NHTSA ID Number: 10201835
Manufacturer Communication Number: Mi21-07A
TSB/Document Date: 2021-10-04
Summary
RONT & TAG AXLE – UNITIZED HUB BEARING END PLAY VERIFICATION AND REPLACEMENT
MAINTENANCE
INFORMATION
Revision: A
MI21-07A
DATE :
September 2021
SECTION : 13 WHEEL, HUB &
TIRES
SUBJECT :
FRONT & TAG AXLE – UNITIZED HUB
BEARING END PLAY VERIFICATION AND
REPLACEMENT
Step added about spindle thread repair
September 2021
APPLICATION
FROM
Writer:
EL
H3 SERIES
X SERIES
2010
2009
A-1656
9-9952
Table of contents
MATERIAL .............................................................................................................................................................. 3
REQUIRED TOOLS ................................................................................................................................................... 3
PROCEDURE ........................................................................................................................................................... 4
UNITIZED BEARING END PLAY VERIFICATION ........................................................................................................................ 7
UNITIZED HUB BEARING REMOVAL .................................................................................................................................... 9
UNITIZED HUB BEARING INSTALLATION ............................................................................................................................. 14
PARTS / WASTE DISPOSAL .....................................................................................................................................22
Writer:
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MATERIAL
NOTE
Parts can be obtained through regular channels. Please, refer to your vehicle Parts Manual
Other material required:
Part No.
Description
685274
GLEITMO 805 GREASE
685325
FUCHS RENOLITE LX PEP 2
REQUIRED TOOLS
METRIC OPEN END WRENCH SET
SOFT FACED HAMMER
IMPACT WRENCH & APPROPRIATE HEX
SOCKETS
UNITIZED BEARING INSERTION TOOL
FRONT & TAG AXLE Ø 70 mm SPINDLE
TRUCK LUG NUT TORQUE WRENCH AND
APPLICABLE HEX SOCKETS
# 491115
UNITIZED BEARING INSERTION TOOL
TAG AXLE Ø 82 mm SPINDLE
# G32950
#682384 CHIX CLOTH
Writer:
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PROCEDURE
DANGER
Park vehicle safely, apply parking brake, stop the engine. Prior to working on the vehicle, set the ignition
switch to the OFF position and trip the main circuit breakers equipped with a trip button. On Commuter
type vehicles, set the battery master switch (master cut-out) to the OFF position.
Lockout & Tag out (LOTO) must be performed during set-up, maintenance or repair activities. Refer to
your local procedure for detailed information regarding the control of hazardous energy.
The unitized hub bearings used on the tag axle and front axle are non-serviceable items. Bearings
are pre-adjusted, lubricated and have seals fitted as part of the manufacturing process. The
bearings are greased for life and there is no need or facility for re-lubrication.
Figure 1: TYPICAL Ø82 mm SPINDLE TAG AXLE HUB AND ROTOR ASSEMBLY
Writer:
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Figure 2: TYPICAL Ø82 mm SPINDLE TAG AXLE UNITIZED BEARING & WHEEL HUB. HUB FLANGE CAP
SCREW SINGLE USE ONLY, DO NOT REUSE APPLICABLE TO TAG AXLE ONLY
Writer:
EL
Figure 3: TYPICAL Ø70 mm SPINDLE FRONT AXLE HUB AND ROTOR ASSEMBLY
Writer:
EL
Unitized Bearing End Play Verification
1. Apply parking brake, raise wheels off the ground and support axle on stands.
2. When the wheels are raised, they should revolve quite freely without roughness.
3. Remove the wheels.
4. Place magnetic base of a dial indicator on the brake caliper and position dial indicator stem
against a convenient marked spot on the face of the hub flange.
Figure 4
5. With dial indicator in position pull hard but steadily on hub flange and oscillate at same time
until a steady reading is achieved.
6. Without releasing the pressure, turn bearing so that dial indicator stem contacts marked spot
and note reading on indicator.
7. Push bearing flange hard and oscillate as before until a steady reading is achieved.
8. Without releasing the pressure, turn bearing so that indicator stem again contacts the marked
spot and note new reading on indicator.
9. The difference between readings is the amount of mounted end play in bearing unit.
10. Refer to the following table for allowed end play:
Writer:
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New Tag Axle Unitized Hub Bearing Axial End play
Maximum axial play
0.0024 inch (0.061mm) based on clamp load of 20000 lbf (90 kN).
Tag Axle Unitized Hub Bearing Axial Endplay in Service
•
If the end play is between 0 – 0.002 in (0 – 0.05 mm), the inspection is complete.
•
If the end play is greater than 0.002 in (0.05 mm), but less than 0.008 in (0.20 mm), check
and retighten the wheel bearing adjusting nut. Again, check end play to make sure that the
clamping process is done properly.
•
If the end play is equal to or greater than 0.008 in (0.20 mm), replace the unitized hub
bearing as soon as possible since the hub assembly may not be safe to operate.
New Front Axle Unitized Hub Bearing Axial Endplay
Maximum axial play
0.002 inch (0.05 mm)
Front Axle Unitized Hub Bearing Axial Endplay in Service
Maximum axial play
Writer:
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0.008 inch (0.2 mm)
Unitized Hub Bearing Removal
NOTE FOR FRONT AXLE: You can find detailed information on the front axle wheel hub bearing
removal, refer to the following manual included on your vehicle Technical Publications USB flash
drive in PDF format:
Dana
Parts & Service Instructions S84U Steer Axle HUB BEARING REWORK_ Manual NO
1963 A+B iss A.
See OVERHAUL PROCEDURES, HUB END DISASSEMBLY, pages No. B3, B4, B5 & B6.
1. Stop engine and apply parking brake.
2. Loosen wheel nuts about one turn (do not remove the nuts). This is not necessary if equipped
with hydraulic powered gun.
Figure 5
3. Raise the vehicle by its jacking points on the axles.
4. Unscrew 10 wheel hex stud nuts and remove the wheel.
Figure 6
Figure 7
5. Remove the brake caliper/carrier assembly. Refer to Knorr-Bremse Pneumatic Disc Brake
Y006471 Service Manual included on the Technical Publications USB flash drive and also
available on Prevost Technical Publications site.
Writer:
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Figure 8
6. Loosen but do not remove the hub flange cap screws (Figure 9).
7. Remove 2 diametrically opposed hub flange cap screws (Figure 10).
Figure 9
Figure 10
8. Replace the two diametrically opposed hub flange cap screws with 2 loosely fitted studs.
NOTE: Replacement studs should protrude beyond the front face of the hub flange to aid removal.
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9. Unscrew 12 hub flange cap screws.
Applicable to the tag axle: discard hub flange serrated cap screws (single use only).
NOTE: The following images are generic images and do not show the actual tag or front axle hub
but they remain representative of the following steps.
10. Gently tap hub flange outwards using a hide faced hammer.
Figure 11
11. Support weight of hub flange. Remove the hub flange and place on a suitable workbench.
Figure 12
12. Inspect wheel stud and replace the ones that are found defective.
13. Once the hub flange has been removed, insert two guide studs.
Writer:
EL
Figure 13
14. Insert two bolts into brake disc extraction holes.
15. Tighten to free brake disc from hub bearing.
Figure 14
16. Support weight of brake disc and carefully slide along guide studs to remove.
Figure 15
17. Using a small ended chisel, pry off the staking on the hub nut.
Writer:
EL
Figure 16
Figure 17
18. Unscrew hub nut and discard (Figure 18).
19. Remove the thrust washer (Figure 19).
Figure 18
Figure 19
20. Screw insertion tool onto spindle (Figure 20) (front axle: 491115; tag axle G32950).
Figure 20
21. Carefully pull unitized bearing assembly and remove.
Writer:
EL
MI21-07A
Page 14 / 15
Unitized Hub Bearing Installation
1. If required, repair the first spindle threads using appropriate thread cutting die.
Front & Tag axle spindle thread: 1 ¾-8 UNR 3A
Independent Front Suspension spindle thread: M42-2.0
Figure 21
Figure 22
2. Thoroughly clean threads and spindle using EFX degreaser (Prevost #685313) or brake
cleaner.
Figure 23
3. Screw insertion tool onto spindle (front axle: 491115; tag axle G32950).
Writer:
EL
MI21-07A
Page 15 / 16
Figure 24
4. Apply a thin layer of antifriction/antifretting lubricant on the spindle where bearing will be
located (use Gleitmo 805 grease, Prevost #685274).
Figure 25: APPLY GLEITMO 805 GREASE
5. Slip unitized hub bearing over spindle.
6. Make sure the O-ring is present, see Figure 2.
Figure 26: SLIP UNITIZED HUB BEARING OVER
SPINDLE
Writer:
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MI21-07A
Page 16 / 17
NOTE
If the inner rings are not properly guided (i.e. not in line to the spindle) there may occur seizing
between inner ring and spindle before the assembly be completed. By pushing abruptly the
hub unit back, there is a risk of separation of inner rings. The clip can be dislodged as per the
two pictures below.
Always use an insertion tool
NOTE
If original bearing unit is refitted, and end float is measured at 1 mm, with hub not fully tightened
to specified torque, then the retaining clip within the unit is damaged and a new unit must be
fitted.
7. Remove the insertion tool.
8. Clean thrust washer both sides and hub nut using a good quality degreaser or brake cleaner.
9. Install thrust washer, hub nut then torque hub nut (Figure 27).
tag axle torque: 563-687 lb-ft (763-931 Nm)
front axle torque: 575-625 lb-ft (780-847 Nm)
NOTE: Rotate bearing, minimum 10 revolutions necessary (simultaneous rotation till final clamp
torque is achieved).
Writer:
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MI21-07A
Page 17 / 18
10. Make sure there is no play between the bearing and the spindle shoulder (Figure 28).
Figure 27: INSTALL THRUST WASHER AND HUB NUT
Figure 28: NO PLAY BETWEEN THE BEARING AND
THE SPINDLE SHOULDER
11. Check the unitized bearing end play. Refer to Unitized Bearing End Play Verification in this
document.
12. Stake the hub nut by deforming with a round nosed chisel.
Figure 29
Writer:
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Figure 30: CORRECT - PREVENTS THE NUT FROM
GETTING LOOSE
MI21-07A
Page 18 / 19
Figure 31: CORRECT – 2 to 3 mm / 0.078 to 0.118 in
MAX GAP
Figure 32: BROCKEN OR TORN LIP – REJECTED
Figure 33: LIP INADEQUATELY PRESSED IN – REJECTED
13. Clean hub bearing, rotor and hub flange clamping surfaces using a good quality degreaser or
brake cleaner.
Figure 34: CLEANING HUB BEARING, ROTOR AND HUB FLANGE CLAMPING SURFACES
14. Install two guide studs on the unitized bearing (Figure 35).
Writer:
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MI21-07A
Page 19 / 20
15. Install rotor onto hub bearing (Figure 36).
Figure 35
Figure 36
16. 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.
Figure 37
17. Secure hub flange and rotor to unitized hub bearing (Figure 38).
•
Tag axle: use 14 new cap screws (single-use only).
•
Front axle: discard cap screws showing signs of deformation in the threads area
and beneath the head of the bolt.
Writer:
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MI21-07A
Page 20 / 21
Refer to Figure 39 for tightening sequence.
front axle torque: 174-192 lb-ft (236-260 Nm)
tag axle torque: 161-197 lb-ft (218-267 Nm)
Figure 38: HUB FLANGE HEX CAP SCREWS
Figure 39: HUB FLANGE HEX CAP SCREW
TIGHTENING SEQUENCE
18. Once the hub flange has been correctly fitted; it is necessary to check the axial run out of the
brake disc.
19. Position a dial test indicator onto the axle in a suitable position.
Figure 40
20. Position the stylus of dial test indicator onto brake disc as shown.
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MI21-07A
Page 21 / 22
Figure 41
21. Rotate the hub through 360° and note any movement of the dial test indicator.
THE MAXIMUM RUNOUT IS 0.1 mm / 0.004 in
22. Remove and check out of specification disc to ensure no damage has occurred to the mounting
faces, or that no dirt is present.
23. Remove any dirt found on the mounting faces and refit and recheck disc.
24. Should it be found that a cleaned and refitted disc is still out of specification; it must be
replaced.
25. Mount the brake caliper. Refer to Knorr Bremse manual.
CALIPER MOUNTING BOLTS TORQUE
Tag Axle: 405-495 lbf-ft (549-671 N-m)
Front axle : 433-479 lb-ft (587-649 Nm)
26. Mount the wheel over wheel studs, being careful not to damage stud threads.
27. Screw in the hex stud nuts (refer to Figure 43 for sequence) so that the 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.
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MI21-07A
Page 22 / 22
Figure 42
Figure 43
28. Tighten stud nuts progressively as shown in Figure 43. The final tightening should be done
with a torque wrench. Tighten stud nuts.
TORQUE: 450-500 lb-ft (610-678 Nm)
PARTS / WASTE DISPOSAL
Discard according to applicable environmental regulations (Municipal/State[Prov.]/ Federal)
Access all our Service Bulletins on http://techpub.prevostcar.com/en/
Or scan the QR-Code with your smart phone
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E-mail us at technicalpublications_prev@volvo.com and type “ADD” in the subject to
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Replacement Service Bulletin Number:
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