Section 13: WHEELS, HUBS & TIRES
PA1553
7
NOTE
If original bearing unit is re-fitted, and end-float
is measured at 1 mm, with hub not fully
tightened to correct torque, then the retaining
clip within the unit is damaged and a new unit
must be fitted.
NOTE
For more information on front and tag axle
wheel hub, refer to “DANA SPICER
Maintenance Manual Model NDS and
Maintenance Manual NDS Axles” annexed at
the end of Section 11 and to Section 16
"Suspension".
9. DRIVE AXLE WHEEL HUBS
Drive wheels use a single oil-seal assembly.
They are lubricated from the oil supply in the
differential housing. Bearings are tapered rollers,
adjustable to compensate wear. Maintain
differential oil level with general-purpose gear
lubricant (refer to Section 24 "Lubrication" for
proper oil grade selection) to ensure adequate
oil supply to wheel bearings at all times.
9.1 BEARING ADJUSTMENT
To adjust drive wheel bearings:
1. Raise vehicle until both dual wheels can be
turned freely (approximately 6 inches from
the ground). Position jack stands under drive
axle, then lower vehicle approximately 2
inches in order to avoid entire weight of the
axle being supported by the suspension air
bellows and the shock absorber pins.
2. Remove axle shaft as indicated in "Meritor -
Maintenance Manual No. 5" under heading
"Single Reduction Differential Carriers"
annexed to "Section 11" of this manual.
Remove gaskets. Unscrew lock nut and
remove adjusting nut lock ring.
3. To adjust, tighten adjusting nut until the
wheel binds. Rotate the wheel while tighten-
ing so that all surfaces are in proper contact.
Back off adjusting nut approximately, ¼ to
1/3 turn to assure 0.001/0.007"
(0.0254/0.1778 mm) endplay and to ensure
that wheel turns freely. Replace the lock ring,
and adjust nut dowel pin in one of the holes.
The ring may be turned over if necessary to
allow more accurate bearing adjustment.
4. Tighten lock nut and check bearing
adjustment. Replace the axle shaft using a
new gasket.
9.2 DISASSEMBLY AND REPAIR
1. Jack vehicle as per “Bearing Adjustment" and
remove axle shaft as indicated in "Meritor -
Maintenance Manual No. 5" entitled "Single
Reduction Differential Carriers" annexed to
Section 11 of this manual.
2. Remove wheels and tires.
CAUTION
To replace wheel at the same location, always
mark position of the wheel on the axle before
removal, thus avoiding a new wheel
balancing.
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 sepa-
rated 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 suit-
able 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.
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