Recall Register

1977 Mack RWL: recalls and complaints

NHTSA lists 4 recall campaigns for the 1977 Mack RWL. The newest campaign is 79V137000. NHTSA received the report on 1 Jun 1979. The NHTSA record gives the component Steering / Linkages. 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, 79V137000, in the NHTSA record

Dealer will inspect and retorque pitman arm, if necessary, at no cost to owner.
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

4 campaigns, newest first. 27,054 units in total.

  • 79V137000Steering / Linkages
  • 78V222000Electrical System / Wiring
  • 78V210000Service Brakes, Air / Antilock / Interconnecting Assembly(Wiring)
  • 78V170000Engine and Engine Cooling / Engine

  1. 79V137000Received . 6,673 units.

    Steering / Linkages

    Defect, in the NHTSA record
    The pitman arm retaining nut may not have been torqued to manufacturer specifications. This could result in inadequate retention of the nut at the output shaft, allowing the pitman arm to become loose.
    Remedy, in the NHTSA record
    Dealer will inspect and retorque pitman arm, if necessary, at no cost to owner.

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

  2. 78V222000Received . 161 units.

    Electrical System / Wiring

    Defect, in the NHTSA record
    A short circuit could occur due to chafing or wire disconnection in the box.
    Remedy, in the NHTSA record
    The wiring in the sleeper box will be corrected, free of charge.

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

  3. 78V210000Received . 19,370 units.

    Service Brakes, Air / Antilock / Interconnecting Assembly(Wiring)

    Defect, in the NHTSA record
    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, in the NHTSA record
    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.

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

  4. 78V170000Received . 850 units.

    Engine and Engine Cooling / Engine

    Defect, in the NHTSA record
    The possibility exists that the aluminum engine rear support brackets may fail due to metal fatigue. This type of failure would allow the engine and transmission assembly to dislocate downward. This will result in throttle control loss with the engine operating continuously in the mid to upper range of the governed speed range.
    Remedy, in the NHTSA record
    Dealer will inspect and, if necessary, replace aluminum support brackets with brackets made from ductile iron for increased strength.

    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. 19751
  2. 19761
  3. 19774
  4. 19787
  5. 19796
  6. 19801
  7. 19811

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. 1977 Mack RWL: recalls and complaints. https://recallregister.com/vehicle/mack/rwl/1977/. 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
30 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 1977 Mack RWL?
27,054 units in 4 campaigns. A campaign can name other models and model years, and its units include them.
How many recall campaigns does the Mack RWL have for all model years?
NHTSA lists 10 recall campaigns for the Mack RWL, model years 1975 to 1981. 4 of them name the 1977 model year.
Is an NHTSA investigation of the 1977 Mack RWL open?
The NHTSA investigation file has no investigation that names this model year.