Recall 21V322 affects 47 2021 Oshkosh S-Series vehicles for auxiliary axles that can detach. Repair is free at any franchised Oshkosh dealer.
Oshkosh is recalling 47 2021 S-Series trucks under recall 21V322 because the auxiliary axles were not properly secured and can detach from the vehicle. A detached axle can cause loss of vehicle control and raise the risk of a crash, so Oshkosh dealers will inspect and secure the axles free of charge.
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What's wrong?
The auxiliary axle on these 2021 Oshkosh S-Series trucks is an extra axle added behind the standard drive axles to spread heavy loads across more wheels. It is bolted to the frame with Huck fasteners, a one-piece rivet-style fastener that gets swaged onto a collar to lock the joint tight. When installed correctly, the collar deforms in a specific pattern that holds the axle firmly to the truck under load.
On affected Oshkosh trucks, a third-party installer at one facility did not properly swage the Huck collars during axle installation. The fasteners look seated, but the collar was never fully locked down. Over miles of driving and load cycles, those loose fasteners can work free, and the auxiliary axle can shift or detach from the vehicle.
Drivers can watch for visual marks on the Huck collar that show whether the fastener was swaged correctly. Changes in how the truck handles or new driveline vibrations are also warning signs that the auxiliary axle has started to move.
Who's affected?
| 2021 Oshkosh S-Series | suspension component |
|---|---|
| Units affected | 47 |
| Field incidents | NHTSA has logged 1 field incident to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included in this recall.
What's the safety risk?
A detached axle can cause a loss of vehicle control and lead to a crash. Watch for changes in handling or driveline vibrations, and inspect the Huck collar fasteners for visual signs of improper installation. Treat any unusual movement of the auxiliary axle as a reason to stop driving and call the dealer. Repair is free at any franchised Oshkosh dealer.
What should I do?
- Check your VIN to confirm your 2021 Oshkosh S-Series is included in this recall.
- Contact a franchised Oshkosh dealer to schedule the auxiliary-axle fastener inspection that addresses the risk of an axle detaching.
- Call Oshkosh customer service at 1-888-686-7278 with questions and reference recall number 21V322 when you call.
- Bring the owner notification letter to the appointment if you have it; Oshkosh mailed letters on May 26, 2021.
- Drive cautiously until the repair is complete, and stop driving the vehicle if you notice unusual movement, noise, or handling from the rear axles.
What happens at the repair
At the dealer, an Oshkosh technician inspects the auxiliary axle fasteners and replaces any that were not properly installed. Parts and labor are free under the recall. Oshkosh has a general reimbursement plan on file, so if you already paid out of pocket to have improperly secured auxiliary axle fasteners corrected, bring your repair receipts and documentation to the service desk when you arrive. For questions about the program or to confirm your paperwork before the visit, contact Oshkosh customer services at 1-888-686-7278.
| Reimbursement | Reimbursement available |
|---|
Timeline
| May 6, 2021 | NHTSA published the recall |
|---|---|
| May 26, 2021 | Owner notification mailed |
| May 26, 2021 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 21V322?
Recall 21V322 covers 47 2021 Oshkosh S-Series vehicles with auxiliary axles that were not properly secured and can detach from the chassis. A detached axle can cause a loss of vehicle control and a crash. An Oshkosh technician will inspect the fasteners and replace any that were installed incorrectly, free of charge.
What should I do if my 2021 Oshkosh S-Series is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 21V322. If it is, contact Oshkosh customer service at 1-888-686-7278 to schedule the auxiliary axle fastener inspection. Reference recall number 21V322 when you call. The inspection and any needed fastener replacement are free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to fix the defect at no cost to the owner. An Oshkosh technician will inspect the auxiliary axle fasteners and replace any improperly installed fasteners free of charge, regardless of where the vehicle was originally purchased or how the work is scheduled.
What is the safety risk?
An auxiliary axle that was not properly secured can detach from the vehicle while it is in motion. A detached axle can cause a loss of vehicle control and increases the risk of a crash. Owners should schedule the free inspection promptly so a technician can verify the fasteners and correct any that are loose or missing.
When were owners notified about recall 21V322?
Oshkosh mailed owner notification letters on May 26, 2021. If you bought the vehicle used or never received a letter, check your VIN to confirm your specific S-Series is included in recall 21V322, then call Oshkosh customer service at 1-888-686-7278 to arrange the free fastener inspection.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V322000 |
|---|---|
| Oshkosh customer service | 1-888-686-7278 |
| NHTSA recall # | 21V322 |
| NHTSA recall # (full) | 21V322000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 24, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →