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1977 Mack R recalls

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

10 recalls found in NHTSA data as of September 22, 2026

For the 1977 Mack R. These apply to the model and year, not to one particular vehicle: check your VIN to see whether yours is included and whether it has been repaired.

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.

1977 Mack R recalls, newest first

May 31, 1979NHTSA 79V13300023,000 vehicles potentially affected

Engine and engine cooling › Engine

Summary
In the event of turbocharger compressor wheel failure, one or more of the four capscrews that hold the turbocharger together may be struck by parts of the compressor wheel, resulting in the capscrews being damaged. If these capscrews are damaged to the point that they allow the compressor back plate to dislocate from the turbocharger bearing housing, engine lubricating oil may be allowed to escape under pressure, contacting the engine exhaust manifold sections or turbocharger turbine housing.
Remedy
Dealer will install a shield for the heads of the four capscrews, along with stronger sae 8 grade 8 capscrews, if necessary, at no cost to owner.

This recall on nhtsa.gov

April 3, 1979NHTSA 79V08200012,000 vehicles potentially affected

Steering › Steering wheel/handle bar

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.

This recall on nhtsa.gov

January 12, 1979NHTSA 79V0170004,000 vehicles potentially affected

Suspension › Multiple axle

Summary
A casting deficiency exists in the lower section of the caps resulting in a reduction in the thickness of the material. Failure of a cap can allow the end of the rear spring to detach from the axle housing.
Remedy
Dealer will inspect and, if necessary, replace any of the spring insulator caps found to be defective. This will be done at no cost to owner.

This recall on nhtsa.gov

October 3, 1978NHTSA 78V21000019,370 vehicles potentially affected

Service brakes, air › Antilock › Interconnecting assembly(wiring)

Summary
Delays of up to about 2 seconds may exist in the brake application times to the brakes on the bogie axles in the presence of certain types of wheel speed sensor signal discontinuities or distortions that may occur as a result of sensor wire failure. This constitutes a non-compliance to federal motor vehicle safety standard no. 121, "air brake systems".
Remedy
Dealer will install new wheel speed sensors that incorporate improved wiring and the present bogie anti-wheel lock system will be changed to an axle-to-axle system for improved reliability.

This recall on nhtsa.gov

February 9, 1978NHTSA 78V03100033,000 vehicles potentially affected

Suspension › Multiple axle

Summary
The tee bracket, which is mounted on the front axle of the bogie, may fail due to vibration brought on by road surface irregularities. Bracket failure would leave the tee bracket unsupported and cause broken hose connector fittings. This would result in automatic application of the spring emergency brakes.
Remedy
The dealer will replace the defective bracket with a redesigned version.

This recall on nhtsa.gov

November 21, 1977NHTSA 77V2050007,400 vehicles potentially affected

Suspension › Rear › Springs › Leaf spring assembly › Hanger/bracket

Summary
A deficiency exists in the welds securing the rear spring insulator bracket to the axle housing. This is due to improper positioning of the weld, in relationship to the bracket and axle housing. Failure of the welds would cause separation of the spring insulator bracket and the axle housing, resulting in improper alignment of the affected axle.
Remedy
Dealer will reweld the insulator spring bracket at no cost to owner.

This recall on nhtsa.gov

October 12, 1977NHTSA 77V1740006,591 vehicles potentially affected

Seat belts › Front › Anchorage

Summary
The involved vehicles do not conform to federal motor vehicle safety standard no. 209, "seatbelt assemblies". Although the seatbelts in question performed marginally with respect to the 5000 lb. Load requirement, additional testing confirmed that the anchor could fail, allowing either the anchor to slip over the hold-down nut or the anchor to separate into two pieces.
Remedy
Dealer will inspect and, if necessary, replace seat belt assemblies without charge to owner.

This recall on nhtsa.gov

October 12, 1977NHTSA 77V17300048,000 vehicles potentially affected

Engine and engine cooling › Cooling system › Fan

Summary
The flex blade fans on the involved vehicles may develop cracks in the laminated stiffener as a result of fatigue during operation. If such a condition exists and the cracks go undetected, continued operation could cause pieces of the stiffener to break off.
Remedy
Dealer will replace the original fan with a steel fixed blade fan, free of charge.

This recall on nhtsa.gov

June 17, 1977NHTSA 77V096000825 vehicles potentially affected

Wheels

Summary
The front wheel rim clamp studs, installed on the involved vehicles, may not have been manufactured correctly, causing a brittle condition in the thread root area. The studs could eventually crack and break when wheel nuts are tightened to specifications.
Remedy
The dealer will replace all suspect front wheel studs, without charge to owner.

This recall on nhtsa.gov

Owner complaints

No owner complaints about the 1977 Mack R were found in NHTSA’s complaint data.

Other Mack R years

Other 1977 Mack models

Questions

Does the 1977 Mack R have any recalls?
10 recalls found in NHTSA data as of September 22, 2026, covering: engine and engine cooling, steering, suspension, service brakes, air, seat belts, wheels. Recalls apply to the model and year; whether a particular vehicle is included, and whether it has been repaired, depends on its VIN.
How do I check if my 1977 Mack R recall has been fixed?
Enter your 17-character VIN at nhtsa.gov/recalls, or ask a Mack dealer. Recall repairs are free. NHTSA's VIN search doesn't list recalls that were already repaired.
How many complaints have owners filed about the 1977 Mack R?
0 complaints filed with NHTSA. Complaints are unverified reports from the public that NHTSA uses to decide what to investigate.