NHTSA Campaign Id 79V017000; Date: Jan. 12, 1979
1977 Mack DM; 1978 Mack DM; 1977 Mack R; 1978 Mack R; 1977 Mack RD; 1978 Mack RD; 1977 Mack U; 1978 Mack U
Component: Suspension:multiple Axle
Manufactured by: Mack Trucks, Incorporated
Affected Units:: 4,000
A casting deficiency exists in the lower section of the caps resulting in a reduction in the thickness of the material. Failure of a cap can allow the end of the rear spring to detach from the axle housing.
Dealer will inspect and, if necessary, replace any of the spring insulator caps found to be defective. This will be done at no cost to owner.
Vehicle description: trucks, heavy. System: suspension; insulator cap. Consequences of defect: loss of vehicle control can result and lead to avehicle accident.
Date Owners notified by Manufacturer: Aug 13, 1979
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