CR4943 – Loss of Drive from Fractured Pressure Switch – 2016 Nova LFS & LFS Artic Buses

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August 5, 2020 NHTSA CAMPAIGN NUMBER: 20V457000

Loss of Drive from Fractured Pressure Switch

A loss of drive can disable the vehicle unexpectedly, increasing the risk of a crash. Additionally, offloading passengers to transfer them to another bus can increase the risk of injury.

 

NHTSA Campaign Number: 20V457

Manufacturer Nova Bus

Components POWER TRAIN

Potential Number of Units Affected 34

 

Summary

Nova Bus (Nova) is recalling certain 2016 LFS and LFS Artic buses equipped with specific Allison Transmission drive units. The pressure switches on these Drive Units may fail, possibly resulting in a loss of drive.

 

Remedy

Nova will notify owners, and Allison Transmissions will replace the C1 and C2 pressure switches, free of charge. The recall began September 15, 2020. Owners may contact Nova customer service at 1-800-350-6682. Nova’s number for this recall is CR4943.

 

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.safercar.gov.

 


SUBJECT:

Allison electric drive Ep -40/50

 

JUSTIFICATION:

Allison Transmission Inc. informed Nova Bus that some pressure switches used in the switch assembly may fracture. This condition may result in a loss of propulsion with no possibility of regaining it.

 

PROCEDURE

Contact your nearest Allison Transmission Inc. certified service center to have the requirement of this recall campaign done to your vehicles.

 

NHTSA Recall No. 20E049

 

Procedure for Inspection and Removal of Debris:

 

1. With the Drive Unit installed, drain the fluid into a clean container for reuse, and drop the oil pan from the Drive Unit.

 

2. Remove the suction filter and unplug all connectors on the internal harness.

 

3. Remove the oil level sensor, C1/C2 valve body, shift relay valve body, control main valve body, and separator plate.

 

4. Remove the C1 and C2 plugs (shown below) on the backside of the rear cover.

 

5. Starting with the C2 pressure circuit, plug the 4mm orifice on the stator housing, as shown below. Pressurize the C2 pressure tap on the rear cover with air to blow out any debris. Check the previously plugged 4mm passage for loose debris and remove if any is found.

 

6. To inspect the C1 pressure circuit, plug the 4mm orifice on the opposite side the stator housing, as shown below. Pressurize the C1 pressure tap on the rear cover with air to blow out any debris. Check the previously plugged 4mm passage for loose debris and remove if any is found.

 

7. Inspect the removed valve bodies and the separator plate for any machine chips or debris. Verify proper valve movement. If any debris is found, additional valve body teardown should be performed. Replace any components that may have damage.

 

8. Reassemble the valve bodies and install two (2) new pressure switches (P/N 29506484) and O-rings (P/N 29501439). New switches must be stamped with date code 1918 or later on the metal retainer ring.

 

9. Reassemble remaining parts, refill the Drive Unit, and test drive to verify proper operation.

 



2 Affected Products

Vehicles

MAKE MODEL YEAR
NOVA BUS LFS 2016
NOVA BUS LFS ARTIC 2016

 


9 Associated Documents

Defect Notice 573 Report

RCLRPT-20V457-1669.PDF 214.795KB

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Recall Acknowledgement

RCAK-20V457-6313.pdf 244.807KB

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Owner Notification Letter(Part 577)

RCONL-20V457-5137.pdf 263.562KB

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Remedy Instructions and TSB

RCRIT-20V457-5916.pdf 1685.914KB

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Recall Quarterly Report #2, 2020-4

RCLQRT-20V457-0094.PDF 211.229KB

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Recall Quarterly Report #3, 2021-1

RCLQRT-20V457-5263.PDF 211.311KB

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Recall Quarterly Report #1, 2020-3

RCLQRT-20V457-7782.PDF 211.124KB

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Recall Quarterly Report #4, 2021-2

RCLQRT-20V457-8309.PDF 211.415KB

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Recall Quarterly Report #5, 2021-3

RCLQRT-20V457-1088.PDF 211.534KB

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Latest Recalls Documents

For the Latest and Most Recent Recalls Information Visit the link below…

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=20V457&docType=RCL

 


 

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Last update on 2024-03-13 / Affiliate links / Images from Amazon Product Advertising API

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