Mack R Steering problems by year

The steering arm can develop cracks causing the lever to break without warning.

Interference between steering gear sector shaft and the frame rail through hole can cause sector shaft wear and can weaken shaft cause it to break.

The pinch bolt hole center to steering gear input shaft on the lower yoke dimension exceeds specifications. If the pinch bolt becomes loose, it will not engage the steering gear input shaft notch and the shaft could slip off.

An improper pinch bolt and nut may have been used in the clamping of the steering shaft to the steering gear input shaft. Due to clamping force loads applied at the bolt, the nut could yield, resulting in looseness of the input shaft yoke. Should this...

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...