NHTSA ID Number: 10044327
Manufacturer Communication Number: FSB-437-002-01
TSB/Document Date: 2012-06-12
Summary
MACK
: WHERE THE TRANSMISSION AND/OR ENGINE SUPPORTS ARE ATTACHED, UNDER SEVERE OPERATING CONDITIONS, CRACKS HAVE BEEN LOCATED AND THE MOUNTING BRACKETS , WITH NEW FRAMES, SHOULD BE REPLACED. MODELS LEU, MRU, MP7. MODEL YEARS 2008-2012. *PE
Field Service Bulletin
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
SB-10044327-6332
Date
Group
No.
Release
Page
5.2012
437
002
01
1(16)
Allison Transmission Mount Replacement
LEU, MRU
MP7
FSB 437-002, Transmission Mount, Replacement
(May 2012)
Allison transmissions on LEU and MRU MACK Truck models with an MP7 engine may
experience cracks in the transmission housing under severe operating conditions. The
cracks are located where the transmission/engine supports are attached. To resolve this
issue, new frame brackets, transmission mounting brackets and mounting hardware
is available for replacement of the existing transmission mounts. Additionally, the
existing dipstick and dipstick tube assembly will be replaced due to interference of the
new transmission mounting bracket. Applicable parts and procedures for replacing the
transmission mounts are provided in this Field Service Bulletin.
Note: This bulletin does not apply to MACK Trucks Australia.
W4073826
PV729-FSB437-002_M
USA52967
Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
437
002
01
Required Parts
W4073827
Transmission Mount Replacement Parts
Item #
Part Number
QTY
Description
1
25156623
1
Bracket Trans Mounted, Right Side
2
25167424
1
Bracket Trans Mounted, Left Side
3
21892421
2
Bracket Frame Side W/Liner
4
21892458
2
Bracket Frame Side WO/Liner
5
25155021
8
6
25167342
8
Rubber Insulator
7
25091937
4
8
25109333
4
Nut
9
20706115
12
10
25160670
12
11
21475322
12
Bolt 14 mm (0.5 in) x 47 mm (1.8 in) W/ Liner
12
21475321
12
Bolt 14 mm (0.5) x 42 mm (1.6 in) WO/ /Liner
13
21475706
12
Huckspin Collar
Replacement Dipstick and Dipstick Tube Assembly
Item #
Part Number
QTY
Description
1
25152437
1
Allison, Dipstick Tube
2
20925236
1
Dipstick, Transmission Oil Level
3
25195153
1
Bracket
4
3968658
1
Screw
5
25087147
1
M6 Flange Screw
6
25095637
1
Clamp
7
25161716
1
Attaching Clamp, Straight P-Clamp-Rubber
8
20706309
1
Nut
Page
2(16)
Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
437
002
01
Clamp Assembly
Part Number
Qty
1
995465
1
M8 x 35 Bolt
2
20960549
1
Clamp
3
990940
1
M8 Nut
4
N/A
N/A
Item #
Description
Transmission Coolant Pipe
Procedure
You must read and understand the precautions and guidelines in Service Information,
group 40, "General Safety Practices, Transmission" before performing this procedure.
If you are not properly trained and certified in this procedure, ask your supervisor for
training before you perform it.
1 Chock wheels.
2 Disconnect all cables from the negative (ground) battery terminals to prevent personal
injury from electrical shock and prevent damage to electrical components.
3 Raise the cab.
4 Use coolant extractor/injector 85112740 to drain coolant from engine and transmission.
5 Support transmission with suitable lifting device to enable access to engine/transmission
mounts.
6 Remove vertical transmission support fasteners, passenger side.
W4073828
Page
3(16)
Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
No.
Release
437
002
01
7 Remove the two rear passenger side spring hanger fasteners.
W4073829
8 Using a huck splitter tool, remove the huck fasteners securing frame mounted
transmission support and the applicable huck fasteners in the Diesel Exhaust Fluid (DEF)
tank bracket.
W4073830
9 Move the frame mounted transmission support forward of the transmission mounted
support.
10 Clip applicable cable ties and relocate frame mount forward inside the frame rail to give
access to transmission mounted support fasteners.
Page
4(16)
Mack Trucks, Inc.
Field Service Bulletin
Date
5.2012
Group
- 6X better wear protection on critical engine parts than...
- 1.3X better sludge protection than industry standards*
- 3X Stronger against viscosity breakdown than leading full...
- Protection for 10,000 miles between oil changes
- Meets or exceeds the following specifications: API SP/SN...
- Formulated for engines with 75,000 miles or more, Valvoline...
- Delivers 20% better wear protection and 15% better sludge...
- Extra detergents safeguard against friction, corrosion and...
- Advanced friction-fighting additives help maximize...
- Provides performance benefits for high mileage, new and...
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TSB/Document ID: FSB-437-002-01
Replacement Service Bulletin Number:
MFR Communication Date: 2012-05-01
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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