Recall 15V412 affects 24 2015 Oshkosh S-Series concrete mixer trucks for loose torque converter bolts. Repair is free through Oshkosh and Valley Truck Parts.
Oshkosh is recalling 24 2015 S-Series front-discharge concrete mixer glider trucks because excess paint on an Allison transmission mounting surface can soften during operation and loosen torque converter mounting bolts. Loose bolts can shear at the torque converter bolt flange, causing sudden loss of drive power and higher crash risk; the Oshkosh dealer repair will be free once available.
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What's wrong?
The Allison HD4500 transmission in the 2015 Oshkosh S-Series glider truck uses a torque converter to transfer engine power into the automatic transmission. The torque converter bolts to an adaptation kit, a mounting interface that lets the converter and transmission connect squarely and hold alignment under load. Those bolts have to stay tight as the mixer truck starts, stops, and works under heavy driveline force.
On these trucks, the transmission was remanufactured with a thick paint layer on the torque converter to adaptation kit mounting surface. During vehicle operation, that paint can soften. Once the paint softens, the clamping force at the mounting surface drops, and the mounting bolts can loosen instead of holding the torque converter firmly in place.
There is no warning sign before failure. That means an affected truck should be handled through the recall repair path, not watched for a dashboard light or a specific symptom.
Who's affected?
| 2015 Oshkosh S-Series | automatic transmission |
|---|---|
| Units affected | 24 |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Loose torque converter mounting bolts can let the flange bolts shear, causing sudden loss of drive power and increasing crash risk. If the truck loses drive power, move out of traffic when it is safe and call for service. Repair will be free at any franchised Oshkosh dealer once available.
What should I do?
- Check your VIN to confirm your 2015 Oshkosh S-Series is included in this recall.
- Contact Oshkosh customer service at 1-888-686-7278 to confirm the repair path before scheduling service.
- Ask about the free torque-converter bolt service that removes paint from the mounting surface and replaces the bolts.
- Bring the recall notice if Oshkosh sent one. Reference recall number 15V412 when you call.
- Drive cautiously until the repair is complete. Loss of drive power increases crash risk if the torque-converter bolts loosen.
What happens at the repair
The dealer repair will be free once available. At the service visit, an Oshkosh technician removes paint from the torque converter mating surface and replaces the mounting bolts. That work addresses the paint layer that can soften during vehicle operation and let the bolts loosen. Oshkosh notified owners, and the recall began on May 8, 2015. Owners can contact Oshkosh customer service at 1-888-686-7278 for repair routing tied to this campaign.
Timeline
| May 8, 2015 | Owner notification mailed |
|---|---|
| June 30, 2015 | NHTSA published the recall |
Frequently asked questions
What is recall 15V412?
Recall 15V412 covers 24 2015 Oshkosh S-Series Front Discharge concrete mixer glider trucks with Allison HD4500 transmissions. Paint on the torque converter mounting surface can soften during operation, letting the mounting bolts loosen. Valley Truck Parts will remove the paint and replace the bolts for free.
What should I do if my 2015 Oshkosh S-Series is on this recall?
Check your VIN to confirm your specific truck is included in recall 15V412. If it is, contact Oshkosh customer service at 1-888-686-7278 and ask how to complete the free torque converter repair through Valley Truck Parts.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to correct the defect at no cost, and Oshkosh's recall remedy says Valley Truck Parts will remove the paint from the torque converter mating surface and replace the bolts free of charge.
What is the safety risk in recall 15V412?
The risk is sudden loss of drive power. If the torque converter mounting bolts loosen, the bolts on the torque converter bolt flange can shear, which increases crash risk. Confirm the VIN, then arrange the free bolt replacement and paint removal before putting the truck back into regular service.
What if I bought the Oshkosh S-Series used?
The free recall repair still applies. Recall coverage follows the VIN, not the first owner. Check your VIN to confirm whether this 2015 Oshkosh S-Series is included, then reference recall 15V412 when you contact Oshkosh or the repair provider.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/15V412000 |
|---|---|
| Oshkosh customer service | 1-888-686-7278 |
| NHTSA recall # | 15V412 |
| NHTSA recall # (full) | 15V412000 |
Source documents
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 1, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →