Recall 78V-171: 1971–1974 Mack F, 1971–1974 Mack MB and 2 more
MACK TRUCKS, INCORPORATED recall for steering, reported to NHTSA on Aug 8, 1978, covering about 2,100 vehicles.
The problem
Deficiencies, in the form of forging laps, cracks and excessive decarburization during heat treatment, exist in the steering knuckles. Stresses imposed with integral hydraulic power steering may lead to a failure in the area of the steering arm attaching boss. This type of failure would cause loss of steering control.
The fix
Dealer will inspect and, if necessary, replace the left steering knuckle with an improved type of knuckle.
Notes
Vehicle description: truck tractors.system: steering; steering knuckle.consequences of defect: loss of steering control could cause a vehicleaccident.
Recall details
| Manufacturer | MACK TRUCKS, INCORPORATED |
|---|---|
| Component | Steering › Linkages › Knuckle › Spindle › Arm |
| Recall started by | the manufacturer |
| NHTSA campaign number | 78V171000 |
Vehicles in this recall
| Vehicle | Model years | |
|---|---|---|
| Mack F | 1971, 1972, 1973, 1974 | All years |
| Mack MB | 1971, 1972, 1973, 1974 | All years |
| Mack R | 1971, 1972, 1973, 1974 | All years |
| Mack U | 1971, 1972, 1973, 1974 | All years |
Not every vehicle of these model years is included. Enter your VIN at nhtsa.gov/recalls ↗ or ask a dealer.
Frequently asked questions
What is recall 78V-171?
Deficiencies, in the form of forging laps, cracks and excessive decarburization during heat treatment, exist in the steering knuckles. Stresses imposed with integral hydraulic power steering may lead to a failure in the area of the steering arm attaching boss. This type of failure would cause loss of steering control.
How is recall 78V-171 fixed?
Dealer will inspect and, if necessary, replace the left steering knuckle with an improved type of knuckle.
Is the recall repair free?
Yes. Safety recall repairs are free at authorized dealers. Check whether your vehicle is included with its VIN at nhtsa.gov/recalls.