Recall Register

1973 Mack U: recalls and complaints

NHTSA lists 5 recall campaigns for the 1973 Mack U. The newest campaign is 78V171000. NHTSA received the report on 8 Aug 1978. The NHTSA record gives the component Steering / Linkages / Knuckle / Spindle / Arm. NHTSA has no complaint on file for this model year.

The NHTSA recall file shows no do-not-drive advisory and no park-outside advisory on these campaigns.

This page cannot show if a recall applies to one vehicle. The NHTSA VIN lookup shows the unrepaired recalls of one vehicle.

Remedy of the newest campaign, 78V171000, in the NHTSA record

Dealer will inspect and, if necessary, replace the left steering knuckle with an improved type of knuckle.
NHTSA VIN lookup

Complaint information entered into NHTSA’s Office of Defects Investigation vehicle owner's complaint database is used with other data sources to identify safety issues that warrant investigation and to determine if a safety-related defect trend exists.

NHTSA publishes these words. Source: NHTSA Datasets and APIs, section Complaints, read on . Complaint file through . Recall file through .

Since the last update

No tracked figure of this page changed in a data update. What the log tracks

All updates to the register

Recall campaigns

5 campaigns, newest first. 52,656 units in total.

  • 78V171000Steering / Linkages / Knuckle / Spindle / Arm
  • 77V173000Engine and Engine Cooling / Cooling System / Fan
  • 75V118000Suspension / Multiple Axle
  • 74V001000Suspension
  • 74V227000Exterior Lighting / Headlights / Switch

  1. 78V171000Received . 2,100 units.

    Steering / Linkages / Knuckle / Spindle / Arm

    Defect, in the NHTSA record
    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.
    Remedy, in the NHTSA record
    Dealer will inspect and, if necessary, replace the left steering knuckle with an improved type of knuckle.

    Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: .

  2. 77V173000Received . 48,000 units.

    Engine and Engine Cooling / Cooling System / Fan

    Defect, in the NHTSA record
    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, in the NHTSA record
    Dealer will replace the original fan with a steel fixed blade fan, free of charge.

    Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: .

  3. 75V118000Received . 414 units.

    Suspension / Multiple Axle

    Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: .

  4. 74V001000Received . 1,119 units.

    Suspension

    Report filed by MACK TRUCKS, INCORPORATED.

  5. 74V227000Received . 1,023 units.

    Exterior Lighting / Headlights / Switch

    Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: .

The campaign number opens the NHTSA record. Each quotation is the text of the NHTSA recall file.

Recall campaign: One recall in the NHTSA recall file, with one campaign number. A campaign can name many makes, models and model years.

Units: The number of vehicles or products that a recall can include. The manufacturer or the firm reports the number to the agency.

Complaints by component

The NHTSA complaint file has no complaint for this model year.

Investigations

The NHTSA investigation file has no investigation that names this model year.

Investigation: A study of a possible safety defect by the NHTSA Office of Defects Investigation. An investigation with no closing date in the NHTSA file is open.

Other model years

The number under each year is the number of recall campaigns.

  1. 19671
  2. 19681
  3. 19692
  4. 19703
  5. 19715
  6. 19724
  7. 19735
  8. 19746
  9. 19756
  10. 19763
  11. 19778
  12. 19785
  13. 19791
  14. 19871
  15. 19881
  16. 19892
  17. 19901
  18. 19911
  19. 19921

A year without a link has fewer than 2 campaigns and fewer than 25 complaints. It has no page.

Official channels

Cite this page

Recall Register. 1973 Mack U: recalls and complaints. https://recallregister.com/vehicle/mack/u/1973/. Source: NHTSA Office of Defects Investigation, recall, complaint and investigation files. Data through .

Sources

Source
NHTSA Office of Defects Investigation
Licence
US government work, public domain
Recall file through
29 Sep 2026
Complaint file through
29 Mar 2018
First complaint in the file
1 Jan 1995
Manufacturer in the recall file
MACK TRUCKS, INCORPORATED

The NHTSA record is the authority. A complaint count is the number of different complaint numbers for the make, the model and the model year. How the register is made. Report an error.

Questions

How many units are in the recall campaigns for the 1973 Mack U?
52,656 units in 5 campaigns. A campaign can name other models and model years, and its units include them.
How many recall campaigns does the Mack U have for all model years?
NHTSA lists 22 recall campaigns for the Mack U, model years 1967 to 1992. 5 of them name the 1973 model year.
Is an NHTSA investigation of the 1973 Mack U open?
The NHTSA investigation file has no investigation that names this model year.