Recall 21V904 covers 80 2021 E-One Cyclone Ii, Cyclone N, Typhoon, and Typhoon N vehicles for a drive pinion that can fracture. Repair is free.
E-One is recalling 80 2021 Cyclone Ii, Cyclone N, Typhoon, and Typhoon N vehicles because the rear axle drive pinion can fracture. If the broken pinion contacts the brake drop hose, the parking brake can engage unintentionally and raise the risk of a crash; E-One dealers will complete the recall repair free of charge.
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What's wrong?
The rear axle carrier on these 2021 E-One Cyclone Ii, Cyclone N, Typhoon, and Typhoon N vehicles holds the gear set that sends engine power through the rear axle. Inside that carrier, the pinion shaft is the small drive gear that turns the larger ring gear. Its job is to transfer torque cleanly while the axle is under load.
On affected vehicles, the Meritor drive pinion was built with a tooling geometry variation in the pinion spline area. The spline is the cut section that locks the shaft to the parts around it. When that area is not shaped as intended, the pinion shaft can crack and fracture under a high load event. A broken pinion stops that gear set from doing its job and can damage nearby parts in the axle area.
There is no warning sign before failure. The filing describes the issue as occurring without warning, so an owner should not rely on noise, vibration, or a dashboard light to identify it.
Who's affected?
Covers the Cyclone Ii, Typhoon N, Cyclone N, and Typhoon trucks, all tied to the same drive axle.
| 2021 E-One Cyclone Ii | drive axle |
|---|---|
| 2021 E-One Typhoon N | drive axle |
| 2021 E-One Cyclone N | drive axle |
| 2021 E-One Typhoon | drive axle |
| Units affected | 80 |
| Field incidents | NHTSA has logged 3 field incidents to date. |
A matching model year and model does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
A fractured drive pinion can contact the brake drop hose and unintentionally engage the parking brake, increasing the risk of a crash. There is no warning sign before the issue happens, so schedule the repair soon and avoid extra trips until it is complete. Repair is free at any franchised E-One dealer.
What should I do?
- Check your VIN to confirm your 2021 E-One Cyclone Ii, Typhoon N, Cyclone N, or Typhoon is included in this recall.
- Contact your nearest franchised E-One dealer to schedule the free rear-axle drive-pinion inspection and replacement that fixes the fracture risk.
- Bring the recall notice if E-One mailed one. If not, reference recall number 21V904 when you call.
- Limit use until the inspection or replacement is complete; a fractured drive pinion can engage the parking brake.
What happens at the repair
At the dealer, an E-One technician inspects the rear axle drive pinion and replaces the drive pinion if the inspection shows damage or fracture risk. Parts and labor are covered under the recall, so the dealer repair is free now. If you already paid out of pocket for a related drive pinion repair before the recall notice, E-One's general reimbursement plan covers documented eligible expenses. Keep your repair paperwork and contact E-One customer service to file the claim.
| Reimbursement | Reimbursement available |
|---|
Timeline
| November 19, 2021 | NHTSA published the recall |
|---|---|
| January 5, 2022 | Owner notification mailed |
| April 18, 2022 | Dealer notification began |
| April 25, 2022 | Dealer notification ended |
| April 26, 2022 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 21V904?
Recall 21V904 covers 80 2021 E-One Cyclone Ii, Typhoon N, Cyclone N, and Typhoon vehicles with a rear axle drive pinion that can fracture. If the fractured pinion contacts the brake drop hose, the parking brake can engage unintentionally and raise crash risk.
What should I do if my 2021 E-One Cyclone Ii, Typhoon N, Cyclone N, or Typhoon is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 21V904. If it is, contact E-One customer service at 1-352-237-1122 and ask how to arrange the drive pinion inspection and replacement. Reference recall 21V904 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost. For this recall, Meritor will inspect the rear axle drive pinion and replace it as needed free of charge.
What is the safety risk?
The safety risk is unintended parking-brake engagement while the vehicle is in use. The rear axle drive pinion can fracture, contact the brake drop hose, and engage the parking brake without the driver intending it. That raises the risk of a crash.
When were owners notified about recall 21V904?
Owner notification letters were mailed on January 05, 2022. Since that date has passed, affected owners who never received a letter should check the VIN and contact E-One customer service at 1-352-237-1122 with recall 21V904.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V904000 |
|---|---|
| E-One customer service | 1-352-237-1122 |
| NHTSA recall # | 21V904 |
| NHTSA recall # (full) | 21V904000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Report (PDF)
- Download Misc. Document (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →