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Mack U (1971) – 78V171000

Vehicle recall defect – 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.


Mack U (1974) – 78V171000

Vehicle recall defect – 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.


Mack U (1974) – 78V068000

Vehicle recall defect – 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.


Mack U (1974) – 77V173000

Vehicle recall defect – 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.