TP-1425
Issued 01-14

SB-10054898-3530

Technical Bulletin
Hazard Alert Messages
Read and observe all Warning and Caution hazard alert messages in
this publication. They provide information that can help prevent
serious personal injury, damage to components, or both.

WARNING
To prevent serious eye injury, always wear safe eye protection
when you perform vehicle maintenance or service.
Park the vehicle on a level surface. Block the wheels to
prevent the vehicle from moving. Support the vehicle with
safety stands. Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal injury and
damage to components can result.

How to Obtain Additional Maintenance,
Service and Product Information
Refer to Maintenance Manual 14, Trailer Axles; Maintenance
Manual 33, Easy-Stop™ Trailer ABS; Maintenance Manual
MM-0180, Enhanced Easy-Stop™ Trailer ABS with PLC;
Maintenance Manual 14P, Meritor Tire Inflation Systems (MTIS) by
P.S.I.™; technical publication TP-0173, Easy-Stop™ and Enhanced
Easy-Stop™ with PLC Trailer ABS Blink Code Diagnostics Guide;
and technical publication TP-89159, Axle Wheel Bearing Installation
Specifications. To obtain these publications, visit Literature on
Demand at meritor.com.

Inspection Procedures for Wheel
Ends on RMT14612 and
RMT14612ABS Axles
Issued
1TP-1425
Technical
01-14
Bulletin

Meritor Tire Inflation System (MTIS)
Component Removal and Installation
WARNING
The tire inflation system uses compressed air. Turn the system
OFF and drain the system at the petcock before maintenance
or service to avoid serious personal injury and damage to
components.
Before you perform service on an MTIS-equipped wheel end, turn
the system OFF and drain the system at the petcock. Refer to
Maintenance Manual 14P for instructions.
Record the results of the inspections on the sheet at the end of this
bulletin. Once the inspections are complete, report your findings and
send invoices to Liam Codd via email at Liam.Codd@meritor.com or
phone at (317)-839-9525, Ext. 132.

Non-ABS Wheel End Inspection (Rear Axle)
1.

Wear safe eye protection. Park the vehicle on a level surface.
Block the wheels to prevent the vehicle from moving.

2.

Remove the hub cap.

3.

Verify the hole in the lock washer is aligned with the adjusting
nut pin. Figure 1.

Figure 1

Inspecting Non-ABS and ABS Wheel
Ends

ALIGNMENT
PIN

This technical bulletin provides procedures for inspecting the wheel
ends on RMT14612 and RMT14612 ABS axles. Each trailer has one
ABS axle and one non-ABS axle. Follow the appropriate procedure
(ABS or non-ABS) for the type of axle you are inspecting.

ADJUSTING
NUT
4003269a
Figure 1

4.

앫 If the end play is not within specifications: Adjust as
necessary to obtain the correct end play. If the correct end
play cannot be obtained, call the Meritor OnTrac™
Customer Call Center at 866-668-7221 for further
instructions.

Check the outer jam nut torque according to the information in
technical publication TP-89159. The recommended torque is
300-400 lb-ft (408-544 N폷m) with a target torque of 325 lb-ft
(440 N폷m).
앫 If the outer jam nut torque is below specification:
Tighten the nut to 325 lb-ft (440 N폷m). @

5.

앫 If the outer jam nut torque is above specification: Call
the Meritor OnTrac™ Customer Call Center at
866-668-7221 for further instructions.
5.

Check the end play according to the instructions in
Maintenance Manual 14. Correct end play must measure
0.001-0.005-inch (0.025-0.127 mm).

ABS Sensor Fault Repair Procedure
1.

앫 If the end play is not within specifications: Adjust as
necessary according to the instructions in Maintenance
Manual 14 to obtain the correct end play. If the correct end
play cannot be obtained, call the Meritor OnTrac™
Customer Call Center at 866-668-7221 for further
instructions.
6.

Ensure all inspection and repair information is recorded on the
sheet at the end of this bulletin. Once all inspections are
complete, call the Meritor OnTrac™ Customer Call Center at
866-668-7221 to report your findings.

Ensure all inspection and repair information is recorded on the
sheet at the end of this bulletin. Continue on to the ABS Wheel
End Inspection. Once all inspections are complete, you must
contact Liam Codd via email at Liam.Codd@meritor.com or
phone at (317)-839-9525, Ext. 132.

Use the following steps if the diagnostics history showed ABS
faults that require repairs.
A.

Back off the slack adjuster and remove the wheel, tire and
drum according the instructions in Maintenance Manual
14.

B.

Hold the sensor, not the cable, and use a twisting motion
to pull the sensor out of its mounting block.

C.

Remove the spring clip from the mounting block.

D.

Using the supplied bracket location fixture, confirm the
mounting block location is correct. Figure 2.
앫 If the bracket location is correct: Perform the
following.

ABS Wheel-End Inspection (Front Axle)
1.

A.

Apply a mineral oil-based grease that contains
molydisulfide to the sensor spring clip and to the
body of the sensor. The grease must be
anti-corrosive and contain adhesive properties
that will continuously endure temperatures from
–40° to 300°F (–40° to 150°C).

B.

Push the spring clip into the sensor holder from
the inboard side, until the spring clip tabs are
against the sensor holder. Push the sensor into
the spring clip as far as possible.

Perform the ABS system diagnostic test according to the
instructions in Maintenance Manual MM-0180.
앫 If no sensor faults are found: Continue to Step 2.
앫 If sensor faults are found: Proceed to the ABS Sensor
Fault Repair Procedure.

2.

Verify the hole in the lock washer is aligned with the adjusting
nut pin. Figure 1.

3.

Check the outer jam nut torque according to the information in
technical publication TP-89159. The recommended torque is
300-400 lb-ft (408-544 N폷m) with a target torque of 325 lb-ft
(440 N폷m).

앫 If the bracket location is not correct: Repair the
bracket using the ABS Bracket Repair Procedure in
this bulletin.
Figure 2

앫 If the outer jam nut torque is below specification:
Tighten the nut to 325 lb-ft (440 N폷m). @
앫 If the outer jam nut torque is above specification: Call
the Meritor OnTrac™ Customer Call Center at
866-668-7221 for further instructions.
4.

Check the end play according to the instructions in
Maintenance Manual 14. Correct end play must measure
0.001-0.005-inch (0.025-0.127 mm).
4011162a
Figure 2

TP-1425
Issued 01-14
Page 2

Copyright Meritor, Inc., 2014

(16579)
Printed in USA

2.

3.

Discard the current wheel and install a new wheel hub
according the instructions in Maintenance Manual 14 and
technical publication TP-89159. Carefully install the new wheel
so that the tooth wheel pushes against the sensor as you
adjust the wheel bearings. After installation, there should be no
gap between the sensor and the tooth wheel. During normal
operation, a gap of 0.04-inch (10.16 mm) is allowable.

Table A: AWS Classifications and Specifications

Perform the sensor output voltage test as follows. Use a volt/
ohm meter to check the AC output of the sensor while rotating
the wheel at approximately one-half revolution per second.
Minimum output must be greater than 0.2 volts AC.

Gas Metal Arc

ER70S-X

A5.18

Gas Tungsten Arc

ER70S-X

A5.18

Flux Cored Arc

E70T-X

A5.20

앫 If the voltage is within specification: Return to Step 2 of
the ABS Wheel End Inspection.
앫 If minimum output is less than 0.2 volts AC: Push the
sensor toward the tooth wheel. Recheck sensor output.
앫 If the voltage is still out of specification: Call the Meritor
OnTrac™ Customer Call Center at 866-668-7221 for
further instructions.

ABS Bracket Repair Procedure
Follow this procedure if the inspection reveals a damaged ABS
bracket.

Tools Required
앫 Oxygen acetylene torch set with a No. 2 tip and gauges set, or a
plasma torch of at least 40 amps
앫 4-inch or 5-inch grinder

Method for Welding
Carbon and Low Alloy
Steels

AWS Electrode
Classification

AWS
Specification

Shielded Metal Arc

E70XX

A5.1
A5.5

WARNING
Wear safe clothing and eye protection when you use welding
equipment. Welding equipment can burn you and cause
serious personal injury. Follow the operating instructions and
safety procedures recommended by the welding equipment
manufacturers.
Axle weld locations and welding procedures must adhere to
Meritor standards. Welding at locations other than those
authorized by Meritor will void the warranty and can reduce
axle beam fatigue life. Serious personal injury and damage to
components can result.
The high temperature caused by the open flame from the
cutting torch can ignite the oil in the axle housing and can
cause serious personal injury.

Prepare the Axle for Welding

앫 Die grinder

1.

Ensure that the axle tube and brackets are 70°F (21°C) or
warmer before you weld onto the axle. Do not weld onto a cold
axle, which can adversely affect the weld material and the axle
during operation. If the temperature is below this specification,
store components in a heated room, until they reach a
temperature of 70°F (21°C) or more.

2.

Verify that the area to be welded is free of paint, grease, dirt,
rust, slag and other contaminants that can affect weld quality.

Methods and Requirements
앫 You can use four methods to weld hardware to trailer axles.
Refer to the following table for the American Welding Society
(AWS) methods, classifications and specifications.
앫 If you use the Shielded Metal Arc method, electrodes must be
clean, dry and come from stock that has been stored according
to AWS specifications.
앫 The AWS requires that weld tensile strength must be 70,000 psi
(4826.33 bar). Weld tensile strengths that are either higher or
lower than this rating are not acceptable.
앫 The best fusion and strength will be obtained using the voltage,
current and shielding medium recommended by the electrode
manufacturer.

(16579)
Printed in USA

CAUTION
When you ground welding equipment to an axle, only locate
the cable connection at components welded to the axle. Do not
locate a cable connection at a suspension spring, U-bolt or
hub. These locations will place the wheel bearing between the
ground cable connection and weld area, and can cause
electric arcing that will damage the wheel bearing.

Copyright Meritor, Inc., 2014

TP-1425
Issued 01-14
Page 3

3.

Ground welding equipment to the axle through a clean, tight
cable connection. Locate the connection at components that
are welded to the axle, such as the camshaft bracket, air
chamber bracket or brake spider. Do not locate a cable
connection at a suspension spring, U-bolt or hub. Damage to
the wheel bearing can occur from electric arcing. Figure 3.

Figure 4

Figure 3

NOT HERE

HERE

4011163a

4003152b
Figure 4

Figure 3

4.

Axles are more likely to crack at the end of the bracket
attachment welds. Avoid welding conditions such as craters,
undercuts and poor fusion at these locations by following these
guidelines.
A.

Use correct welding parameters.

B.

Start and stop the arc a short distance away from the
ends of the weld pass.

C.

2.

Disconnect the power connector from the ECU before welding
according to the instructions in Maintenance Manual
MM-0180. Reconnect the power connector once welding is
complete.

3.

Fully weld the sensor bracket to the axle. Refer to the
specifications shown in Figure 5.

Figure 5

Maintain correct arc position and length.

Remove ABS Sensor Bracket
1.

Apply an anti-splatter compound on the axle. If you do not have
an anti-splatter compound, cover the axle with nonflammable
cloth.

2.

Use a plasma arc or cutting wheel to separate the bracket from
the axle. Do not cut or grind into the trailer axle.

3.

Remove the remaining sensor bracket weld material with arc
gouging or rough grinding.

4.

Use a disc grinder to lightly grind the weld areas flat to the axle
and remove weld residue, ridges and ripples from the axle
surface. Do not gouge the trailer axle or leave sharp edges on
the axle surface.

0.19

0.63
4011164a

Figure 5

Weld ABS Sensor Bracket
1.

4.

Inspect and remove all slag from the completed weld.

5.

Paint the repair area appropriately.

6.

Once all repairs are complete, return to Step 2 of the ABS
Sensor Fault Repair Procedure.

Use the bracket location fixture to position the new sensor
bracket. Locate the fixture sensor bracket in the nine o’clock
position. Refer to Maintenance Manual 14 for additional
location information. Figure 4.

TP-1425
Issued 01-14
Page 4

Copyright Meritor, Inc., 2014

(16579)
Printed in USA

Figure 6

INSPECTION SHEET
Trailer Information
Trac’s Titian Chassis Number:
______________________________________________________
Vehicle Identification Number:
______________________________________________________
Repair Information
Wheel Location: _________________________________________
Lock Washer Condition (OK / NOT OK): _______________________
End Play Reading: ________________________________________
Outer Jam Nut Torque: ____________________________________
Wheel Location:__________________________________________
Lock Washer Condition (OK / NOT OK): ________________________
End Play Reading: ________________________________________
Outer Jam Nut Torque: ____________________________________
Wheel Location:__________________________________________
Lock Washer Condition (OK / NOT OK): ________________________
End Play Reading: ________________________________________
Outer Jam Nut Torque: ____________________________________
Wheel Location:__________________________________________
Lock Washer Condition (OK / NOT OK): ________________________
End Play Reading: ________________________________________
Outer Jam Nut Torque: ____________________________________
4011158a

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 2014
Meritor, Inc.
All Rights Reserved

Printed in USA

TP-1425
Issued 01-14
(16579)