IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

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Availability: ISIS, FleetISIS, IsSIR

Revision: 15

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STEERING SYSTEM

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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
Dealers: Please refer to the change log text box below for recent changes to this article:
12/05/2018 ­ Corrected Step 5 diagnostic path steps.
10/19/2018 - Added part numbers and photos
10/02/2018 - Corrected typo and fixed link
09/19/2018 - French and Spanish updated.
8/30/2018 - Update diagnostic formating and resolution for Meritor axles




DESCRIPTION
Steering intermittently goes into a shimmy after hitting a bump.

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 IK1300088.

SERVICE PARTS INFORMATION
Part Number

Quantity
Required

Steering Stabilizer

H60961167

1

For all front axles with 4 inch wide springs

Hendrickson Axles ONLY:
Kingpin Service Kit

H60961628

1

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

Hendrickson Axles ONLY: Left
Side Kingpin Service Kit

H60961629

1

Contains just bushing, seals, bolts and
composite thrust bearing for the drivers side.

Meritor 13-14K Axles ONLY:
Kingpin Service Kit

2519476C91

1

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

Meritor 13-14K Axles ONLY:
Composite Bearing

2520212C91

1

Contains one composite bearings with seals
and wedges.

Meritor 12K Axles ONLY:
Kingpin Service Kit

2519548C91

1

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

Meritor 12K Axles ONLY:
Composite Bearing

2520213C91

1

Contains a composite bearings with seals and
wedges.

Kit Description

Notes

TROUBLESHOOTING

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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

Step Action
DIAGNOSTIC:
If the truck is an LT or RH and has a constant vibration above 50mph follow
IK1700017 first.

Page 2 of 10

Decision
Yes: Refer to IK1700017 first. If
IK1700017 has been completed proceed
to step 2.
No: Please proceed to step 2.

1

Step Action
DIAGNOSTIC: Tires Pressure and Balance

Decision
Yes: Please proceed to step 3.

Underinflated tires can cause poor handling, fast and/or irregular wear, decreased
fuel economy and permanent structural damage to the tire.
Overinflating
reduce
braking
ability and handling, as well as result in
Is
this an LT can
or RH
withtraction,
a constant
vibration?
uneven wear and an uncomfortable ride.
Check front tire's cold inflation pressures daily, for specification refer to owner's
manual.

2

Uneven Wear: Check tread depth and note if tread is evenly worn. Minimum tread
depth is 3 mm (0.12 in) on front tires and 2 mm (0.08 in) on other tires. Look for cuts
or other damage to the tread sidewalls.
Wheel Balance: Ensure tires are properly static and dynamically balanced.
For LT/RH refer to IK1700017 step 14 and 15.

No: Correct tire pressure, wear and
balance then reevaluate for steering
wobble.

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: Tire Runout
Yes: Please proceed to step 4.
Tire balance and runout are the primary factors in determining the likelyhood of
entering a shimmy event
Measure lateral and radial run out on all tires using the tire runout gage RN
4532000. Tire Runout Gage Instructions Navistar PN 4532000

3

No: Correct tire run out and reevaluate for
steering wobble.
Specification:
LT/RH: refer to IK1700017 step 14 and 15.
All other vehicles: lateral and radial run out must be below .065.
Is lateral and radial run out in spec?

Step Action
4

DIAGNOSTIC: Alignment

Decision
Yes: Please proceed to step 5.

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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

Incorrect front axle alignment, specifically toe and caster, has been shown to be
large contrubting factors in increasing the likelyhood of entering a shimmy event.
Before making any changes refer to IK0200023 Navistar Wheel Alignment Policy.

Page 3 of 10

No: Set the alignment using IK0200013
and reevaluate for steering wobble.

Verify alignment using IK0200013-Suggested alignment target values.
Verify that the correct caster refer to TSI–12–02–01.

Is the alignment correctly set?

Step Action
DIAGNOSTIC: Wheel Bearing End Play

Decision
Yes: Please proceed to step 6.

Measure wheel bearing for excessive end play
Use a dial indicator to verify acceptable endplay of 0.001"-0.005".
No: Replace or adjust the wheel bearings
as needed and reevaluate for steering
wobble.
Refer to ConMet Service Manual
5

Is wheel bearing end play in spec?

Step Action

Decision

DIAGNOSTIC: Drag Link and Tie Rod End Play

Yes: Please proceed to step 7.

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

No: Replace the drag link and tie rod
ends as needed and reevaluate for
steering wobble

6

Spec: less than 0.030 inches.
Are the drag link and tie rod ends in spec?

Step Action
7

DIAGNOSTIC: Spring Hangers, Cab Mounts, Engine Mounts and Frame
Fasteners

Decision
Yes: LT/RH refer to 0000885380
Prostar/LoneStar refer to 0000863170

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

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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

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

Page 4 of 10

Repair, torque, or replace fasteners and
suspension components as needed and
reevaluate for steering wobble.
No: Please proceed to step 8.

Confirm fastener torque on all steering system, frame rail and crossmember, and
fuel tank mounting brackets/supports.
Example of a loose fuel tank support.
Step Action
DIAGNOSTIC: Power Steering System.
Determine if the power steering system has the correct fluid type (refer to
IK0500058), it is full of fluid, free of aeration and operating properly.

Decision
Yes: LT/RH refer to 0000885380
Prostar/LoneStar refer to 0000863170
Correct the power steering system and
reevaluate for the steering wobble.

8

Was anything found loose or damaged?

No: Please proceed to step 9.

Any issue found?

Step Action

Decision

Yes: Replace any loose components and
adjust the TRW steering gear lash as
With the engine off and the truck sitting on it tires, inspect for free play in the steering needed per the TRW service manual,
wheel. It should not exceed 2 inches of movement on an 18inch steering wheel with then reevaluate for steering wobble.
no movement in the tires.
DIAGNOSTIC: Steering System Lash

Inspect the steering shaft slip joint and u-joints for looseness.
With a TRW gear: Verify steering gear lash per the TRW service manual.
RH Sheppard gears are not adjustable and should not be tampered with.
9

No: Please proceed to step 10.

Was anything found loose?

Step Action

Decision

10

Hendrickson:
Yes: Install composite kingpin service kit
H60961628 per Hendrickson manual
59310-011.

DIAGNOSTIC: King Pin Vertical and Horizontal play
Measure the king pin for excessive vertical horizontal end play.

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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

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No: Install the high friction composite
kingpin bearing only Kit H60961629. If
the service kit is not avalalble install the
steering stabilizer H60961167 can be
installed in its place per the below
resolution.
Reevaluate for a steering shimmy, if
shimmy is still present open a case file
and provide recorded values from each
step.
Dana:
Yes: Install a king pin service kit and
reevaluate for a steering shimmy.
No: Install a steering stabilizer
H60961167 per the below resolution.
Reevaluate for a steering shimmy, if
shimmy is still present open a case file
and provide recorded values from each
step.
Meritor 12K:
Yes: Install composite kingpin service kit
2519548C91 per TP1873.

Confirm the type of axle installed and use a dial indicator to verify acceptable play
per supplier's specifications.

No: Install the high friction composite
kingpin bearing only kit 2520213C91. If
the service kit is not avalalble install the
steering stabilizer H60961167 can be
installed in its place per the below
resolution.

Meritor: MM-2
Dana: AXSM-0038
Hendrickson: 17730-252

Is King pin play out of spec?

Reevaluate for a steering shimmy, if
shimmy is still present open a case file
and provide recorded values from each
step.
Meritor 13/14K:
Yes: Install composite kingpin service kit
2519476C91 per TP1873.
No: Install the high friction composite
kingpin bearing only kit 2520212C91. If
the service kit is not avalalble the steering
stabilizer H60961167 can be installed in
its place per the below resolution.
Reevaluate for a steering shimmy, if
shimmy is still present open a case file
and provide recorded values from each
step.

RESOLUTION
Steering Stabilizer Installation Procedure:
Only if directed, install the steering stabilizer per the below procedure.

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.

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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

Page 6 of 10

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.

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

1. Bring vehicle into the shop and park on flat hard surface.
2. Shift transmission to Park or Neutral, set parking brake, and install wheel chocks.
3. Remove the front U-bolt from the passenger side steer spring and discard.

Some Meritor and Dana axle configurations may require the mounting bracket (axle side) to be modified to
bend slightly upward to clear the tie rod at full turn, and a longer axle U bolt installed (12 inch obtain locally).
4. On the tie rod assembly, measure the distance between the right and left grease zerks.
5. Divide your measurement from step 4 by two. (This will help locate the centerline of the tie rod assembly)
6. Mark the centerline of the tie rod assembly per figure 1 & 2.

Figure 1: Tie rod assembly
Item 1: Tie rod assembly centerline

Figure 2: Steering Stabilizer to Axle Center Line

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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

Page 7 of 10

7. From the tire rod assembly centerline, make a second mark 5 7/8in towards the driver's side per figure 3. This will be the mounting location of the
tie rod mounting plate.

Figure 3: Tie rod assembly
Item 1: Tie rod assembly centerline (first mark)
Item 2: 5 7/8 from tie rod assembly centerline (second mark)
8. Follow the supplier instructions to attach the hardware for the stabilizer. Hendrickson steering stabilizer assembly instructions 59310-053.

When installing the U-bolts on the tie rod tube do NOT use an impact, or damage to the tie rob tube is
possible.

9. Ensure proper clearance between the tie rod tube and the shock mount at the U-bolt per figure 4. If required modify the mounting bracket to
provide the needed clearance.
10. Before returning the truck to service, the steering system MUST be tested through its full range of travel. Any binding or contact at any point
must be repaired before releasing the vehicle.

The Steering system must be inspected and tested for full range of travel to
confirm there is no binding or contact after the stabilizer has been installed.
Any binding or contact at any point in the full range of travel must be
repaired.

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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration

Page 8 of 10

Figure 4: Tie rod tube to mount clearance

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Figure 5: Assembled Steering Stabilizer

WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.

Standard Repair Time(s):
Refer to the SRT Manual for Repair Times

OTHER RESOURCES
Master Service Information Site
Hendrickson Steering Stabilizer Assembly Instructions 59310-053
Hendrickson Softek, Steertek, Airtek Service Manual 17730­252
Hendrickson Kingpin Bushing Service 59310­011
Hendrickson Parts Catalog SP-182
TRW Service Literature
Meritor Technical Bulletin TP-1873
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