FSB 861-006

Field Service Bulletin
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
This Field Service Bulletin replaces bulletin, “FSB861-006, Bumper,
Replacement” PV729-FSB861–006_M (USA67108) dated (01/2015).
Date
Group
No.
Release
Page
1.2015
861
006
02
1(8)
Bumper, Replacement
MRU
FSB 861-006, Bumper, Replacement
(January 2015)
The current front bumper on some MACK MRU trucks built between 10/22/2007 and 11/14/
2014 may experience twisting and warping when mounted with single support struts at each
end of the bumper. To prevent warping and twisting of the front bumper, a more robust
bumper design will replace the current bumper (part number 25165882, or 25165881).
Additionally, new bumper brackets and mounting hardware will be used install the new front
bumper. See the table below for required parts.
Note: This bulletin does not apply to MACK Trucks Australia.
W8094109
Required Parts (Bumper, Replacement)
Item
Description
Part Number
Qty
1
Bumper, ST STL Clad Aluminum
82778556
1
2
Bumper, Front
82778558
1
3
Bracket, Bumper
82760446
2
4
Hexagon Nut
25165836
4
5
Hexagon Nut
25165835
4
6
Hexagon Screw
25166096
4
7
Lock Washer
25165838
4
8
Flat Washer
25165840
8
9
Lock Washer
25165837
4
10
Hexagon Screw
25168212
4
11
Flat Washer
25165839
8
PV729-FSB861-006_M
USA68736
Mack Trucks, Inc.
Field Service Bulletin
Date
1.2015
Group
No.
Release
861
006
02
Decommissioning the Truck for Repair
You must read and understand the precautions and guidelines in Service Information,
group 80, "General Safety Practices, Body, Cab, and HVAC" before performing this
procedure. If you are not properly trained and certified in this procedure, ask your
supervisor for training before you perform it.
NOTE: Information is subject to change without notice. Illustrations are used for reference
only and can differ slightly from the actual vehicle being serviced. However, key
components addressed in this information are represented as accurately as possible.
1 Park the vehicle on a flat and level surface.
2 Apply the parking brake.
3 Place the transmission in neutral or park.
4 Install the wheel chocks.
W7086748
5 Disconnect the cable from the battery’s negative terminal.
W3086747
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
1.2015
Group
No.
Release
861
006
02
Bumper Replacement Procedure
1
Note: The right side of the truck is shown for instructional purposes.
WARNING
Heavy component, exercise caution when handling the bumper. Assistance is required.
With assistance, remove the fasteners securing the bumper to the chassis and support
brackets.
W8094110
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
1.2015
Group
No.
Release
861
006
02
2
WARNING
Heavy component, exercise caution when handling the bumper. Assistance is required.
With assistance, remove the bumper.
W8094111
3 Remove the fasteners securing the bumper support brackets to chassis on both sides.
Note: Discard the bumper to chassis support brackets.
Note: Store the fasteners for reuse.
W8094112
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
1.2015
Group
No.
Release
861
006
02
4 Using the stored fasteners, reinstall the fasteners in the chassis as shown below.
5 Tighten the fasteners to 271 ± 67 Nm (200 ± 50 ft-lb).
W8094113
6
WARNING
Heavy component, exercise caution when handling the bumper. Assistance is required.
With assistance, position the replacement bumper and install the upper center mounting
fasteners and flat washers to support the bumper.
Note: Do not install the hex nuts and washers on the other side of the bumper at his time.
W8094114
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
1.2015
Group
No.
Release
861
006
02
7 Position the new chassis to bumper support brackets on both ends and loosely install the
upper and lower center mounting fasteners.
8 Position the new bumper support brackets on both ends and loosely install all fasteners.
W8094115
9 Tighten all of the bumper fasteners to specification. See the table below for torque
specifications.
W8094116
Front Bumper Torque Specification
Item
Description
Torque Specificaton
A
14.2 mm (.5625 in) Bolt
189 ± 40 Nm (140 ± 30 ft-lb)
B
15.8 mm (.625 in) Bolt
271 ± 67 Nm (200 ± 50 ft-lb)
Page
6(8)
Mack Trucks, Inc.
Field Service Bulletin
Date
1.2015
Group
No.
Release
861
006
02
Commissioning the Truck for Operation
1 Connect the battery cable to the negative (ground) terminal.
W3086758
2 Remove the wheel chocks.
W7086759
Page
7(8)
Mack Trucks, Inc.
Field Service Bulletin
Date
1.2015
Group
No.
Release
861
006
02
Reimbursement
This repair may be eligible for reimbursement
if a product failure was experienced within
time and mileage limits of the applicable
Warranty coverage. Reimbursement is
obtained via the normal claim handling
process.
UCHP
Reimbursement
eWarranty
Reimbursement
Claim Type (used only when uploading from
the Dealer Bus. Sys.)
01
01
Primary Labor Code (Bumper, Replacement)
8611-03-09-01
0.4 hrs.
6662B-ZU-80
0.4 hrs.
Causal Part
25165882,
25165881
25165882,
25165881
Labor Code
MACK Trucks North America reserves the right to make any changes in design or to make
additions to or upon its products without incurring any obligations to install the same on
vehicles previously built.
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