FSB 511-009

Field Service Bulletin
Trucks
Mack Trucks, Inc.
Greensboro, NC USA
Date
Group
No.
Release
Page
8.2014
511
009
01
1(12)
Brake Drum, Replacement
Steer Axle
CHU, CXU, GU, TD
FSB 511-009, Brake Drum, Replacement (Steer
Axle)
(August 2014)
Some MACK CHU, CXU, GU, and TD trucks built between 08/29/2011 and 06/30/2014,
equipped with a 14.6k steer axle, and 152 mm (6.0 in) wide Meritor or Bendix brake shoes
can show signs of brake shoe protrusion beyond the brake drum. This condition is resolved
by installing new 152 mm (6.0 in) brake shoes, and new 178 mm (7.0 in) wide brake drums
(20536276).
Note: This bulletin does not apply to MACK Trucks Australia.
W5092782
Required Parts (Brake Drum Replacement)
Item
Description
Part Number
Qty
1
Brake Drum, 178 mm (7.0 in) wide
20536276
2
2
Meritor Brake Shoe Kit, 152 mm (6.0 in)
8235-KSMA15014715QP
2
3
Bendix Brake Shoe Kit, 152 mm (6.0 in)
745-K097965
2
PV729-FSB511-009_M
USA66350
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
Decommissioning the Truck for Repair
You must read and understand the precautions and guidelines in Service Information,
group 50, "General Safety Practices, Brakes" 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
Page
2(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
5 Disconnect the cable from the battery’s negative terminal.
W3086747
Brake Drum, Replacement, Meritor/Bendix (0.9 hrs)
Note: The left side is shown for instructional purposes.
1 Lift the steer axle with a jack, place the truck on jack stands, and remove the jack.
2 Remove the wheel nuts.
W5092265
Page
3(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
3 Remove the wheel.
W5092266
4 Remove the slack adjuster pawl.
Note: The Meritor slack adjuster is shown in this procedure for backing off the brakes.
However, this procedure is similar for other brands.
Note: For Gunite slack adjuster backing off of the bake procedures, go to step 6.
W5092669
Page
4(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
5 Back off of the brake (slack adjuster).
W5092670
6 Back of the brake (slack adjuster).
Note: The Gunite slack adjuster is shown in this procedure for backing off the brakes.
However, this procedure is similar for other brands.
W5092783
Page
5(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
7 Remove the brake drum.
Note: Discard the brake drum.
W5092271
8 Remove the brake shoes, brake springs, and rollers.
W5092272
Page
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Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
9 Install the replacement brake shoes, springs and rollers.
Note: The brake springs and rollers are included in the brake shoe kit.
W5092272
10 Install the replacement brake drum (178 mm (7.0 in) wide). See the table on page 1 for the
correct part number.
W5092276
Page
7(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
11 If applicable, loosen the brake chamber clamp and re-position the clamp at a 45° angle or
until proper clearance of the wheel is obtained. See figure below.
Note: Do not rotate the brake chamber. Rotate the clamp only.
Note: Ensure the brake chamber clamp does not interfere with the drum.
12 If applicable, tighten the brake chamber clamp fastener to 44 ± 4 Nm (32 ± 3 ft-lb).
W5092784
13 Install the wheel.
W5092266
Page
8(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
14 Install the wheel nuts.
15 Tighten the wheel nuts to 610 Nm (450 ft-lb).
W5092265
16 Adjust the brake as recommended per (slack adjuster) manufacturer.
Note: The Meritor slack adjuster is shown in this procedure for adjusting the brake.
However, this procedure is similar for other brands.
Note: For Gunite brake adjustment procedures, go to step 19.
W5092670
Page
9(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
17 Install the slack adjuster pawl.
18 Tighten the slack adjuster pawl to 21 ± 3 Nm (186 ± 30 in-lb).
W5092669
19 Adjust the brake as recommended per (slack adjuster) manufacturer.
Note: The Gunite slack adjuster is shown in this procedure for adjusting the brake.
However, this procedure is similar for other brands.
W5092783
Page
10(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
20 Repeat steps 1 through 19 for the right side of the truck.
21 Lift the steer axle with a jack, remove the jack stands, and lower the axle.
22 Go to Commissioning the Truck for Operation.
Commissioning the Truck for Operation
1 Connect the battery cable to the negative (ground) terminal.
W3086758
2 Remove the wheel chocks.
W7086759
Page
11(12)
Mack Trucks, Inc.
Field Service Bulletin
Date
8.2014
Group
No.
Release
511
009
01
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 (Brake Drum, Replacement)
5112-03-09-08
0.9 hrs.
5126C–01–80
0.9 hrs.
Causal Part
25017906
25017906
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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