IK0500038 Service Bulletin/Repair Instructions

IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration
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Document

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IK0500038

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Availability: ISIS, FleetISIS, IsSIR
Revision: 18
Major

System:
STEERING SYSTEM
Created:
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4/18/2019

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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:

04/18/2019 - Updated link to IK1700017 and changed source of tire specs to the service manual

04/12/2019 - Added note for tie rod tube size limits.

01/18/2019 - Added note about only installing high friction bearing on drivers side.

12/05/2018 - Corrected Step 5 diagnostic path steps.

10/19/2018 - Added part numbers and photos



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 IK0400102 and IK1300088.
SERVICE PARTS INFORMATION

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.
Hendrickson Axles ONLY:

Kingpin Service Kit
H60961628
1
Complete kingpin service kit with one high friction

composite thrust bearing for the driver's side
Hendrickson Axles ONLY: Left

Side Kingpin Service Kit
H60961629
1
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 bearings with

seals and wedges.
Kit Description

Steering Stabilizer

Longer Spring U-Bolts
Notes
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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration
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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 first.
No: Please proceed to step 2.
Is this an LT or RH with a constant vibration?
Step Action

DIAGNOSTIC: Tires Pressure and Balance
Decision

Yes: Please 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.

2
Uneven Wear: Check tread depth and note if tread is evenly worn. Minimum tread No: Correct tire pressure, wear and

depth is 3 mm (0.12 in) on front tires and 2 mm (0.08 in) on other tires. Look for cuts balance then re-evaluate for steering

wobble.

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

3
DIAGNOSTIC: Tire Runout

Tire balance and runout are the primary factors in determining the likelihood of

entering a shimmy event
Decision

Yes: Please proceed to step 4.

No: Correct tire run out and reevaluate for

steering wobble.
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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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration
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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?
Step Action

DIAGNOSTIC: Alignment
Decision

Yes: Please proceed to step 5.
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.

4
Is the alignment correctly set?
Step Action

5
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".
No: Set the alignment using IK0200013

and reevaluate for steering wobble.
Decision

Yes: Please proceed to step 6.

No: Replace or adjust the wheel bearings

as needed and reevaluate for steering

wobble.

Refer to ConMet Service Manual
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Is wheel bearing end play in spec?
Step Action

DIAGNOSTIC: Drag Link and Tie Rod End Play
Decision

Yes: Please proceed to step 7.
No: Replace the drag link and tie rod

ends as needed and reevaluate for

steering wobble
6

Use a dial indicator and measure the vertical and horizontal end play of the tie rod

ends and drag link ends.

Spec: less than 0.030 inches.

Are the drag link and tie rod ends within specification?
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.

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

looseness.
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.
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Was anything found loose or damaged?
Step Action
Decision
DIAGNOSTIC: Power Steering System.
Yes: LT/RH refer to 0000885380
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.
Prostar/LoneStar refer to 0000863170
Any issue found?
Correct the power steering system and

reevaluate for the steering wobble.
8

No: Please proceed to step 9.
Step Action
Decision
DIAGNOSTIC: Steering System Lash
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.

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.

No: Please proceed to step 10.

9
Was anything found loose?
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IK0500038 - Steering Shake, Shimmy, Shudder, Steering Vibration
Step Action
Page 6 of 11
Decision
DIAGNOSTIC: King Pin Vertical and Horizontal play
Hendrickson:
Measure the king pin for excessive vertical horizontal end play.
Yes: Install high friction composite kingpin

service kit H60961628 per Hendrickson

manual 59310-011.

No: Install the high friction composite

kingpin bearing only Kit H60961629. If the

service kit is not available 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.
Confirm the type of axle installed and use a dial indicator to verify acceptable play

per supplier's specifications.

Meritor: MM-2
Hendrickson: 17730-252
Reevaluate for a steering shimmy, if

shimmy is still present open a case file

and provide recorded values from each

step.
Is King pin play out of specification?
Meritor 12K:
Dana: AXSM-0038
10
No: Install a steering stabilizer

H60961167 per the below resolution. If tie

rod tube is larger than 1.75inches then

open a tech service case file.
Yes: Install high friction composite kingpin

service kit 2519548C91 per TP1873.

No: Install the high friction composite

kingpin bearing only kit 2520213C91. If

the service kit is not availalble 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.

Meritor 13/14K:

Yes: Install high friction composite kingpin

service kit 2519476C91 per TP1873.

No: Install the high friction composite

kingpin bearing only kit 2520212C91. If

the service kit is not availalble 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.
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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.
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.
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Figure 1: Tie rod assembly

Item 1: Tie rod assembly centerline
Figure 2: Steering Stabilizer to Axle Center Line
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
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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.
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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