SB-10057917-4691

TP-1214
Revised 03-15

Input Adjusting Ring Leak Repair
Procedure for Meritor MT-14X
Series Forward Differential
Carriers

Technical Bulletin

1Revised
TP-1214
Technical
03-Bulletin
15

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.
Take care when you use Loctite adhesive to avoid serious
personal injury. Read the manufacturer’s instructions before
using this product. Follow the instructions carefully to prevent
irritation to the eyes and skin. If Loctite adhesive material
gets into your eyes, follow the manufacturer’s emergency
procedures. Have your eyes checked by a physician as soon as
possible.
Use a brass or synthetic mallet for assembly and disassembly
procedures. Do not hit steel parts with a steel hammer. Pieces
of a part can break off. Serious personal injury and damage to
components can result.

앫 Wear safe eye protection.
앫 Wear clothing that protects your skin.
앫 Work in a well-ventilated area.
앫 Do not use gasoline or solvents that contain gasoline.
Gasoline can explode.
앫 You must use hot solution tanks or alkaline solutions
correctly. Read the manufacturer’s instructions before
using hot solution tanks and alkaline solutions. Then
carefully follow the instructions.

Important Notice
Meritor 14X series forward differential carriers, manufactured after
February 28, 2015, have been redesigned at the input adjusting
ring-to-front cover interface. The new interface now incorporates an
O-ring at the inboard end of the adjusting ring. Figure 1 and
Figure 2. The new and old design adjusting rings and covers
are INCOMPATIBLE.
Figure 1

NEW DESIGN

O-RING
ADJUSTING
RING

Observe all warnings and cautions provided by the press
manufacturer to avoid damage to components and serious
personal injury.
Solvent cleaners can be flammable, poisonous and cause
burns. Examples of solvent cleaners are carbon tetrachloride,
and emulsion-type and petroleum-base cleaners. Read the
manufacturer’s instructions before using a solvent cleaner,
then carefully follow the instructions. Also follow the
procedures below.

4011800a
Figure 1

Figure 2

Figure 4

NEW DESIGN COVER, NON-PUMP VERSION,
PART NUMBER 3226S1709

OLD DESIGN
ADJUSTING
RING

ROUGH PART
NUMBER

E1

695

4011801a
Figure 2

4011803a

The carrier design version, old or new, must be identified prior to
performing repairs. Both the pumped and non-pumped carriers use
newly designed covers that have rough part numbers located
adjacent to the internal pinion stem. Figure 3 and Figure 4. Both
covers shown are the new O-ring design. Covers that do not have
one of these two rough part numbers are the old “non-O-ring”
design.

Figure 4

How to Obtain Additional Maintenance,
Service and Product Information
Refer to Maintenance Manual MM-0970, MT-14X Series
Single-Reduction Forward Differential Carriers on Tandem Axles. To
obtain this publication, visit Literature on Demand at meritor.com.

Figure 3

How to Obtain Tools and Supplies

NEW DESIGN COVER, PUMP VERSION,
PART NUMBER 3226T1710

Contact Meritor’s commercial vehicle aftermarket at
888-725-9355.

Required Tools
Table A: Tool List
Meritor 2728T1 seal installation driver
J1

ROUGH PART
NUMBER

70

Meritor 2728T2 sleeve installation driver
0

Calibrated torque wrench capable of 750-850 lb-ft
(1020-1150 N폷m)
4011802a

(Use of a torque multiplier is acceptable)
2-1/4″, 6-point socket

Figure 3

Dial indicator with magnetic base
Pry bar
Standard spanner wrench, size range covering 5.3″ diameter
(Examples: Armstrong Tools 34-310 or JH Williams 474A)

TP-1214
Revised 03-15
Page 2

Copyright Meritor, Inc., 2015

(16579)
Printed in USA

Parts List

Table E: KIT-2937 Parts for Old to New Design Cover Retrofit,
Pump

The parts you need will vary by the repair required.
Table B: KIT-2920 Parts for Old Design Cover Repair or Seal
Replacement
Part Number

Description

Quantity

2297L9086

Loctite 577 thread sealant

1

A1 1205X2728

Input seal

1

2214W1271

Input adjusting ring

1

Table C: KIT-2935 Parts for New Design Cover Repair
Part Number

Description

Quantity

5X1477

O-ring

1

A1 1205X2728

Input seal

1

KIT 2826

Input nut and washer

1

2297H8406

Sealant

1

Table D: KIT-2936 Parts for Old to New Design Cover Retrofit,
Non-Pump

Part Number

Description

Quantity

2214Q1343

Adjusting Ring

1

A 3226T1710

Bearing Cage Assembly,
Pump

1

5X1477

O-ring

1

A1 1205X2728

Input Seal

1

KIT 2826

Input Nut and Washer

1

2297A7021

Sealant, Cover to Main Case

1

5X1368

O-ring, IAD to Housing
(0.07″ [1.78 mm] for use
on earlier carriers, if
applicable)*

1

5X1414

O-ring, IAD to Housing
(0.21″ [5.33 mm] for use
on later carriers, if
applicable)*

1

2297H8406

Sealant

1

MS212035-2

Front Cover Bolts

10

MS208016A-2

New Lock Plate Bolt

1

Fasteners

Part Number

Description

Quantity

2214Q1343

Adjusting Ring

1

3226S1709

Bearing Cage

1

5X1477

O-ring

1

A1 1205X2728

Input Seal

1

KIT 2826

Input Nut and Washer

1

2297A7021

Sealant, Cover to Main Case

1

5X1368

O-ring, IAD to Housing
(0.07″ [1.78 mm] for use
on earlier carriers, if
applicable)*

1

Photos Required for Warranty
Processing

O-ring, IAD to Housing
(0.21″ [5.33 mm] for use
on later carriers, if
applicable)*

1

IMPORTANT: This repair requires that photographs be supplied to
the Meritor OnTrac™ Customer Call Center (866-668-7221) prior
to the start of the repair for warranty consideration. Refer to the
photographs in the Confirm the Leak section.

Sealant

1

MS212035-2

Front Cover Bolts

10

MS208016A-2

New Lock Plate Bolt

1

5X1414

2297H8406

*Use 5X1368 (0.07″ [1.78 mm]) or 5X1414 (0.21″ [5.33 mm]),
according to the size of the groove on the carrier face.

Confirm the Leak
Before performing the leak repair procedure, confirm the leak is
coming from between the adjusting ring and cover, and not between
the seal and yoke. If necessary, clean and inspect the area closely to
verify the source of the leak.

Fasteners

*Use 5X1368 (0.07″ [1.78 mm]) or 5X1414 (0.21″ [5.33 mm]),
according to the size of the groove on the carrier face.

(16579)
Printed in USA

Many leaks are misdiagnosed. Some leaks which look like a stain on
the front cover surrounding the input yoke area are simply assembly
grease. The new seal assembly parts shown in Figure 5 and
Figure 6 illustrate the red pre-grease required for the break-in
period. A repair is not necessary if there is not an actual “wet” area
below the seal and adjusting ring area. Figure 7. Figure 8 shows a
true seal or adjusting ring leak which looks wet in appearance.

Copyright Meritor, Inc., 2015

TP-1214
Revised 03-15
Page 3

Figure 9 illustrates what to look for when examining seals for a leak.
If the seal leaks between the primary seal lips and the yoke, the red
pre-grease previously mentioned will wash out. The presence of the
red pre-grease between the primary and secondary seal lips
indicates that the leak is not coming from the seal lip-to-yoke sleeve
interface.

Figure 8

Figure 5

RED PRE-GREASE
BETWEEN PRIMARY AND
SECONDARY SEAL LIPS

Visually wet
area indicates
a seal or
adjusting ring
leak.

SEAL

4011173a
Figure 8

4011170a

Figure 9

Figure 5

Pre-grease is
present between
the primary and
secondary seal
lips.

Figure 6

RED PRE-GREASE
ON SEAL SLEEVE
SURFACE

4011171a
Figure 6

4011174a
Figure 9

Repair Guidelines

Figure 7

For Leaks Previously Repaired with Kit 2920
If a leak exists, look up the vehicle’s history to determine if kit 2920
has been previously installed. You can use the VIN/chassis # to look
it up either in the OEM’s warranty system or the fleet repair facility’s
system.

Leak Repair Strategy
DARK
DARK AREA
AREA —
—
DOES
DOES NOT
NOT
INDICATE
INDICATE A
A LEAK
LEAK
4011172a
Figure 7

TP-1214
Revised 03-15
Page 4

앫 If the red pre-grease is washed out of the area between the
primary and secondary lips: Remove and replace the seal
ONLY. Refer to the Seal Replacement Procedure in this bulletin.
앫 If the red pre-grease is not washed out of the area between
the primary and secondary seal lips and this a first time
adjusting ring leak repair, or if you believe a leak exists but
the visual checks are inconclusive: Perform the Leak Repair
Procedure in this bulletin.