A132 hypoid single reduction drive axle
hub (
FIGURE 27) is fitted with unitized bearing
known as compact bearing in ZF’s literature.
12.1 COMPACT BEARING (HUB UNIT) AXIAL
PLAY CHECK
Check the compact bearing (hub unit) axial play
at the intervals specified by the Lubrication And
Servicing Schedule in Section 24:
LUBRICATION & SERVICING. Furthermore, the
bearing must be checked in case of brake disk
change, ABS fault message and rising noise
level at increasing speed.
Perform compact bearing (hub unit) axial play
check as described in paragraph 6.2 HOW TO
CHECK THE AXIAL PLAY of the following
manual: OPERATING INSTRUCTIONS ZF
AXLE A132 (version with US hub) #5871
207 982 EN.
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