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M Availability: ISIS, FleetiSIS, IsSIR Revision: 30
Major
: STEERING SYSTEM Created: 8/15/2011
Knowledge Base oem
urrent . Last
Language: English Moditiea: 2/15/2021
Other : ~ Mark
Languages: Fiansais, Espafiol, Author: filers
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Title: Steering Shake, Shimmy, Shudder, wobble, Steering Vibration

Applies To:LT/RH & Prostar/Lonestar with 14k front weight rated axles and below

CHANGE LOG

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

(03/1 5/2021 - Updated symptom section with more information and a video. 1
112/08/2020 - Requested translation to French and Spanish to ensure all versions have the same content. 1
106/18/2020 - Added additional information to notes. Full king pin kit should not be installed, only the composite bearing on the driver's side. I
,03/03/2020 - Fixed hyperlink. No content changes. t
112/03/2019 - Updated layout. Added additonal notes regarding steering stabilizer installation. High friction bearing and rear engine mounts should be installed first, I

DESCRIPTION

Steering intermittently goes into a shimmy after hitting a bump or during a curve.

SYMPTOMS

e The steering system may go into a shimmy after hitting a bump or during a curve. Normally the vehicle speed will need to be reduced in order to
stop the shimmy. The symptoms may include a lateral (side to side) shake and possible oscillation of the steering wheel.
© Do not confuse this with a consistent vibration at speeds above 58 mph.

o The shimmy that this article addesses looks like . or this
o Use this video to help verify the exact symptom with the driver.
¢ Do not confuse this symptom with consistent shimmy when braking. Refer to |IK0400102 and IK1300088.

(same video but different format).

SERVICE PARTS INFORMATION

Note:

The high friction composite thrust bearing was added to production on the below dates:
Hendrickson: ||02/25/2019
Meritor: 02/04/2019 for PN 3899618C93, 3899622C94, 3899619C94, 3610259C94 and 3899623C94
Meritor: 07/08/2019 all other PN at Escobedo plant Lor N VINs (LL851830 / LN168676 )
Meritor: 08/12/2019 all other PN at Springfield plant H VINs (KH081197 )

|| Dana: ||08/12/2019

Note:

If installed, only one high friction composite king pin bearing should be installed per vehicle and it
should be installed on the driver's side.

If a composite bearing is avaible, it should be ordered and not a full kit. If a full kit must be ordered,
only the composite bearing should be installed on the driver's side. This does not cover replacing the
passenger side king pin bearing and will not be covered by warranty.

Note:

Rear engine mount 1114729C7 was added to production on X15 powered LT on the below dates:

10/07/2019 at Escobedo plant

Lor N VINs (LL851830 / LN168676 )

11/11/2019 at Springfield plant

H VINs ( KH081197 )

. we Quantity
Kit Description Part Number Required Notes
: For vehicles with Cummins X15 only.
Rear Engine Mount 166472907 2 Do not use in A26 powered vehicles.
Complete kingpin service kit with one high friction
Hendrickson Axles ONLY: H60961628 1 composite thrust bearing for the driver's side
Kingpin Service Kit Only use if H60961629 is not available
Only service the bearing on the driver's side
. . Contains just bushing, seals, bolts and high
Hendrickson Axles ONLY: Left an : : a
Side Kingpin Service Kit H60961629 1 freon composite thrust bearing for the driver's
Complete kingpin service kit with one high friction
Meritor 13-14K Axles ONLY: 2519476C91 1 composite thrust bearing for the driver's side
Kingpin Service Kit Only use if 2520212C91 is not available
Only service the bearing on the driver's side
Meritor 13-14K Axles ONLY: 2520212091 1 Contains one high friction composite bearings with
Composite Bearing seals and wedges.
Complete kingpin service kit with one high
Meritor 12K Axles ONLY: Kingpin 9519548C91 ' freon composite thrust bearing for the driver's
Service Kit Only use if 2520213C91 is not available
Only service the bearing on the driver's side
Meritor 12K Axles ONLY: Contains a high friction composite bearing with
Composite Bearing 2520213091 1 seals and wedges.
Dana Axles Only: Left Side Contains one high friction composite bearing,
Composite Bearing 2520702C91 1 wedges and lash shims.
Only if needed: High friction bearing, and rear
engine mounts will correct nearly all vehicles
Steering Stabilizer H60961167 1
For all front axles with 4 inch wide springs and tie
rod tubes of 1.75 inches or smaller in diameter.
: Needed on some applications to install the
Longer Spring U-Bolts Source Locally 2 steering stabilizer.

TROUBLESHOOTING
Step/Action |Decision
1 |DIAGNOSTIC: Yes:

Is this an LT or RH with a constant vibration?

Refer to |K1700017 first.

If the truck is an LT or RH and has a constant vibration above 50mph follow

1K1700017 and the LT service manual first. If IK1700017 has been completed

proceed to step 2.

No: Please proceed to step 2.

Step/Action

Decision

2 |DIAGNOSTIC: Tire Pressure, Runout and Balance

Tire balance and runout are the primary factors in determining the likelihood of
lentering a shimmy event

Under-inflated tires can cause poor handling, fast and/or irregular wear, decreased
fuel economy and permanent structural damage to the tire.

Overinflating can reduce traction, braking ability and handling, as well as result in
uneven wear and an uncomfortable ride.

Check front tire's cold inflation pressures daily, for specification refer to owner's
manual.

Measure lateral and radial run out on all tires using the tire runout gage RN
4532000. Tire Runout Gage Instructions Navistar PN 4532000

Specification:
|LoneStar LT/RH refer to the Truck Service Manual 0000885380.
All other vehicles: lateral and radial run out must be below .065".

Is lateral and radial run out within specification?

Uneven Wear: Check tread depth and note if tread is evenly worn. Minimum tread

depth is 3 mm (4/32) on front tires and 2 mm (3/32) on other tires. Look for cuts or
other damage to the tread sidewalls.

Wheel Balance: Ensure tires are properly static and dynamically balanced.

ro" LoneStar LT/RH refer to the Truck Service Manual 0000885380.

Yes: Please proceed to step 3.

No: Correct tire pressure, wear, runout
land balance then proceed to step 3.

Use the Tire Data Recording document to record your findings
Note: Retreads are not recommended as a steer axle tire.

Do the tires meet the above criteria?

Step|Action

Decision

DIAGNOSTIC: Alignment

Incorrect front axle alignment, specifically toe and caster, has been shown to be
large contributing factors in increasing the likelihood of entering a shimmy event.

Before making any changes refer to |KO200023 Navistar Wheel Alignment Policy.
Verify alignment using IKO200013-Suggested alignment target values.
Verify that the correct caster refer to TSI-12—02-—01.

3 |/Is the alignment correctly set?

Yes: Please proceed to step 4.

No: Set the alignment using |KO200013
land proceed to step 4.

Step/Action

Decision

DIAGNOSTIC: Wheel Bearing End Play
Measure wheel bearing for excessive end play

Use a dial indicator to verify acceptable endplay of 0.001"-0.005".

Yes: Please proceed to step 5.

No: Replace or adjust the wheel bearings
las needed and proceed to step 5.

Refer to ConMet Service Manual

4
DIAL
INDICATOR
Is wheel bearing end play in spec?
Step/Action Decision

5 |DIAGNOSTIC: Drag Link and Tie Rod End Play

Use a dial indicator and measure the vertical and horizontal end play of the tie rod
lends and drag link ends.

Spec: less than 0.030 inches.

Yes: Please proceed to step 6.

No: Replace the drag link and tie rod
lends as needed and proceed to step 6.

Are the drag link and tie rod ends within specification?

Step/Action Decision
DIAGNOSTIC: Spring Hangers, Cab Mounts, Engine Mounts and Frame Yes: LT/RH refer to 0000885380
Fasteners

The rear engine mounts on X15 powered vehicles need to be replaced
regarless of condition, if it was not built with 1664729C7 - Refer to Service
Parts Information

torque.
Inspect cab and engine mounts for excessive wear, being degraded and/or
looseness.

Failed engine mount
Inspection may
require a mirror

Confirm fastener torque on all steering system, frame rail and crossmember, and
fuel tank mounting brackets/supports.

Example of a loose fuel tank support.

Gap and signs of
movement
indicate improper
torque

Was anything found loose or damaged?

Inspect the spring hangers, shackles, and bushing for looseness, play and fastener

Prostar/LoneStar refer to 0000863170

Repair, torque, or replace fasteners and
suspension components as needed and
proceed to step 7.

For A26 powered LT, the rear engine
mounts should be replaced with a new
part from the parts catalog if damage if
found.

For X15 powered LT, the rear engine
mount should be replaced with
1664729C7 regardless if damage is
found.