22527 Loose Fasteners May Cause Rear Axle Instability – 2023 IC Bus RE, IC Bus EV, & 2023-2024 IC Bus CE School Buses

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December 8, 2022 NHTSA CAMPAIGN NUMBER: 22V909000

Loose Fasteners May Cause Rear Axle Instability

A rear axle that moves side to side can cause a loss of handling and control, increasing the risk of a crash. In addition, a loose rear axle may cause vehicle instability during an evacuation in an emergency, increasing the risk of injury.

 

NHTSA Campaign Number: 22V909

Manufacturer Navistar, Inc.

Components SUSPENSION

Potential Number of Units Affected 6,948

 

Summary

Navistar, Inc. (Navistar) is recalling certain 2023 IC RE, IC EV, and 2023-2024 IC CE school buses. The fasteners that connect the transverse torque arm to the rear axle housing may have been tightened incorrectly, which can allow the rear axle to shift side to side.

 

Remedy

Dealers will replace and tighten the fasteners, free of charge. Owner notification letters are expected to be mailed February 6, 2023. Owners may contact Navistar’s customer service at 1-800-448-7825. Navistar’s number for this recall is 22527.

 

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.

 


22527
FEBRUARY, 2023

SAFETY RECALL
Transverse Torque Rod Fasteners on certain 2022 and 2023 IC Bus® CE school bus models and 2022 IC Bus® RE and Electric CE school bus models built 02/01/2022 thru 11/15/2022 with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS)

 

DEFECT DESCRIPTION

The fasteners of the transverse torque arm to the rear axle housing may not have been tightened to their specified value at time of assembly. Over time, they may become loose or separate, resulting in the rear axle shifting from side to side. In a bus application, a rear axle that shifts from side to side can cause reduced handling performance and may result in an increased risk of injury if students must be transferred to another bus near the roadway.

 

MODELS INVOLVED

This safety recall involves certain 2022 and 2023 IC Bus® CE school bus models and 2022 IC Bus€> RE and Electric CE school bus models built 02/01/2022 thru 11/15/2022 with feature code 14TBH, 14TBS, or 14TBT (Suspension, rear, air single; International IROS).

 

PARTS INFORMATION

Part Number Part Description Quantity
8900326R91 Kit; IROS Fasteners 1

 

SERVICE PROCEDURE

1. Park vehicle on flat surface.

2. Shift transmission to Park or Neutral and set parking brake.

3. Turn vehicle to Key OFF position.

4. Install wheel chocks.

 

5. Remove bolts (Figure 1, Item 1) and nuts (Figure 1, Item 2) that fasten transverse torque rod to axle. Discard bolts and nuts.

6. Install new bolts (Figure 1, Item 1) and nuts (Figure 1, Item 2) that secure transverse torque rod to axle.

7. Tighten nuts to 217-239 lb-ft (294-325 N•m).

8. Remove wheel chocks.

 

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Chronology :

  • 08/05/2022 – Navistar Field Service reviews field reports of four units with loose transverse torque rod axle side bolts on units in service less than three months.
  • 08/10/2022 – Navistar’s Tulsa bus plant inspected 10 units built in
    March and all were found in specification. Additionally, the tool and process for the transverse torque rod to axle joint were inspected with no issues found.
  • 08/11/2022 through 09/22/2022 – Nine more units were found with loose of missing axle side fasteners.
  • 09/22/2022 – Navistar Field Service received communication of three more units with axle side fasteners missing on units in service for less than three months.
  • 09/26/2022 – IC Bus dealer inspected 90 units at one location. All but 5 had their fasteners retightened to their specified value.
  • 10/31/2022 – IC Bus dealer reinspected 10 of the fleet; four units found with bolts loose a second time.
    These fasteners were replaced and sent to Navistar engineering for analysis.
  • 11/11/2022 – Navistar completes the part analysis for material hardness and found no deficiencies.
  • 11/16/2022 – Navistar contains the issue in manufacturing by instituting a secondary torque top-off operation.
  • 11/22/2022 – Navistar finalizes the suspect population.
  • 12/01/2022 – Navistar declares a Safety Recall.

 


4 Affected Products

Vehicles

MAKE MODEL YEAR
IC BUS CE 2023-2024
IC BUS EV 2023
IC BUS RE 2023

 


5 Associated Documents

Recall Acknowledgement

RCAK-22V909-6903.pdf 646.215KB

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Defect Notice 573 Report

RCLRPT-22V909-5535.PDF 215.825KB

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Recall 573 Report – December 13, 2022

RCLRPT-22V909-3880.PDF 215.868KB

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Remedy Instructions and TSB

RCRIT-22V909-1126.pdf 174.177KB

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ISSUED Owner Notification Letter(Part 577)

RCONL-22V909-2556.pdf 44.919KB

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Latest Recalls Documents

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=22V909&docType=RCL

 


 

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