Pitman Arm
A steering linkage component that connects the steering gear box to the center link, translating rotational steering force into linear motion.
The Pitman arm is a heavy-duty metal linkage used in vehicles equipped with traditional recirculating ball steering gear boxes, common on older passenger cars, trucks, SUVs, and heavy-duty commercial vehicles. It is bolted directly to the output shaft (sector shaft) of the steering box. When the driver turns the steering wheel, the steering box rotates the sector shaft, which swings the Pitman arm in an arc.
This swinging motion translates the rotational output of the steering gear into the lateral (side-to-side) linear force needed to move the steering linkages (center link and tie rods), which ultimately turns the front wheels. The Pitman arm typically contains a ball joint or connects to one on the steering center link to allow for suspension flex.
As a critical steering component, the Pitman arm and its connection point are subject to high loads and wear. When the internal joint wears out and develops play, it leads to loose steering, a steering wheel that "wanders" or has excessive free play, and clunking noises during turns. A worn Pitman arm is a safety hazard and must be replaced to restore steering control and pass vehicle inspections.