CAL WST 32-002

Daimler Trucks
North America LLC
Customer Advisory Letter
11/20/1019
CAL WST 32-002
Subject: Airliner Welded Axle Seats
Models Affected: 2019 and 2020 model year Western Star 4700,
5700XE, and 4900SB vehicles
Our records indicate that you are the owner of one or more vehicles with the following serial numbers: LZ5038,
KF5745, KE4625, KE4626, KT8800, KT8801, LJ8467.
The Airliner rear suspension welded axle seats were installed incorrectly on the rear most drive axle on these
vehicles, resulting in an incorrect axle pinion angle.
The existing welded axle seats will be removed and replaced with new axle seats installed in the correct
orientation.
Please see the attached communication.
Page 1
Customer Advisory Letter
Daimler Trucks
North America LLC
11/19/2019
CAL WST 32-002
Work Instructions
Subject: Airliner Welded Axle Seats
Models Affected: 2019 and 2020 model year Western Star 4700,
5700XE, and 4900SB vehicles
Parts
Parts
Part Number
Part Description
Quantity
11-17531-000
11-23853-003
23-00461-007
SEAT,A/L,WLD,3.0D
U BOLT,7/8-14,400,154/50,90
NUT-HEX,HI,7/8-14,C,TX,1.17
2
4
8
23-09114-005
WASHER-HRDN,0.94X1.75X.177
8
Table 1, Parts Table
Work Instructions
1.
Park the vehicle, shut down the engine, and apply the parking brakes. Chock the steer axle tires and the
rear rear drive axle tires.
2.
Dump the air from the Airliner rear suspension air springs.
3.
Raise the truck and support the back of the frame rails with appropriate support stands. Make sure the
tires are still touching the ground.
4.
Remove both air springs on the rear rear drive axle. See Section 32 in the Western Star Workshop
Manual for instructions.
5.
Disconnect the shock absorbers from the leaf springs on the rear rear drive axle.
6.
Remove both of the Airliner leaf springs on the rear rear drive axle.
7.
Locate the welded axles located on the bottom of the axle housing. See Fig. 1.
1
11/13/2019
f350690
1. Axel Seat
Fig. 1, Airliner Suspension Rear Rear Drive Axle
8.
Cut off the existing left-hand and right-hand axle seats.
IMPORTANT: Remove the welds with minimal grinding on the axle housing.
Page 2
Customer Advisory Letter
Daimler Trucks
North America LLC
11/19/2019
CAL WST 32-002
9.
Use a disc grinder to grind out the welds and remove the axle seats. Discard the axle seats.
10.
Remove any weld residue, ridges, or ripples from the surface of the housing. Do not leave gouges or
sharp edges on any surface. All areas must be flat with the housing wall and bracket.
11.
Grind off the outer coating on the welding surfaces of the new axle seats.
12.
Locate the center of the new axle seat 6.57 inches (166.85 mm) from the inside of the brake flange with
the thick side of the axle seat located on the forward side of the axle housing. See Fig. 2 and Fig. 3.
12mm
12mm
2X
166.85
1028.7
166.85
11/15/2019
f350691
Fig. 2, Locating the Center of the New Axle Seat
28.9 mm
A
3°
11/15/2019
f350689
A. Thick Side of Axle Seat
Fig. 3, Axle Seat
IMPORTANT: Any welding must be done by a certified welder.
13.
Complete the .5 inch (12 mm) weld. See Fig. 2
14.
Install the leaf springs. See Section 32 in the Western Star Workshop Manual for full instructions on installing the leaf springs. Torque the U-bolts as specified in the Western Star Workshop Manual in Subject 32.04.400.
15.
Install the shock absorbers.
Page 3
Customer Advisory Letter
Daimler Trucks
North America LLC
11/19/2019
CAL WST 32-002
16.
Install the air springs.
17.
Align the truck.
Warranty
This procedure is warrantable only if the described condition exists and the repair is performed within the
applicable base or extended coverage warranty period. If a failure is not found, this procedure is considered
preventive and warranty does not apply.
Normal warranty applies. See Table 2 for OWL VMRS codes and labor allowance information. Enter this CAL
bulletin number in the claim story as you would do for a Service Bulletin warranty claim.
Primary Failed Part
11-17531-000
OWL VMRS Codes and Labor Allowance
Component Cause Code Correction
Description
Code
Code
016-009-018
28
03
AXLE SEATS, REAR AXLE
Table 2, OWL VMRS Codes and Labor Allowance
Page 4
Time: Hours
5.0