The center link is hinged on the opposite end of the pitman arm by means of an idler arm (fig. 8-19). The idler arm supports the free end of the center link and allows it to move left and right with ease. The idler arm bolts to the frame or subframe.

Pitman Arm
The pitman arm transfers steering mechanism motion to the steering linkage (fig. 8-19). The pitman arm is splined to the steering mechanisms output shaft (pitman arm shaft). A large nut and lock washer secure the pitman arm to the output shaft. The outer end of the

Ball Sockets

Ball sockets (fig. 8-19) are like small ball joints; they provide for motion in all directions between two connected components. Ball sockets are needed so the steering linkage is NOT damaged or bent when the wheels turn or move up and down over rough roads. Ball sockets are filled with grease to reduce friction and wear. Some have a grease fitting that allows chassis grease to be inserted with a grease gun. Others are sealed by the manufacturer and cannot be serviced.

Figure 8-19.- Parallelogram steering linkage.

Tie-Rod Assemblies
Two tie-rod assemblies (fig. 8-19) are used to fasten the center link to the steering knuckles. Ball sockets are used on both ends of the tie-rod assembly. An adjustment sleeve connects the inner and outer tie rods. These sleeves are tubular in design and threaded over the inner and outer tie rods. The adjusting sleeves provide a location for toe adjustment. Clamps and clamp bolts are used to secure the sleeve. Some manufacturers require the clamps be placed in a certain position in relation to the tie rod top or front surface to prevent interference with other components.