8.

Install a new inner bearing cone on the spindle and push it tight
against the seal journal. While holding the bearing cone tight
against the seal journal, ensure the bearing cone touches the
seal journal all 360 degrees around. Figure 18.

Figure 20

AIR SIDE
TOWARDS
TOOL

앫 If the bearing cone cannot be evenly seated: Pull off the
bearing cone. Inspect the collar and spindle for debris and
excessive wear.
앫 If the spindle and collar cannot be adequately cleaned
for the bearing cone to seat correctly: Replace the axle.
4009024a
Figure 18

NEW BEARING

FIT

Figure 20

SEAL
JOURNAL

B.

Align the seal and tool with the hub seal bore and drive
the seal until it bottoms out in the hub seal bore.
Figure 21.

Figure 21

SEAL
4009918b

SEAL
DRIVER

BEARING
CONE

Figure 18

BEARING
CUP

Install the Conventional Wheel End
1.

If the axle is equipped with ABS, check the condition of the
sensor and pull it fully forward on its mounting block.

2.

Apply a light coat of approved oil to the spindle bearing journal
and outside diameter of the seal journal. Figure 19.

The seal must bottom
4009919a
out all around.
Figure 21

C.

Rotate the tool and apply several light blows to ensure the
seal is correctly seated. The seal should be square to the
hub all around.

D.

Check the inner bearing to verify it rotates freely.

E.

Check the inner seal surface rotates freely after
installation in the hub.

Figure 19

OUTSIDE
DIAMETER OF
SEAL JOURNAL

SPINDLE BEARING
JOURNAL

4.

Apply a light coat of oil the seal’s inner bore.

4009304a
Figure 19

3.

Oil and install the new inner bearing cone and the new hub
seal in the hub. Use the following steps to install the seal.
A.

Lubricate the seal according to the following
recommendations, then place the seal with the “AIR SIDE”
towards the installation tool, Stemco® tool number
551-5412. Figure 20.

TP-1268
Issued 05-12
Page 6

Copyright Meritor, Inc., 2012

(16579)
Printed in USA

WARNING

Figure 23

ADJUSTMENT
INDICATOR
MARKING

Take care when using lifting devices during service and
maintenance procedures to avoid serious personal injury and
damage to components. Inspect a lifting strap to ensure that it
is not damaged. Do not subject the lifting straps to shocks or
drop-loading.

CAUTION
When you tighten the spindle nuts, the hub will seat to the
correct position. Do not try to completely seat the hub by hand.
Damage to components can result.

4008976b
Figure 23

5.

Support the hub using an appropriate method. Align and install
the hub onto the spindle. The hub must be supported correctly
or damage to the spindle threads or seal can occur. Figure 22.

B.

Install the hub retaining nut and tighten until the nut is
fully engaged on the spindle thread. Figure 24.

Figure 24

Figure 22

SPINDLE

HUB

Figure 24

Figure 22

6.

4008977a

4009141a

Align the hub bore with the spindle and push the hub assembly
into position until the seal is started on the oil seal collar.

C.

CAUTION
Correctly support the hub before you install the outer bearing.
Ensure the hub remains supported during the bearing
installation to prevent damage to components.
7.

With the hub correctly supported, install an oiled outer bearing
cone. This will help maintain alignment of the components.

8.

Adjust the bearings as follows. Do not allow the hub to become
unsupported prior to the installation of the outer bearing.
A.

Install the retaining washer into the hub. Ensure the
adjustment indicator markings are facing outwards.
Figure 23.

(16579)
Printed in USA

While rotating the hub, use a 4-3/8″ eight-sided socket to
tighten the nut to 200 lb-ft (272 N폷m). The hub MUST be
rotated three revolutions while the end nut torque is
continuously applied. @

CAUTION
Do not rotate the hub assembly with the retaining nut loose.
The bearings can become unseated and damage to
components can result.
D.

Back off the nut two to four flats of the socket,
approximately 1/4-1/2 turn, counterclockwise. Do NOT
rotate the hub assembly with the retaining nut loose or the
bearings can become unseated.

E.

Retighten the nut to 50 lb-ft (68 N폷m) while rotating the
hub assembly a minimum of three times. @

F.

Back off the nut one flat of the socket, approximately 1/8
turn, counterclockwise. Do NOT rotate the hub assembly
with the retaining nut loose or the bearings can become
unseated.

Copyright Meritor, Inc., 2012

TP-1268
Issued 05-12
Page 7

G.

Rotate the nut in a CLOCKWISE direction, in the
’tightening’ direction, until the corners of the nut align
with the NEXT nearest mark on the face of the retaining
washer. Figure 25.

Figure 27

앫 If the corners of the nut already line up EXACTLY
with an index mark: Do not further rotate the nut.
Figure 25

4008979a
Figure 27

9.

Check for free rotation of the hub assembly and inspect the
wheel bearing end play as follows.
A.

4008978a

Attach the magnetic base of a dial indicator to the spindle.
Touch the dial indicator stem to the hubcap gasket face.
Figure 28.

Figure 25
Figure 28

H.

Mark the washer and nut to ensure correct alignment.
Figure 26.

DIAL
INDICATOR
STEM

Figure 26

WASHER

ALIGNMENT
MARKS

NUT

MAGNETIC
BASE
4001742a
Figure 28

4009193a

B.

Figure 26

NOTE: The button-head screws include a nylon thread locking
patch. The locking properties of this patch are only effective three
times during initial assembly and adjustment. Discard these screws
once they have been used three times and replace them with new
screws.
I.

Install the two new button-head screws into the hub
retaining nut and tighten evenly until both the heads are
flush with the face of the nut. Ensure the marked nut and
washer are aligned prior to installing the retaining screws.
Ensure the screws correctly engage in the holes in the
lock washer.

J.

Use a 5 mm Allen-head socket and torque wrench to
tighten the two button-head screws to 11-15 lb-ft
(15-20 N폷m). Ensure the button-head screws are fully
seated flush with the nut face. Figure 27. @

TP-1268
Issued 05-12
Page 8

Slightly rotate the wheel end in both directions while
pushing inward until the dial indicator does not change.
Set the dial indicator to ZERO. Figure 29.

Figure 29

PUSH

4001743a
Figure 29

Copyright Meritor, Inc., 2012

(16579)
Printed in USA

C.

Slightly rotate the wheel end in both directions while
pulling outward until the dial indicator does not change.
Figure 30.

Figure 31

HUBCAP

Figure 30

CAPSCREW
PULL

4009142a
Figure 31

11. Install the MTIS thru-tee into the hubcap, if equipped.
4001744a

WARNING

Figure 30

WARNING
You must adjust wheel bearing end play to within
0.001-0.005-inch (0.025-0.127 mm). An adjustment that is too
loose will reduce wheel-end bearing life, increase spindle
wear and cause seal leakage. An adjustment that is too tight
can affect wheel-end bearing performance. Loss of wheel-end
components, serious personal injury and damage to
components can result.
D.

Only add lubricant to the hubcap full line. Do not overfill the
wheel-end cavity. Wipe away any excess oil, because it can
contaminate the brake linings and affect brake performance.
Serious personal injury and damage to components can result.
12. Fill the wheel end with oil as follows.

End play is the difference between the two readings.
Ensure the bearing end play is 0.001-0.005-inch
(0.025-0.127 mm).

앫 If end play is excessive (over 0.005-inch [0.127 mm]):
Back off the two screws and retaining nut and restart the
procedure at Step 8C.

A.

Fill the wheel end with an approved oil to the hubcap full
line. Figure 32 and Figure 33.

B.

Install the hubcap fill plug and tighten to 15-20 lb-ft
(20-27 N폷m). @

C.

Rotate the hub to help distribute the oil. The oil must be
given sufficient time to settle prior to a final check of the
oil level. This is especially important in cold conditions.

Figure 32

NON-MTIS
HUBCAP

앫 If end play is too tight (under 0.001-inch [0.025 mm])
or the hub assembly does not rotate freely: Back off the
two screws and back the retaining nut off
(counterclockwise) by ONE washer tick mark. Reinstall the
two screws. Ensure the hub is rotating freely and recheck
the end play.

HUBCAP
FULL LINE

10. Once end play is within specifications, install the hubcap using
a new black hubcap gasket. Install the capscrews and tighten
them in a crisscross pattern to 15-30 lb-ft (20-41 N폷m).
Figure 31. @

Shading indicates
correct amount
of oil.
4010194a

Figure 32

(16579)
Printed in USA

Copyright Meritor, Inc., 2012

TP-1268
Issued 05-12
Page 9

Figure 33

MTIS
HUBCAP

HUBCAP
FULL LINE

Shading indicates
correct amount
of oil.
4010210a

Figure 33

Approved Gear Oil Specification
API GL-5 SAE 80W/90
API GL-5 SAE 75W/90
API GL-5 SAE 75W/140
13. If equipped with ABS, ensure the wheel sensor is pushed
outward to the hub’s ABS ring.
14. Reinstall the tire and wheel assembly. Refer to the wheel
manufacturer’s service information for correct procedures.
15. With the vehicle lowered on level ground, recheck the oil level
in each hub’s sight glass.
16. Inspect the wheel-end oil level at least every 1,000 miles
(1600 km). To check, verify that the vehicle is on level ground,
then clean the hubcap window and observe the oil level. Add
lubricant if the oil level is below the full line.

Meritor Heavy Vehicle Systems, LLC
2135 West Maple Road
Troy, MI 48084 USA
866-OnTrac1 (668-7221)
meritor.com

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 Heavy Vehicle Systems, LLC, reserves the right to revise the information presented or
to discontinue the production of parts described at any time.
Copyright 2012
Meritor, Inc.
All Rights Reserved

Printed in USA

TP-1268
Issued 05-12
(16579)