Vehicle recall 79V082000 · April 3, 1979
Mack DM, R and 2 more models
An improper pinch bolt and nut may have been used in the clamping of the steering shaft to the steering gear input shaft.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- An improper pinch bolt and nut may have been used in the clamping of the steering shaft to the steering gear input shaft. Due to clamping force loads applied at the bolt, the nut could yield, resulting in looseness of the input shaft yoke. Should this condition go unnoticed, spline wear could cause shaft separation.
- Remedy
- Vehicles will be inspected and, if necessary, the correct fasteners will be installed at no charge to owner.
- Notes
- Vehicle description: heavy trucks.system: steering; steering shaft clamp bolt.consequences of defect: this defect could cause loss of vehicle control and avehicle accident.
Recall details
- NHTSA campaign
- 79V082000
- Reported to NHTSA
- April 3, 1979
- Filed by
- MACK TRUCKS, INCORPORATED
- Owner notification
- August 13, 1979
- Vehicles potentially affected
- 12,000
- Initiated by
- the manufacturer
- Components
- Steering › Steering wheel/handle bar
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
Has your Mack been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. A Mack dealer can also check your VIN. Recall repairs are free.