1975 Mack WL: recalls and complaints

NHTSA lists 13 recall campaigns for the 1975 Mack WL. The newest campaign is 78V170000. NHTSA received the report on 8 Aug 1978. The NHTSA record gives the component Engine and Engine Cooling / Engine. 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, 78V170000, in the NHTSA record

Dealer will inspect and, if necessary, replace aluminum support brackets with brackets made from ductile iron for increased strength.

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 1 Oct 2026. Complaint file through 15 May 2019. Recall file through 29 Sep 2026.

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

13 campaigns, newest first. 65,579 units in total.

78V1700008 Aug 1978Engine and Engine Cooling / Engine
78V0680004 Apr 1978Service Brakes, Air / Antilock / Control Unit/Module
78V0300009 Feb 1978Service Brakes, Air / Supply / Hoses, Lines/Piping, and Fittings
77V17300012 Oct 1977Engine and Engine Cooling / Cooling System / Fan
77V0130001 Jan 1977Service Brakes, Air / Drum
77V0110001 Jan 1977Steering / Gear Box (Other Than Rack and Pinion)
76V0830009 Jun 1976Service Brakes, Air / Drum / Chamber
76V06000020 Apr 1976Steering / Steering Wheel/Handle Bar
76V00500013 Jan 1976Visibility / Windshield Wiper/Washer / Motor
76V00600013 Jan 1976Service Brakes, Air / Antilock / Wheel Speed Sensor
75V13900024 Jul 1975Service Brakes, Air / Supply / Hoses, Lines/Piping, and Fittings
75V14000024 Jul 1975Steering / Steering Wheel/Handle Bar
75V14100024 Jul 1975Service Brakes, Air / Supply / Check Valve

78V170000Received 8 Aug 1978. 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: 4 Dec 1978.
78V068000Received 4 Apr 1978. 9,700 units.
Service Brakes, Air / Antilock / Control Unit/Module
Defect, in the NHTSA record
An axle "no brake" condition could result from an eaton controller internal electrical malfunction. This condition may cause the anti-wheel lock valve solenoid to be continuously energized and prevent the brakes from being applied on one of the axles. As a result, the anti-wheel lock warning lamp is not activated.
Remedy, in the NHTSA record
The dealer will inspect and, if necessary, replace the anti-wheel lock controller without charge to owner.
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 1 Sep 1978.
78V030000Received 9 Feb 1978. 400 units.
Service Brakes, Air / Supply / Hoses, Lines/Piping, and Fittings
Defect, in the NHTSA record
A design deficiency exists in the air dryer piping in the area of the pressure relief valve and compressor governor control link. Moisture is passed and builds up in this relief valve and control line. In freezing ambient temperatures, this moisture may freeze, allowing the chassis air system pressure to exceed 150 PSI. Excessive air system pressure can cause separation of air piping connections and air system valve failure.
Remedy, in the NHTSA record
The dealer will relocate the air system compressor governor line and pressure relief valve to eliminate moisture accumulation.
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 23 Aug 1978.
77V173000Received 12 Oct 1977. 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: 23 Mar 1978.
77V013000Received 1 Jan 1977. 830 units.
Service Brakes, Air / Drum
Defect, in the NHTSA record
Cracks may be present in the brake spider. These cracks could eventually cause the brake spider to fail. This could allow separation of that portion of the brake spider that retains the brake camshaft, the brake chamber, and the brake chamber bracket from the foundation brake assembly. Brake pull in the direction opposite the affected wheel location or wheel lock-up on the affected wheel could occur.
Remedy, in the NHTSA record
The dealer will inspect and modify the affected brake spiders, free of charge.
Report filed by MACK TRUCKS, INCORPORATED.
77V011000Received 1 Jan 1977. 2,200 units.
Steering / Gear Box (Other Than Rack and Pinion)
Defect, in the NHTSA record
The lower steering shaft yoke clamp bolts on the involved vehicles may not have been sufficiently tightened. Should these bolts lossen and come off, the lower steering shaft could separate from the steering gear.
Remedy, in the NHTSA record
The dealer will secure the clamp bolt and make the necessary modifications on the lower steering shaft, free of charge.
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 29 Mar 1977.
76V083000Received 9 Jun 1976. 404 units.
Service Brakes, Air / Drum / Chamber
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 4 Oct 1976.
76V060000Received 20 Apr 1976. 608 units.
Steering / Steering Wheel/Handle Bar
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 27 Oct 1976.
76V005000Received 13 Jan 1976. 790 units.
Visibility / Windshield Wiper/Washer / Motor
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 13 May 1976.
76V006000Received 13 Jan 1976. 350 units.
Service Brakes, Air / Antilock / Wheel Speed Sensor
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 13 May 1976.
75V139000Received 24 Jul 1975. 110 units.
Service Brakes, Air / Supply / Hoses, Lines/Piping, and Fittings
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 14 Nov 1975.
75V140000Received 24 Jul 1975. 402 units.
Steering / Steering Wheel/Handle Bar
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 15 Dec 1975.
75V141000Received 24 Jul 1975. 935 units.
Service Brakes, Air / Supply / Check Valve
Report filed by MACK TRUCKS, INCORPORATED. Owner notification date in the NHTSA record: 17 Nov 1975.

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.

19721
19731
19747
197513
19768
19778
19785
19794
19801
19811

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

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Official channels

NHTSA VIN lookupNHTSA shows the unrepaired recalls of one vehicle from its VIN or its license plate.
NHTSA: report a safety problemThe NHTSA form for a complaint about a vehicle, a tire, a child seat or equipment.
NHTSA page of the 1975 Mack WLThe recalls, the complaints and the investigations that NHTSA shows for this model year.

Cite this page

Recall Register. 1975 Mack WL: recalls and complaints. https://recallregister.com/vehicle/mack/wl/1975/. Source: NHTSA Office of Defects Investigation, recall, complaint and investigation files. Data through 29 Sep 2026.

Sources

Source: NHTSA Office of Defects Investigation
Licence: US government work, public domain
Recall file through: 29 Sep 2026
Complaint file through: 15 May 2019
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 1975 Mack WL?: 65,579 units in 13 campaigns. A campaign can name other models and model years, and its units include them.
How many recall campaigns does the Mack WL have for all model years?: NHTSA lists 22 recall campaigns for the Mack WL, model years 1972 to 1981. 13 of them name the 1975 model year.
Is an NHTSA investigation of the 1975 Mack WL open?: The NHTSA investigation file has no investigation that names this model year.