Hearth Record

Steering: linkages: knuckle: spindle: arm (Mack)

Vehicle recall 78V-171. NHTSA received MACK TRUCKS, INCORPORATED’s report on Aug 8, 1978.

NHTSA’s own record, on nhtsa.gov

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The short answer

NHTSA received MACK TRUCKS, INCORPORATED’s report on Aug 8, 1978. Copied from NHTSA on Oct 28, 2026.

Every line below is in NHTSA’s own words, with its source beside it.

What’s wrong with it?

The notice gives no hazard in a field of its own.

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.

Source:

NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.

  • NHTSA’s part: Steering: linkages: knuckle: spindle: arm.

What should you do?

DEALER WILL INSPECT AND, IF NECESSARY, REPLACE THE LEFT STEERING KNUCKLE WITH AN IMPROVED TYPE OF KNUCKLE.

Source:

NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.

  • How to reach the firm: VEHICLE DESCRIPTION: TRUCK TRACTORS.SYSTEM: STEERING; STEERING KNUCKLE.CONSEQUENCES OF DEFECT: LOSS OF STEERING CONTROL COULD CAUSE A VEHICLEACCIDENT.
  • Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.

Which ones are recalled?

NHTSA counts 2,100 vehicles potentially involved, across everything this recall names.

Source:

NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.

  • Mack Rand 1971, 1972, 1973 and 1974, before the model years listed here
  • Mack Fand 1971, 1972, 1973 and 1974, before the model years listed here
  • Mack MBand 1971, 1972, 1973 and 1974, before the model years listed here
  • Mack Uand 1971, 1972, 1973 and 1974, before the model years listed here

Who is recalling it?

  • Made by MACK TRUCKS, INCORPORATED.
Source:

NHTSA, Recalls flat file before 2010. Released Oct 28, 2026. Updated daily.

What the record doesn’t say

  • NHTSA’s recall file doesn’t say whether anyone was hurt.
  • Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
  • This recall names only model years before 2015, which have no pages here. Your VIN, at NHTSA, says which recalls are open on a vehicle.
  • How many have been returned or fixed isn’t in the notice.
Source:

Hearth Record wrote these lines.

Sources

Source:

Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 28, 2026.

How to read a record

Four things every record does, shown on an example record made up for this guide.

An example record, made up for this guide

An example nursing home

Made up for this guide: no real place is shown

Not fully inspected in over two years (CMS flag)

11 health citations at the latest inspection cycle

The state average is 14.3.

Source:

CMS, State and US Averages and Health Deficiencies. Released Oct 28, 2026. Updated monthly.

From the homeNone yet. Replies and paid listings aren’t open, and when they open they will sit here, below the record.

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Every fact names its source.

Who published it, when, and how often it changes sit beside each fact, with a link to the agency’s own file.

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