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Knowledge Base Wallaby: ISIS, Bus ISIS, FleetiSIS, IsSIR Revision: 16
System: FRONT AXLE Created: 9/12/2011
Language: English Modified: 3/4/2021
Languages: Frangais, Espafiol, Author: avid

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Title: Suggested alignment target values when performing a vehicle axle alignment

Applies To: Models Except: LT, RH, MV, HV, CV, CE Bus

CHANGE LOG

Please refer to the change log text box below for recent changes to this article:

03/04/2021 - Excluded LT, RH, MV, HV, CV, CE Bus from this article

01/21/2020 - Correct Hyperlink

08/22/2019 - Update author for feedback

05/20/2019 - Updated formatting, added part numbers, links to manuals and added note about radar alignments and SAS cal
08/02/2018 - Corrected typo

DESCRIPTION

A proper vehicle alignment will maximize tire life and driving comfort. However, the alignment should not drift
overtime under normal operating conditions. If there is a repair performed on the suspension or an accident
the alignment should be checked and adjusted as needed.

NOTE: This article does not apply to LT, RH, MV, HV, CV, CE Bus or newer product lines. Information
for those vehicle platforms resides in the Diagnostic & Service Manuals for each respective model.
This article will no longer be maintained or updated as of 3/4/2021.

SYMPTOMS

Some indications of the need for an alignment may include a drift or pull while driving or abnormal tire wear.

Ensure the ride height is set correctly on air suspensions before checking or adjusting any alignment
measurements. Please refer to the appropriate service manual for setting the ride height

SERVICE PARTS INFORMATION

Park vehicle on a hard, flat surface, turn the engine off, set the parking brake, and block
the wheels to prevent the vehicle from moving in either direction. Failure to do so may
result in property damage, personal injury, and / or death.

If the vehicle must be raised, do not work under the vehicle supported only by jacks.
Jacks can slip or fall over, potentially resulting in property damage, personal injury, and /
or death.

FN

Description | Part Number | Required I Size
| 0.5 Degree Caster Shim || 89500HA || As needed | 2.75 x 5.75
1.0 Degree Caster Shim | 520339C2 | As needed | 2.75 x 5.75 |
| 2.0 Degree Caster Shim || 92825HA || As needed | 2.75 x 5.75
| 3.0 Degree Caster Shim || 63656R2 || As needed || 2.75 x 5.75
[0.5 Degree Caster Shim || 471170C1 || As needed | 3.75 x 6.8
| 1.0 Degree Caster Shim || 692453R1 || As needed | 3.75x68
| 1.3 Degree Caster Shim || 692454R1 || As needed [3.75x68 |
| 2.0 Degree Caster Shim || 692455R1 || As needed | 3.75x68
| 2.75 Degree Caster Shim || 1654036C1 || As needed | 3.75x69
| 3.0 Degree Caster Shim || 2015313¢1 || As needed | 3.75 x 6.8
| 3.5 Degree Caster Shim || 2020883¢1 || As needed | 3.75x68
| 4-0 Degree Caster Shim || 2015314C1 || As needed [3.75x 6.8
0.010 Inch Rear Axle Shim 1516023C1 As needed
| 0.033 Inch Rear Axle Shim || 488917C1 || As needed I
| 0.056 Inch Rear Axle Shim || 488916C1 || As needed I
[0.119 Inch Rear Axle Shim || 590752C1 || As needed I
RESOLUTION

Always wear safe eye protection when performing vehicle maintenance. Failure to do so
may result in personal injury and / or death.

Refer to IKO200023 - Navistar Wheel Alignment Policy before performing any alignments to vehicles under
warranty.

For front axle alignments please refer to SO2001K Steering General Service Information and Front Wheel
Alignment manual.

For rear axle alignments please refer to SO3003 Suspension Alignment manual.
In Service Specifications:

Steering Axle

Minimum Maximum Unit
Toe in .00 18 Degrees
.00" 125" Inches
0 1/8" Fractions
.00 3.19 Millimeter
.00 3.14 mm/M
Rear Axles
Minimum Maximum Unit
Thrust -.18 18 Degrees
-.250" .250" Inches
6.4 64 Millimeter
-3.1 3.1 mm/M
Tram/Scrub -.08 .08 Degrees
-.125 125 Inches
-3.2 3.2 Millimeter
-1.4 14 mm/M
NOTES:

Due to variation in equipment and measuring techniques do NOT make any
adjustments if the initial readings are inside the "In Service Specifications".

NOTES:

Negative degree tolerance denotes left tire behind right
(Josam alignment equipment inverse).

NOTES:
[For caster and camber specifications refer to S02001K |

If out of "In Service Specifications" re-adjust to below target values:

Steering Axle

Minimum Maximum Unit
Toe in 0.03 0.09 Degrees
0.021" 0.063" Inches
1/32 1/16 Fractions
0.54 1.60 Millimeter
0.54 1.62 mm/M
Rear Axles
Minimum Maximum Unit
Thrust -0.05 0.05 Degrees
-0.084" 0.084" Inches
-2.13 2.13 Millimeter
-0.9 0.9 mm/M
Tram/Scrub -.08 0.00 Degrees
-.125 0.000 Inches
-3.2 0.0 Millimeter
-1.4 0.0 mm/M
NOTES:

Negative degree tolerance denotes left tire behind right
(Josam alignment equipment inverse).
NOTES:

On vehicles equipped with forward radar. The radar alignment procedure
should be followed anytime the rear axles are adjusted. (Refer to the radar
manufacturer for this procedure.)

NOTES:

On vehicles equipped with ESC. The steering wheel angle sensor
calibration should be performed anytime the toe is adjusted. (Refer to
the ABS manufacturer for this procedure.)

NOTES: