IK0500061 - CE Bus Steering Returnability Diagnostics

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Countries:

CANADA, UNITED STATES,
MEXICO

Document ID: IK0500061

Availability:

ISIS, Bus ISIS, FleetISIS, IsSIR

Revision:

2

Major System:

STEERING SYSTEM

Created:

5/23/2019

English

Last
Modified:

8/19/2019

Author:

David
Horner

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Other Languages: NONE
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Title : CE Bus Steering Returnability Diagnostics
Applies To : CE Bus w/ Tilt Columns, ESP, and Steering Switch Controls

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
09/05/2019 ­ Added repair instructions and part numbers, updated author for feedback
08/19/2019 - Added production build date break
05/30/2019 - Initial Article Release

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

DESCRIPTION
This document will guide the user through diagnosing steering wheels not returning to center without assistance on IC CE Buses.
This document only applies to CE buses built during 1/29/2018 thru 6/11/2019 with the following feature codes:
• Tilt Column: 0005708 (Column part number 4095815C91 (Bendix) or 4110141C91 (Wabco))
• ABS with ESP: 0004AZS (Bendix air system) or 0004JNX (Wabco hyd. system)
• Steering wheel Switch: 0047DNK or 0047DNU or 0047DWC

SYMPTOM(s)
Diagnostic Trouble Code(s) & Dashboard Indicator Light(s):
There are no fault codes associated with this failure mode.
Customer Observations or Concerns:
The customer may notice that the vehicle may have reduced return-ability without some assistance or the steering wheel may not
fully return to "on center position" after a turn without some assistance.
Note: Return-ability definition - The feel and predictability of the steering system's center return. Steering should return towards
"on center" smoothly and quickly without any binding.

SPECIAL TOOL(s) / SOFTWARE
Tool Description

Tool Number

Steering Wheel Puller 05-252-01

Comments

Instructions
TL2900050

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IK0500061 - CE Bus Steering Returnability Diagnostics

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SERVICE PARTS INFORMATION
Kit Description

Part Number

Quantity
Required

Notes

Modified Bare Steering Wheel Kit

6100132C91

1

5mm of material removed from the
hub. No cover, wiring or switche

DIAGNOSTIC STEP(s)

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

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.

The return-ability procedure should be performed on a flat paved surface where greater
than a full lock turn can be performed safely.
Possible Causes of low return-ability:
•
•
•
•
•
•
•

Low Steering Axle Caster
Binding Kingpins
Binding Draglink Ends
Binding Tie Rod Ends
Binding Steering Gear
Binding Steering Shaft U­joints/Slip Joint
Binding Steering Column

Step Action
DIAGNOSTIC:

Decision
Yes. No additional actions are needed

Determine the vehicles returnability of the steering.
This procedure should be performed on a flat paved surface where greater than
a full lock turn can be performed safely.

1

From a full stop, turn the wheel to full lock. Take hands off the steering wheel
and start to accelerate gradually, the vehicle should be making a circle. Increase
the vehicle speed to no more than 20mph without hands on the wheel. Repeat
the test for both left and right turns.
Does the steering return in both directions to within 180 degrees or 1/2 turn
of straight before the bus completes two full circles with smooth and
predictable steering movement?

No. Proceed to step 2.

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IK0500061 - CE Bus Steering Returnability Diagnostics

Step Action
DIAGNOSTIC:
Inspect for clockspring to steering wheel interference.

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Decision
Yes. Replace the steering wheel per the
repair solution below.

Remove the steering wheel and remove the clockspring.

2

Without reinstalling the clockspring, install the steering wheel, torque the steering
wheel nut to 55-60ft-lbs.
No. Reinstall the clockspring. Check
alignment, then diagnose
With the clockspring removed repeat the return-ability test in step 1.
potential binding in the steering gear,
kingpins, draglink/tie rod ends, or
Does the steering return in both directions to within 180 degrees or 1/2 turn
steering shaft.
of straight before the bus completes two full circles with smooth and
predictable steering movement?

Figure 1: Steering column cut-a-way view

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IK0500061 - CE Bus Steering Returnability Diagnostics

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Figure 2: Steering column and steering wheel with covers removed for visual

REPAIR STEP(s)

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.

Always wear safe eye protection when performing vehicle maintenance. Failure to do so
may result in 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.

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IK0500061 - CE Bus Steering Returnability Diagnostics

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Step 1. Remove original steering wheel, it is to be replaced with part number 6100132C91.
Step 2. Transfer over steering wheel cover, switches, wiring harness, and horn cover retention springs to the new wheel and
reinstall the clockspring that was previously removed.
Step 3. Install the new steering wheel and torque the to 55-60 fl-lbs.
Step 4. Validate repair by repeating returnability test in diagnostic step 1.

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
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Copyright © 2019 Navistar, Inc.

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