Vehicle recall 91V080000 · May 23, 1991
1988-1989 Mack CF
Incorrect manufacture of the hydroboost cylinder allows the ball socket clamp to contact right side steering lever on an extreme left turn and cause flexing of the cylinder rod.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- Summary
- Incorrect manufacture of the hydroboost cylinder allows the ball socket clamp to contact right side steering lever on an extreme left turn and cause flexing of the cylinder rod.
- Consequence
- This flexing can cause seal failure or cylinder failureof the hydroboost unit and result in loss of steering control and result in avehicle accident.
- Remedy
- Replace incorrectly built boost cylinders.
- Notes
- System: steering power assist, hydroboost assembly.vehicle description: cf aerialscope model.
Recall details
- NHTSA campaign
- 91V080000
- Reported to NHTSA
- May 23, 1991
- Filed by
- MACK TRUCKS, INCORPORATED
- Owner notification
- May 2, 1991
- Vehicles potentially affected
- 35
- Initiated by
- NHTSA’s Office of Defects Investigation
- Components
- Steering › Hydraulic power assist system
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.