Mack CH Steering problems by year

On certain truck chassis, the steering gear mounting bolts were made of inconsistent bolt material, which has led to bolt failures. This inconsistent bolt material condition could result in a failure of a steering gear mounting bolts. The steering gear is...

On certain truck chassis, the steering gear mounting bolts were over-torqued at installation. The steering gear is mounted to the vehicle's frame rail with 3 bolts.

On certain chassis equipped with dana steering axle assemblies. These axles are built with an integral knuckle and steering arm. The steering arm could have longitudinal cracks.

On some heavy duty class 8 vehicles equipped with arvinmeritor axle assemblies which may have been manufactured with trw model 20edl ball sockets, the tie rod ball-socket bearings have a below specification case depth and/or hardness which can lead to...

On certain class 8 chassis equipped with r. H. Sheppard "m100" steering gears and trw "tas65" steering gears, a power steering hose with an incorrect pressure rating was installed by the factory.

On certain class 8 heavy duty trucks equipped with r. H. Sheppard m90 steering gears, an incorrect hose was used for the high-pressure line between the power steering pump and the steering gear. The hose is rated at 2000 psi, while it should be rated at 3000...

Vehicle description: trucks equipped with e-tech engines. A condition exists on the auxiliary drive shaft of the e-tech engine that causes the loss of power steering on vehicles where the power steering pump is mounted off the front of the engine.

Vehicle description: heavy duty trucks equipped with trw tie rod ends on certain dana/spicer axles (e12001) and mack axles through dana heavy axle (fawl 12). The tie rod and drag link ball stud ends contain bearings that are below the specified case depth...

Vehicle description: heavy duty trucks equipped with drag link assemblies containing 24-dl model ball sockets and manufactured by trw. Certain of the tie rod ball-socket bearings have a below-specification case depth and/or hardness, which can lead to...

Vehicle description: heavy duty trucks equipped with trw tie rod ends on certain meritor axles. The tie rod and drag link ball stud ends contain bearings that are below the specified case depth and/or hardness.

Vehicle description: class 8 heavy duty trucks. During assembly, insufficient torque occurred of the drag link to the axle steering arm connection. If the drag link to axle sttering arm connection is not torqued and the cotter pin is not installed, the nut...

The upper and lower pinch bolt on the steering pitman arm and the lower pinch bolt connection on shephard power gears were not torqued correctly.

Steering wheel retaining nuts may have been improperly installed and/or torqued.