IK0500061 - CE Bus Steering Won't Return to Center

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Countries: CANADA, UNITED STATES, MEXICO
Document ID: IK0500061
Availability: ISIS, Bus ISIS, FleetISIS, IsSIR Revision: 0
Major System: STEERING SYSTEM Created: 5/23/2019
Current
Language: English Last
Modified: 6/5/2019
Other Languages: NONE Author: William
Knoth
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Title: CE Bus Steering Won't Return to Center
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:
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05/30/2019 - Initial Article Release
DESCRIPTION
This document will guide the user through diagnosing steering wheels not returning on IC CE Buses. This document only applies to CE buses with the following feature codes: ï Tilt Column: 0005708 (Column part number 4095815C91 (Bendix) or 4110141C91 (Wabco)) ï ABS with ESP: 0004AZS (Bendix air system) or 0004JNX (Wabco hyd. system) ï 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 will notice that the vehicle will have poor return-ability, or the steering wheel may not return to "on center" after a
turn, or may only return slightly. 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 Comments Instructions
Steering Wheel Puller 05-252-01 TL2900050
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SERVICE PARTS INFORMATION
Kit Description Part Number Quantity
Required Notes
Currently there are no parts for this repair
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: ï Low Steering Axle Caster ï Binding Kingpins
ï Binding Draglink Ends
ï Binding Tie Rod Ends
ï Binding Steering Gear ï Binding Steering Shaft U­joints/Slip Joint ï Binding Steering Column
Step Action Decision
1
DIAGNOSTIC:
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. 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?
Yes. No additional actions are needed
No. Proceed to step 2.
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Step Action Decision
2
DIAGNOSTIC:
Inspect for clockspring to steering wheel interference. Remove the steering wheel and remove the clockspring. Without reinstalling the clockspring, install the steering wheel, torque the steering
wheel nut to 55-60ft-lbs. With the clockspring removed repeat the return-ability test in step 1. 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?
Yes. Open a case file for repair
instruction
No. Reinstall the clockspring. Check
alignment, then diagnose
potential binding in the steering gear, kingpins, draglink/tie rod ends, or
steering shaft.
Figure 1: Steering column cut-a-way view
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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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Step 1. Create a case file with Navistar Tech Support for further instructions. 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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