IK1700017 ­ LT vibration at highway speeds

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Countries:

CANADA, UNITED STATES Document ID: IK1700017

Availability:

ISIS, FleetISIS, NotSIR

Revision:

13

Major System:

WHEELS

Created:

9/19/2017

Current Language: English

Last Modified: 2/2/2018

Other Languages: NONE

Author:

Viewed:

Mark Ehlers

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Title : LT vibration at highway speeds
Applies To : LT Series

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
02/02/2018- Removed carrier bearing info
01/30/2018- Revised title and "applies to"; removed build dates, added tips
12/14/2017 - Added a 1 page instruction document on how the road force balancing procedure is to be and added the complete manual for the road
rodrce machine to the other resources section.
11/07/2017- Add link to IK0600020 "Determine Wheel Speed or Driveline Vibration using a Smart Phone and Free VibSensor Application"
10/30/2017 ­ Reformat to step based. Reordered and steps.
10/13/2017- Added inspect for driveshaft balance weights present
10/09/2017­ Added sheet for tire shop to use
10/05/2017- improved links, added tire flat-spot inspection, added torque arm
09/29/2017 - Initial Article Release

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DESCRIPTION
This article applies to LT vehicles that experience an objectionable vibration felt in the seat, floor, or the steering wheel.

SYMPTOM(s)
An objectionable vibration is felt in the seat, floor, or the steering wheel. Mirror shaking might also occur.

SPECIAL TOOL(s) / SOFTWARE
Tool Description

Tool Number

Tire runout gauge

4532000

Comments

Instructions

with VibSensor ap

IK0600020

Tire pressure gauge
Tire marker / grease
pen
masking tape
Smartphone
Tools Resource Center

SERVICE PARTS INFORMATION
Kit Description

Part Number

Quantity
Notes
Required

KIT U-JT BOLT & RET SPL-250

2500675C91

as needed

DIAGNOSTICS

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IK1700017 ­ LT vibration at highway speeds

Step Action
DIAGNOSTIC:
1

Page 2 of 8

Decision
Yes. Go to Step 2

Does the LT have a validated objectionable highway speed (45 mph+) vibration
(and not at lower speeds)?
No. Article does not Apply

Step Action
DIAGNOSTIC:

Determine the location of the Vibration

2

Decision
A steering wheel "buzz" sensation in your
hands is often driveline related. Go to
Step 3
A "backslap" sensation in the seat is often
rear wheels balance / runout related. Go
to Step 11.
Smartphones with a free App have proven
very accurage in determining if the
vibration source is wheel related or
driveline related. See IK0600020. If
unable to determine the location or source
of the vibration, Go to Step 3

Step Action

Decision

3

1.
Up and down indicates run-out or
imbalance or both .
If it gets worse as speed increases its
often balance related.
If vibration changes when vehicle is put in
neutral OR clutch is depressed (during the
vibration) then accelerate ABOVE the
vibration speed so that you can coast
down through the speed region of the
vibration. Vibrations that change when
clutch is depressed (or transmission is in
neutral) are likely driveline related.
Proceed to step 6.

DIAGNOSTIC:
Determine the type of vibration

2.
Side to side indicates run-out, balance
and possibly irregular wear.

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IK1700017 ­ LT vibration at highway speeds

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Steering wheel shimmy often indicates
steer tire dynamic imbalance.
Up and down indicates run-out or
imbalance or both.
If it gets worse as speed increases its
often balance related.
If it occurs at only one speed it is often
run-out related.
Proceed to tires step 10.
3. Low speed wobble is not a balance
problem.
A vibration while braking only indicates a
brake system problem.
Proceed to Other Resources section for
additional help.

Were you able to identify the source of the vibration?

Figure 1: Typical LT Axle Setup
Item 1:Slip joint section of prop shaft.
Item 2: Indexing marks added by the technician.

It is ok for the bellows to point in either direction.

Step Action
DIAGNOSTIC:

6

Clearly mark the driveshaft for phasing purposes. (See Figure 1) Flip
the long shaft (Item 2) 180 degrees so that the slip shaft section of the
driveline is closer to the rear axle. (see Figure 2). When installing, make
sure your phasing marks still line up as in Figure 1 & 2. Test drive. Is the
vibration better but still objectionable?

Decision
Yes, vibration is better but still
objectionable: Go to Step 7
No, Vibration is gone: Return unit
to customer, End
dagnostics
No change at all: Proceed
to Step 10

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IK1700017 ­ LT vibration at highway speeds

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Figure 2: Prop Shaft Flipped
Item 1: Slip joint section of prop shaft.
Item 2: Indexing marks added by the technician stil lined up.

It is ok for the bellows to point in either direction.

Step Action
DIAGNOSTIC:
7.

Decision
Yes. Go to Step 8.

No:
Rotate long drive shaft so that the phasing marks are now 180 degrees apart from End diagnostics and return to service.
each other. Road test and determine if vibration is stil objectionable.
No change in vibration:
Go to Step 9

Step Action
8.

Step Action
DIAGNOSTIC:

9

Decision

DIAGNOSTIC:
Yes.
Disconnect the long shaft at the rear differential. Rotate shaft assembly 180 degrees Go to Step 9.
at the differential yolk. Re-install and road test. Is the vibration still objectionable? No. End diagnostics and return to service.

Decision
Yes. Proceed to the driveline resource
center document in the Other Resources
section of this article.

Only follow this action if you know that you have a vibration that is caused
by the driveline.
Reference Navistar Driveshaft Balance Requirements
Print out the balance requirements specifications and take with you to your
local drive line store. Have them build a new shaft to the specifications listed
in the sheet. Make sure they use new yolks and U‐joints. Do not re‐use any
part of the driveshaft. Send the #1 drive shaft out as well for balancing. If the
driveshaft will mark the high spots on both shafts that would help with install.
When re‐installing the shafts make sure the high spots of the 2 shafts are 180 No. Return to service.
degrees from each other. Or make sure the balance weights are 180 degrees
from each other and not on the same plane.
After shafts are installed, road test and determine if the vibation is still
present.

Step Action
10 DIAGNOSTIC:

Decision
Yes. Go to Step 11

Check pressures on all tires. Are both steer tires and all drive tires within 5 psi
of each other?

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IK1700017 ­ LT vibration at highway speeds

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No. Correct the air pressure and test

drive. If vibration concern is not
resolved, go to Step 12. If resolved, end
procedure and return unit to customer.

Step Action
DIAGNOSTIC:

Check the tightness of the torque arm fasteners, See Figure 3. It may be
11 located behind the cab. Are the fasteners tight?

Decision
Yes. Go to Step 12
No. Torque fasteners. Test drive to see if
complaint is resolved. If resolved, End
Procedure and return unit to customer. If
not, go to Step 12

Figure 3: Torque Arm Fastener
Item 1: Torque Rod Bolt
Item 2: Torque Rod Nut
Item 3: Torque Rod

A loose torque rod or cross member can transmit a vibration produced from the driveline or tires and
exaggerate the feel in the cab. Always make sure all joints with bolts on the truck are tight and torqued to
spec.

Step Action
DIAGNOSTIC:

12

Inspect each tire for flat spotting caused by a brake lock‐up event. Are flat
spots present?

Decision
Yes. Replace any wheel/tire assemblies
with an identical sized assembly from a
donor truck and repeat test drive. If
vibration concern is resolved, end
Procedure and return unit to customer.
No. Go to Step 13

Step Action
13 DIAGNOSTIC:

Check suspension ride height by measuring on the same axle and side as the
leveling valve is located.

Decision
Yes. Go to Step 14
No. Adjust ride height per Technician
Manual. Retest to see if vibration is still

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IK1700017 ­ LT vibration at highway speeds

To properly perfrom this operation, ease the truck into the bay and apply
wheel chocks. Do not set the parking brake and do not come to an abrupt
stop. Make sure there is over 100 psi of air in the tank. Deflate the suspension
all the way, than reinflate. Verify pressure is again above 100 psi. Measure
from the top of the axle to the bottom of the frame rail. This measurement
should be 6 1/2".

Page 6 of 8

present. If still present, go to Step 14. If
vibration conern is resolved, end
Procedure and return unit to customer.

Is ride height adjusted properly?

Prior to performing any type of balance procedure on the vehicle always refer to
the lineset ticket and verify how the truck was ordered.

0029TAK ‐ Yellow dot aligned to valve stem
0029TAG ‐ Unidirectional tires
0029TAD ‐ Do Not Balance (contact your CSE for direction on repair)

Step Action
DIAGNOSTIC:

Use Hunter Engineering locator tool http://www.hunter.com/heavy‐
duty/forcematch‐hd/search to see if a ForceMatch HD wheel balancer is in
your immediate area. Is a wheel balancer nearby?
Note: For run-out problems, the matchmounting procedure is often an effective
method to eliminate the concern. Matchmounting isolates the tire, wheel, and bolt
circle of the wheel to determine where the problem may be. It can also determine if a
combination of variables is responsible because the tolerances “stack” to create an
unacceptable condition. Since all tires and wheels are likely to have some run­out
and all bolt circles are not perfectly centered, it is important that these factors do not
“add up” to create a ride vibration even when individual components are within spec.

Decision
Yes. Have all wheels rebalanced and
check radial runout on Hunter ForceMatch
HD Machine. Rotate tire on the rim to
achieve .040" or less runtout on all
wheels. Ask tire shop to provide the
before and after runout value for each tire.
Enter the information in a Case File if one
is open.
PRINT Tire Shop Worksheet
Mark the peak point of runout on each tire
so it can be properly oriented when
installed on the truck
Road Force Balance Highlights
Go to Step 15

14

No. At a commercial tire shop, have all
wheels rebalanced and check radial
runout on the balance machine.
Dismount tire as needed and rotate on the
rim to reduce runout as needed.
Match Mounting Instructions
PRINT Tire Shop Worksheet
Mark the peak point of runout on each tire
so it can be properly oriented when
installed on the truck
Go to Step 15

Step Action

Decision

15 DIAGNOSTIC:

Reinstall front tires with the point of peak runout at the top (12 o'clock). Install Yes. Follow IK1400005 Driveline
the front tire with the least runout on the driver's side. Do not use any
Information Center and Troubleshooting
Procedures
centering devices.
Reinstall rear tires with the points of peak runout 180 degrees from each
other, see Figure 4.

No. Procedure complete.

Retest. Is Vibration still present?

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IK1700017 ­ LT vibration at highway speeds

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Figure 4 - Example of match mounting
Identify the high spots of both tires on the dual and make sure those high
spots are 180 degrees from each other when installing on the truck.

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
TBD

OTHER RESOURCES
IK0600020 Determine Wheel Speed or Driveline Vibration using a Smart Phone and Free VibSensor Application
IK1400005 Driveline Information Center and Troubleshooting Procedures
IK0500038 Steering Shake, Shimmy, Shudder, or Steering Vibration
IK0400102 ProStar-Vibration While Braking

Go back!

GoodYear Tire training videos related to
wheel induced vibrations

Goodyear
Tire
Website

Michelin Tire Manual

Goodyear
tire manual

Road Force Balance Tire
Manual Click Here

• Understanding Vehicle Vibrations
◦ https://www.youtube.com/watch?
v=QmPgJ3eXK_w
• Controlling Vehicle Vibrations
◦ https://www.youtube.com/watch?
v=1PRgSy0hZ3A

Hunter Engineering MatchForce
HD tire balance machine video
https://www.youtube.com/watch?
v=xqxrX2k9QYw
Locate a MatchForce HD tire
machine near your dealer

• Minimize Vehicle Vibrations

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IK1700017 ­ LT vibration at highway speeds

◦ https://www.youtube.com/watch?
v=6ZWsuS4esQ8

http://www.hunter.com/heavyduty/forcematch-hd/search

Page 8 of 8

Hide Details

• Reduce tire runout using Match
Mounting

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◦ https://www.youtube.com/watch?
v=kuuYJPtzzC8
Copyright © 2018 Navistar, Inc.

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