PREVOST X3-45 2016 Maintenance Manual Download

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Section 13: WHEELS, HUBS & TIRES

PA1593

NOTE

If original bearing unit is re-fitted, and end-float
is measured at 1 mm, with hub not fully
tightened to correct torque [563-687 lb-ft (763-
931 Nm)], 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 Service
Manual NDS Axle Range” found in the OEM
manuals folder.

7.2 HUB BEARING REMOVAL



Stop engine and apply parking brake.



Loosen wheel nuts about one turn (do not

remove the nuts). This is not necessary if
equipped with hydraulic powered gun.



Raise the vehicle by its jacking points on the

body. See Section 18,

"Body",

under

heading

"Vehicle Jacking Points".



Unscrew wheel hex stud nuts (10) and

remove the wheel.



Unscrew hub flange hex cap screws (14).



Remove hub flange and rotor.



Unscrew hub nut and discard.



Remove bearing thrust washer.



Remove unitized hub bearing by hand or

use a puller if necessary.

7.3 HUB BEARING INSTALLATION



Clean spindle using EFX degreaser (Prevost

#685313).



Lubricate part of spindle where bearing will

be located, use Gleitmo 805 grease
(Prevost #685274).



Slide unitized hub bearing over spindle and

position using insertion tool #491115.



Clean thrust washer and hub nut using EFX

degreaser.



Install thrust washer and hub nut then

torque hub nut to [563-687 lb-ft (763-931
Nm)].



Stake the hub nut by deforming with a round

nosed chisel.



Clean hub bearing, rotor and hub flange

clamping surfaces using EFX degreaser.



Install rotor onto hub bearing.



Add some grease (25-50 ml) (Fuchs

Renolite LX PEP-2) (Prevost #685325) into
the bottom of the hub flange cap. Mount hub
flange onto rotor.



Apply some Loctite 243 blue onto cap screw

threads then secure hub flange and rotor to
unitized hub bearing using cap screws (14).
Torque to [161-197 Lb-Ft (218-267 Nm)]
(Refer to figure 3 for tightening sequence).



Mount the wheel over studs, being careful

not to damage stud threads.



Screw in the hex stud nuts (refer to Figure 2

for sequence) so that wheel will position
itself concentrically with hub. This is
important, otherwise wheel may be eccentric
with hub and will not run straight. In this
initial step, slightly tighten the nuts to
correctly position the wheel.



Tighten stud nuts progressively as shown in

Figure 2. The final tightening should be
done with a torque wrench. Tighten stud
nuts to [450 - 500 lbf-ft (610 - 680 Nm)] for
all steel wheel.

8. 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.

8.1 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.