IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

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IK0500038
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Availability: ISIS, FleetISIS, IsSIR

Revision: 23

Major
System:

STEERING SYSTEM

Created:

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Last
9/18/2019
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8/15/2011

Charles
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Title : Steering Shake, Shimmy, Shudder, Steering Vibration
Applies To : Prostar/Lonestar and LT/RH 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:
09/18/2019 - Updated tread depth to mm and 32nds, removed decimal reading. Added part number for replacement rear engine mount for X15 powered
vehicles. Combined steps 2-3 to include all wheel/tire checks at one step.
08/22/2019 - Added production break dates/ Updated author for feedback
07/22/2019 - Update link to IK1700017
06/10/2019 - Added part number for Dana high friction bearing kit and updated diag steps to reflect this.

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

SYMPTOMS
• 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 symptom with consistent shimmy when braking. Refer to IK0400102 and IK1300088.

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

L or N VINs ( LL851830 / LN168676 )

Meritor:

08/12/2019 all other PN as Springfield plant

H VINs ( KH081197 )

Dana:

08/12/2019

Kit Description
Steering Stabilizer
Longer Spring U-Bolts
Hendrickson Axles ONLY:
Kingpin Service Kit

Part Number

Quantity
Required

H60961167

1

For all front axles with 4 inch wide springs and tie
rod tubes of 1.75 inches or smaller in diameter.

Source Locally

2

Needed on some applications to install the
steering stabilizer.

H60961628

1

Complete kingpin service kit with one high friction
composite thrust bearing for the driver's side

H60961629

1

Notes

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10/2/2019

IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

Hendrickson Axles ONLY: Left
Side Kingpin Service Kit

Page 2 of 11

Contains just bushing, seals, bolts and high
friction composite thrust bearing for the driver's
side.

Meritor 13-14K Axles ONLY:
Kingpin Service Kit

2519476C91

1

Complete kingpin service kit with one high friction
composite thrust bearing for the driver's side

Meritor 13-14K Axles ONLY:
Composite Bearing

2520212C91

1

Contains one high friction composite bearings with
seals and wedges.

Meritor 12K Axles ONLY: Kingpin
Service Kit

2519548C91

1

Complete kingpin service kit with one high
friction composite thrust bearing for the driver's
side

Meritor 12K Axles ONLY:
Composite Bearing

2520213C91

1

Contains a high friction composite bearing with
seals and wedges.

Dana Axles Only: Left Side
Composite Bearing

2520702C91

1

Contains one high friction composite bearing,
wedges and lash shims.

Rear Engine Mount

1664729C7

2

For vehicles with Cummins X15 only.
Do not use in A26 powered vehicles.

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.

TROUBLESHOOTING
Step Action

Decision
Yes:
Refer to IK1700017 first.
If IK1700017 has been completed
proceed to step 2.

DIAGNOSTIC:
1

If the truck is an LT or RH and has a constant vibration above 50mph follow
IK1700017 and the LT service manual first.

No: Please proceed to step 2.

Is this an LT or RH with a constant vibration?

Step Action
2

DIAGNOSTIC: Tire Pressure, Runout and Balance
Tire balance and runout are the primary factors in determining the likelihood of
entering a shimmy event

Decision
Yes: Please proceed to step 3.
No: Correct tire pressure, wear, runout
and balance then proceed to step 3.

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

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10/2/2019

IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

Page 3 of 11

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.
For LoneStar LT/RH refer to the Truck Service Manual 0000885380.
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
DIAGNOSTIC: Alignment

Decision
Yes: Please proceed to step 4.

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 IK0200023 Navistar Wheel Alignment Policy.
Verify alignment using IK0200013-Suggested alignment target values.
Verify that the correct caster refer to TSI–12–02–01.
3

Is the alignment correctly set?

Step Action
4

DIAGNOSTIC: Wheel Bearing End Play

No: Set the alignment using IK0200013
and proceed to step 4.

Decision
Yes: Please proceed to step 5.

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