Zf Drive Axle Wheel Hubs; Compact Bearing (Hub Unit) Axial Play Check - PREVOST H3-41 Maintenance Manual

SECTION 13: WHEELS, HUBS AND TIRES
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.
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,
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.
20
PA1621 Maintenance Manual All Series | January 2017
Bearing cups can be
then install outer
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 ( ) is fitted with unitized bearing
FIGURE 27
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
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
AXLE A132 (version with US hub) #5871
207 982 EN.
in Section 24:
INSTRUCTIONS ZF