Meritor MM-0164 User manual

an ArvinMeritor brand
Maintenance Manual MM-0164
Wheel end assembly
Hub Reduction 3 planet - 4 planet
Issued 4.2005

2ArvinMeritor Wheel end assembly
Service Notes
Before You Begin
This publication provides installation and maintenance procedures
for the ARVINMERITOR HVS 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:Anote 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.
ArvinMeritor Commercial Vehicle Systems reserves the right to revise the
information presented to discontinue the production of parts described at any time.
Access Information on ArvinMeritor's Web
Site
Additional maintenance and service information for ArvinMeritor's
commercial vehicle systems component lineup is also available at
www.arvinmeritor.com.
To access information, click on Products & Services/Tech Library
Icon/HVS Publications. The screen will display an index of
publications by type.

3
ArvinMeritor Wheel end assembly
Contents
05 Introduction:
06 Exploded view
07 Parts list
08 Cross section
10 Description
11 Tightening torques
11 Lubricants
13 Repairing the wheel end assembly
14 Disassembly
15 Staked hub nut dismantling
15 Star hub nut dismantling
17 Checking and replacing parts
17 Assembly
18 Staked hub nut assembly
18 Star hub nut asssembly
21 Troubleshooting
pg.

4ArvinMeritor Wheel end assembly
Terms used in this manual
Manufacturer:
ARVINMERITOR
Manual:
Maintenance manual no. MM-0164
Device:
Wheel end assembly
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 ArvinMeritor
web site www.arvinmeritor.com

5
ArvinMeritor Wheel end assembly
pg.
1
Introduction
06 Exploded view
07 Parts list
08 Cross section
10 Description
11 Tightening torques
11 Lubricants

6ArvinMeritor Wheel end assembly
Exploded view
1
2
3
4
6
7
8
10
13
9
12
11
14
15
16
17
18
19 20
21
22 24
25
28
30
31
32
24
23
21
25
8
27
5
26
35
29
81
15
Old version
No longer
applicable

7
ArvinMeritor Wheel end assembly
Parts list
Item Description
Hex. socket screw M10x25
Ring gear carrier
Hub nut M80x2
Hub casing
Ring gear
Sealing ring
Sun gear
Gasket
Magnetic plug
Spring washer
Hexagon screw
Cover, hub reduction
Grooved pin
Washer
Old version - No longer applicable
Retaining ring
Thrust washer
Spring washer
O-ring
Bearing spindle
Thrust washer
Planet gear
Spacer ring
Needle rollers
Thrust washer
Circlip
Retaining ring
Drive shaft
Spindle
O-ring
Magnetic washer
Star lock push on fastener
Locking Screw
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

8ArvinMeritor Wheel end assembly
Cross section

9
ArvinMeritor Wheel end assembly
Parts list
Item Description
Hex. socket screw M10x25
Ring gear carrier
Hub nut M80x2
Hub casing
Ring gear
Sealing ring
Sun gear
Gasket
Magnetic plug
Spring washer
Hexagon screw
Cover, hub reduction
Grooved pin
Washer
Plug
Retaining ring
Thrust washer
Spring washer
O-ring
Bearing spindle
Thrust washer
Planet gear
Spacer ring
Needle rollers
Thrust washer
Circlip
Retaining ring
Drive shaft
Spindle
O-ring
Magnetic washer
Star lock push on fastener
Locking Screw
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

10 ArvinMeritor Wheel end assembly
1Introduction
Description
The hub reduction unit consists of a cylindrical planetary
assembly in each hub, fig. 1. The assembly 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 planetary gears.
The sun gear is splined to the drive shaft, fig. 2. The planetary
gears are journalled in the hub casing which is fixed to the hub.
The ring gear is splined to the rear axle casing, fig. 3.
The hub is carried in two tapered roller bearings in the rear axle
casing.
When the drive shaft, and thereby the sun gear rotates, the
rotation is transmitted to the planetary gears.
Because the ring gear is fixed to the rear axle casing, the
planetary gears rotate inside the ring gear. Since the hub casing
accompanies this rotation, the movement is transmitted to the
hub. The hub reduction is 3.46:1.
This has been achieved by the number of teeth on the various
gears.
Fig. 1
Fig. 2
Fig. 3

11
ArvinMeritor Wheel end assembly
1Introduction
Description
Hub reduction 3 planet - fig. 5a
Hub reduction 4 planet - fig. 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 ArvinMeritor Web site at
www.arvinmeritor.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. 4
Fig. 5a
Fig. 5b
Torque chart specifications and data
Hub gear
Designation 3 Planet or 4 Planet
Type cylindrical planetary gear
Reduction 3.46 : 1
No. of planetary gears 3-4
Tightening torques Nm Kgm
Hub nut 1,200 ± 120 120 ± 12
Bolts, hub cover 20 ± 5 2 ± 0.5
Oil plugs (level and draining) 50 ± 12.5 5 ±1.25
Bolts, hub casing 40 ± 10 4 ±1
Lubricants
Oil type
Rear axle oil: Quality API-GL-5 / MlL-L-2105E
Viscosity:
According to the vehicle manufacturers recommendations
Oil volume:
Hub reduction rear axle: 3 litres

12 ArvinMeritor Wheel end assembly
1Introduction
Delivery, warranty and system service
This section contains instructions for the above delivery, warranty and system service. Given in the maintenance operations column below
are the servicing instructions from these manuals which apply to the rear axle hub reductions.
Service Interval Maintenance operations
Delivery Service Check for oil leakage
Check bolting
Check oil level and top-up if necessary
Warranty service 1 6 weeks or at least max. 10,000 Km Check for oil leakage
Check bolting
Change oil
Warranty service 2 6 months Check for oil leakage
Check rear axle ventilation.
System service
Maintenance programme
Lubrication service See respective lubrication chart Change oil according to lubrication chart
Basic inspection every 6 months Check for oil leakage
Check rear axle ventilation
Function and condition check
Additional service every 12 months None

13
ArvinMeritor Wheel end assembly
pg.
2
Repairing the wheel end assembly
14 Disassembly
15 Staked hub nut dismantling
15 Star hub nut dismantling
17 Checking and replacing parts
17 Assembly
18 Staked hub nut assembly
18 Star hub nut asssembly

14 ArvinMeritor Wheel end assembly
2Repairing the 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).
Tighten each bolt equally and simultaneously, and avoid using
excessive force as this could damage the drum.
A soft-faced mallet may be used on the drum to loosen and ease
withdrawal.
Unscrew the drain plug in the hub and drain out all oil.
A: 3 planetary version
B: 4 planetary version
Remove retaining screws with suitable sized wrench fig. 6 and
remove the hub cover from the end of the hub casing using a
suitable screwdriver or pry bar - fig. 7.
Remove sun gear from axle shaft and hub casing before removing
hub casing as it may fall out of hub casing and get damaged
when the hub casing is removed. - fig 8
Block the rotation of the hub, and unscrew the socket screws
retaining the hub casing and withdraw the hub casing - fig. 9.
Fig. 6
Fig. 7
Fig. 8 Fig. 9

15
ArvinMeritor Wheel end assembly
2Repairing the wheel end assembly
Remove axle shaft. fig. 10
Staked hub nut dismantling
Unscrew the hub retaining nut.
NOTE:Ahigh torque is required to shear the staking points –
and a torque multiplication device should be employed).
Remove the hub nut and discard.
Star hub nut dismantling
Remove locking screw and discard. Unscrew the hub retaining nut
and discard. (fig. 11)
WARNING: Nut cannot be reused because the
anti-friction coating on the hub nut face maybe damaged.
A high torque is required to release the nut, therefore a torque
multiplication device should be employed. Remove ring gear
carrier and ring gear.
Remove the hub assembly.
WARNING :
Support may be required as this unit is heavy
Remove the drive shaft seal by levering out, and discard (fig. 12).
WARNING : Do not reuse this seal.
Hub bearings are pre-adjusted cartridge type and cannot be
individually replaced. In case of non serviceability a replacement
service exchange hub should be refitted.
WARNING : Do not reuse this seal.
Remove the outer O-ring (30) from the hub and discard.
Fig. 12
Fig. 10
Fig. 11

16 ArvinMeritor Wheel end assembly
Remove the circlips from the planetary gear journal pins fig. 13.
Hubs can contain 3 or 4 planetary gears.
A: 3 planetary version
B: 4 planetary version
Press out the journal pins (20) using a suitable drift fig. 14.
Remove the planetary gears, washers and needle rollers.
WARNING
Take care that the needle rollers do not become dislodged
and lost. A suitably sized dowel can be inserted to retain the
needle bearings in place.
Remove the O-ring seals from the journal pins, and discard -
fig. 15.
WARNING
Do not reuse these 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. 16)
2Repairing the wheel end assembly
Fig. 13
Fig. 14
Fig. 15 Fig. 16

17
ArvinMeritor Wheel end assembly
Checking and replacing parts
Thoroughly clean all the hub parts. Check all the parts for wear,
deformation or other damage.
Check needle rollers, gears and all bearing surfaces. 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. Also
check the contact surface for the seal, on the wear ring and on
the drive shaft. Replace damaged parts.
WARNING:
With damage to the hub reduction, the final drive must
always be removed, checked and cleaned. The entire rear
axle casing must be thoroughly clean on the inside even the
space at the outer ends of the casing.
Concerning removal and installation of the drive, refer to the
service manual for the relevant drive in question.
Assembly
Grease the rollers of the planetary gears and assemble them in
the gears, with the spacer sleeve.
NOTE:each gear must have 38 needle rollers.
Place the planetary 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. 17) Fit the retaining circlips on the journal pins. (Fig. 18)
Lubricate and press into position by hand a new inner hub seal.
Refit a new outer O-ring on the hub using grease GLEITMO 805
as lubricant (fig. 19). Thoroughly grease (ALVANIA RL 3) the
spindle bearing journals and locate the hub in position on the
spindle. Locate the ring gear carrier into position.
2Repairing the wheel end assembly
Fig. 17
Fig. 18
Fig. 19

18 ArvinMeritor Wheel end assembly
2Repairing the wheel end assembly
Fig. 20
Fig. 21
Fig. 22 Fig. 23
Staked hub nut assembly
Fit a new hub nut and tighten to a torque of 150 ± 30 Nm.
Rotate hub 20 revolutions by hand and tighten the hub nut to a
final torque of 1200 ± 120 Nm.
Stake the hub nut, by deforming the hub nut flange into the
staking slots at two diametrically opposite positions.
Picture of suitable staking tool. (fig. 20)
Star hub nut assembly
Fit a new hub nut and tighten to a torque of 150 ± 30 Nm.
Rotate hub 20 revolutions by hand and tighten the hub nut to a
final torque of 1200 ± 120 Nm.
Fit new locking patch screw into relevant clear screw hole to
secure hub nut. Tighten screw to 34Nm ± 3Nm (fig. 21).
Ensure head of the screw has bottomed out on face of ring gear
and not on starred flange of hub nut (fig. 22).
Fit the axle shaft into position.
Fit a new axle shaft seal into the spindle by first lubricating with
grease (GLEITMO 805) and driving into position using a suitable
drift. (fig. 23)

19
ArvinMeritor Wheel end assembly
2Repairing the wheel end assembly
Fig. 24
Fig. 25
Fig. 26 Fig. 27
Fit the sun gear with a spring washer and thrust washer and
retain with an internal circlip. (fig. 24 - 25)
Fit the hub casing onto the hub ensuring that the hub external O-
ring is thoroughly lubricated using hub oil.
Retain the hub casing in position with two socket bolts using
thread locking compound (Loctite 243).
Tighten bolts to a torque of 40Nm ± 10Nm. Insert sun gear.
(fig. 26)
Rotate hub to engage sun gear with axle shaft spline and
planetary gears. (fig. 27)
Clean the outer face of the hub casing and inner mating face of
the cover plate, of all debris (old sealing compound, etc) to ensure
a close fit.
NOTE:If new axle shaft or new hub housing is fitted the
following procedure to setup the correct end float must be carried
out. However it is recommended to check the end float before
re-assembly of the cover.
Push the sun gear in as far as possible.

20 ArvinMeritor Wheel end assembly
2Repairing the wheel end assembly
Fig. 28
Fig. 29
Measure the distance between the sun gear thrust washer and
the face of the hub casing. (Record Dim A) fig 28.
Check sun gear free movement as follows:
• Pull out the sun gear approximately 10 mm.
• Offer up the cover plate into its position against the end of the
hub casing.
• Remove the cover, and remeasure the depth of the sun gear
thrust washer, as previously (Record Dim B).
• Ensure that Dim B is shorter than Dim A by 1 to 2 mm.
• If outside these limits, remove the thrust pin and change the
number of washers under the pin by the following procedure.
Remove the serrated thrust pin from the cover plate. Select a
serrated thrust pin for the cover plate and the number of washers
to be fitted under the pin in the cover so that the total length of
pin and washers is 0.4 to 0.6 mm shorter than the Dim A.
Place the washer in the pin bore in the cover plate and drive the
pin into the cover plate, ensuring that the serrations in the pin do
not engage in the former position. Then remeasure Dims. A and B
Refit the magnetic washer over the thrust pin and retain in
position with a new star lock fastener.
Apply sealing compound in approx. 6mm dia. bead (Dow Corning
7091) to the inner face of the cover plate in a continuous bead.
The components must be assembled immediately to permit the
silicone gasket material to compress evenly between the mating
surfaces. Refit the cover plate on the end of the hub casing and
retain with bolts and tighten to 20Nm ± 5Nm
Fill hub with 3 litres of oil as specified by vehicle manufacturer.
Fit new oil drain plug and tighten to 80Nm ± 20Nm
NOTE:with new hub cap there is an oil level line that aligns
with the bottom of the filler hole. When line is horizontal it is an
indication of permitted oil capacity. (fig. 29)