Meritor MM-0164 User manual

Maintenance Manual MM-0164
Wheel end assembly
Hub R duction 3 - 4 plan ts
- Wh l nd with unitiz d b aring
- Traditional wh l nd
Revised 03-2019

2Meritor Wheel end assembly
Service Notes
Before You Begin
This publication provides installation and maintenance procedures
for the MERITOR VS wheel end assembly.
The information contained in this publication was current at the
time of printing and is subject to revision without notice or liability.
You must understand all procedures and instructions before you
begin maintenance and service procedures.
You must follow your company's maintenance and
service guidelines.
You must use special tools, when required, to avoid serious
personal injury and damage to components.
Meritor uses the following notations to alert the user of possible
safety issues and to provide information that will help to prevent
damage to equipment and components.
WARNING
A WARNING indicates a procedure that you must follow
exactly to avoid serious personal injury.
CAUTION
A CAUTION indicates a procedure that you must follow
exactly to avoid damaging equipment or components.
Serious personal injury can also occur.
NOTE: A note indicates an operational, procedure or instruction
that is important for proper service. A NOTE can also supply
information that will help to make service quicker and easier.
This symbol indicates that you must tighten fasteners to a
specific torque.
Information contained in this publication was in effect at the time the publication
was approved for printing and is subject to change without notice or liability.
Meritor Commercial Vehicle Systems reserves the right to revise the information
presented to discontinue the production of parts described at any time.
Access Information on Meritor's Web Site
Additional maintenance and service information for Meritor's
commercial vehicle systems component lineup is also available at
www.meritor.com.
To access information, click on Products & Services/Tech Library
Icon/ VS Publications. The screen will display an index of
publications by type.

3
Meritor Wheel end assembly
Contents
05 Part 1
Hub reduction with 3 - 4 planets:
Wheel end with unitized bearing
05 1 - Description
06 Exploded view
07 Parts list
08 Cross-sectional view
09 Parts list
10 Description
11 Tightening torques
12 ub reduction magnets
12 Lubricants
13 2 - Wheel end disassembly
14 Disassembly
16 Star hub nut dismantling
19 Checking and replacing parts
21 3 - Wheel end assembly
22 Seal assembly
26 ub assembly
28 Final Clearance calculation
31 Part 2
Traditional wheel end with 3-4 planets:
Spindle fitted with interference
31 1 - Description
32 Exploded view
33 Cross-sectional view
34 Parts list
35 Description
36 Tightening torques
36 Lubricants
39 2 - Wheel end disassembly
40 Wheel end disassembly
47 Checking and replacing parts
47 3 - Wheel end assembly
48 Wheel end assembly
50 ub assembly
52 Final Clearance calculation
pg. 55 Part 3
Traditional wheel end with 3-4 planets:
Spindle fitted with screws
55 1 - Description
56 Exploded view
57 Cross-sectional view
58 Parts list
59 Description
60 Tightening torques
60 Lubricants
63 2 - Wheel end disassembly
64 Wheel end disassembly
71 3 - Wheel end assembly
72 Wheel end assembly
78 ub assembly
80 Final Clearance calculation
83 4 - Troubleshooting and Service Tools
84 Troubleshooting
85 Service Tools
pg.

4Meritor Wheel end assembly
Terms used in this manual
Manufacturer:
MERITOR
Manual:
Maintenance manual no. MM-0164
Device:
Wheel end assembly
ub reduction with 3 - 4 planets:
- Wheel end with unitized bearing
- Traditional wheel end 3-4 planets
Technician:
Qualified personnel working on wheel end assembly maintenance
and servicing.
Maintenance and servicing:
Maintenance and servicing refer to periodical checks and/or
replacement of wheel end parts or components. It also refers to
the determining of the cause of a malfunction in order to restore
the initial operating conditions.
Operator:
Any person who will use the wheel end assembly as part of a
more complex device.
Warranty
Warranty applies to the wheel end assembly installed on vehicles
for which it was designed. Warranty is void in the following cases:
• Improper use of the vehicle on which the wheel end assembly
is installed (usage conditions, overloading etc.)
• Tampering with vehicle components that may affect wheel end
assembly performance.
• Use of non-original spare parts.
• Improper installation, adjustment, repair or modification.
• Poor or improper maintenance (including consumables other
than those specified).
Further information on warranty conditions may be obtained
directly from the manufacturer or by referring to the Meritor web
site www.meritor.com

5
Meritor Wheel end assembly
pg.
1
Part 1
Hub reduction with 3 - 4 planets:
Wheel end with unitized bearing
06 Exploded view
07 Parts list
08 Cross-sectional view
09 Parts list
10 Description
11 Tightening torques
11 Lubricants

6Meritor Wheel end assembly
1Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Exploded view
Old version.
No more
applied
Old version
New version: 5.69375-02

7
Meritor Wheel end assembly
1Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Parts list
Item Description
ex. socket screw M10x25
Ring gear carrier
ub nut M80x2
ub casing
Ring gear
Sealing ring
Sun gear
Gasket
Magnetic plug
Spring washer
exagon screw
Cover, hub reduction
Grooved pin
Washer
Plug
Retaining ring
Thrust washer
Spring washers
O-ring
Bearing spindle
Thrust washer
Planet gear
Spacer ring
Needle rollers
Thrust washer
Circlip
Retaining ring - Circlips - Snap ring
Drive shaft
Spindle
O-ring
Magnetic washer
Star lock push on fastener
Locking Screw
Inner hub seal
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
35
36

Solid / ollow
shaft
8Meritor Wheel end assembly
1Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Cross sectional vew - ( ub Nut Star version)

9
Meritor Wheel end assembly
1Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Parts list - ( ub Nut Star version)
Item Description
Sunk head screw M10x25
Ring gear carrier
ub nut M80x2
ub casing
Ring gear
Sealing ring
Sun gear
Gasket
Magnetic plug
Spring washer
exagon screw
Cover, hub reduction
Grooved pin
Washer
Plug
Retaining ring
Thrust washer
Spring washers
O-ring
Bearing spindle
Thrust washer
Planet gear
Spacer ring
Needle rollers
Thrust washer
Circlip
Retaining ring
Drive shaft
Spindle
O-ring
Magnet
Retaining clip
Adapter
Flange screw
Bolt socket head screw
Inner hub seal
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

10 Meritor Wheel end assembly
1Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Description
The hub reduction unit consists of a cylindrical planetary
assembly in each hub, fig. 1.1. The reduction is made up of a
sun gear, a number of planetary gears 3 or 4 which rotate round
the sun gear and a ring gear which houses the planets gears.
The sun gear is located on the axle shaft by spline, fig. 1.2
The ring gear is jointly to the rear axle spindle by spline, fig. 1.3
The hub is carried on two tapered roller bearings.
When the drive shaft, and the sun gear rotates, the rotation is
transmitted to the planets gears.
Because the ring gear is fixed to the rear axle spindle, the planets
gears rotate inside the ring gear and the rotation movement is
transmitted to the hub assy.
Ratio formula = 1+(Z Ring gear / Z Sun teeth), fig. 1.4
The hub reduction ration is 3.46:1 or 3.33:1
Ratio (3.46:1) - 3 or 4 planets 1+(64/26)=3.46
Ratio (3.33:1) - 3 or 4 planets 1+(63/27)=3.33
Fig. 1.1
Fig. 1.2 Fig. 1.3
Fig. 1.4
Ring gear
Sun gear
Axle shaft
Sun teeth
Ring gear
Planets
gears

11
Meritor Wheel end assembly
Description
ub reduction 3 planets - fig. 1.5a
ub reduction 4 planets - fig. 1.5b
In order to ensure reliable and efficient wheel end assembly
operation, maintenance intervals, use of lubricants and correct
procedures specified by the manufacturer should be strictly
observed (refer to Lubrication Maintenance Manual no. 1).
For further information contact the manufacturer’s engineering
department or refer to the Meritor Web site at www.meritor.com
(technical library - manuals).
WARNING
Only original Meritor spare parts should be used. Use of non-
recommended lubricants will adversely affect performance
and service life. Use of non-original parts could seriously
affect wheel end assembly performance.
Fig. 1.5a
Fig. 1.5b
Torque chart specifications and data
Hub gear
Type cylindrical planetary gear
Designation 3 or 4 Planets (19 teeth)
Ratio (3.46:1) 1+(64/26)=3.46
Ratio (3.33:1) 1+(63/27)=3.33
Tightening torques Nm
ub nut 1200 ± 120
ub nut locking screw version 45±5
ub cover screws 20 ± 5
ub casing screws 40 ± 10
Oil plugs (level and draining) 80 ± 20
Lubricants
Oil type
2.5 litres for each-hub
1Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
1
2
3
12
3
4

12 Meritor Wheel end assembly
Fig. 1.8
Fig. 1.6
Filler plug
Top up oil until starts
to come out of filler hole
Oil level indicator
Hollow shaft
Fig. 1.9
Filler plug
Top up oil until starts
to come out
of filler hole
Oil level
indicator
Solid shaft
ub reduction
Magnet location
Fig. 1.7
ub reduction
Magnet location
Hub Reduction Magnets
Lubricant
1Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing

13
Meritor Wheel end assembly
pg.
2
Part 1
Wheel end disassembly
14 Disassembly
16 Star hub nut dismantling
19 Checking and replacing parts

14 Meritor Wheel end assembly
Disassembly
Remove the wheel nuts and retain. Pull off the wheels using a
wheel trolley. Remove the air inflation valve from its retainer in the
inside wheel.
Jack up the rear axle of the vehicle to vehicle manufacturers
recommendations and drain the oil from the axle(s). Fig. 2.2
Remove the hub drain plug and discard.
Drain oil from wheel end. Fig. 2.3
Tighten in dedicated holes the tool’s screws equally and
simultaneously, and avoid using excessive force as this could
damage the drum. Fig. 2.4
A soft-faced mallet may be used on the drum to loosen and ease
withdraw.
Fig. 2.1
Fig. 2.2
Fig. 2.3 Fig. 2.4
2Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing

15
Meritor Wheel end assembly
2Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Remove cover retainer screws with suitable sized wrench and
remove the hub cover from the end of the hub casing - Fig. 2.5
Remove the retaining ring sun gear and spring washers from axle
shaft - Fig. 2.6
Remove the 2 sunk head screws M10X25 - Fig. 2.7
Remove the hub casing group and remove axle shaft - Fig. 2.8
Fig. 2.6Fig. 2.5
Fig. 2.7
Fig. 2.8
Retaining ring
Sun gear

16 Meritor Wheel end assembly
2Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Fig. 2.10
Fig. 2.11
Fig. 2.9
The current Meritor wheel end assembly is based on with star nut
solution.
NOTE: A high torque is required to shear the staking points and
a torque multiplication device should be employed. Fig. 2.10
Remove the hub nut and discard.
Star hub nut dismantling
Remove locking screw and discard. Unscrew the hub retaining nut
and discard. Fig. 2.11
Nut cannot be reused because the anti-friction coating on the hub
nut face maybe damaged.
NOTE: A high torque is required to release the nut, therefore a
torque multiplication device should be employed.
Star Nut

17
Meritor Wheel end assembly
2Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Fig. 2.13
Fig. 2.14
Fig. 2.12
Remove the ring gear group. Fig. 2.12
Remove the hub assembly. Fig. 2.13
WARNING:
Do not reuse this seal.
Remove the outer O-ring from the hub and discard. Fig. 2.14
Remove the drive shaft seal by levering out, and discard. Fig.2.15
WARNING:
Do not reuse this seal.
ub bearings are pre-adjusted cartridge type and cannot be
individually replaced. In case of non serviceability a replacement
service exchange hub should be refitted.
O Ring
Fig. 2.15

18 Meritor Wheel end assembly
Remove the circlips from the planets gear journal pins Fig. 2.16
Hubs can contain 3 or 4 planetary gears.
A: 3 planets version
B: 4 planets version (showed)
Press out the journal pins using a suitable drift.
Remove the planet gears, washers and needle rollers. Fig. 2.17
Remove the O-ring seals from the journal pins, and discard.
Fig. 2.18
WARNING:
Do not reuse these O-Ring seals as old seals cannot protect
against oil leaks when rebuilt.
Remove the ring gear locking ring (internal circlip), and separate
the ring gear from its carrier - Fig. 2.19
2Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Fig. 2.16
Fig. 2.17
Fig. 2.18 Fig. 2.19

19
Meritor Wheel end assembly
Checking and replacing parts.
1. Thoroughly clean all the hub parts.
2. Check all the parts for wear, deformation or other damage.
3. Check needle rollers, gears and all bearing surfaces.
4. If a planetary gears is damaged, all the planetary gear journals
and rollers must also be replaced at the same time since they
are matched within the same tolerance class for optimally
smooth operation.
5. Also check the contact surface of the seal on the drive shaft.
6. Replace damaged parts. Grease the rollers of the planets gears
and assemble them in the gears, with the spacer sleeve. Fig. 2.20
NOTE: each gear must have 38 needle rollers.
Place the planets gears and thrust washers in the hub casing,
aligning with the journal pin bore, and ensuring that the brass
washers are in contact with the hub casing. Fit new O-rings on
the journal pins and grease thoroughly with GLEITMO 805 grease.
Press in the journal pins using a drift. The pins should be pressed in
sufficiently to allow the retaining circlips to be fitted inside. Fig.2.21
Fit the retaining circlips on the journal pins. Fig. 2.22
If damaged: remove the old inner seal and lubricate and press
into position by hand a new inner hub seal. Fig. 2.23
2Part 1 - ub reduction with 3 - 4 planets
Wheel end with unitized bearing
Fig. 2.20
Fig. 2.21
Fig. 2.22 Fig. 2.23

20 Meritor Wheel end assembly