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King Pins For Peterbilt Trucks
The king pin is the pivot point of the steer axle on a Peterbilt truck — every steering input, every bump, and every loaded mile transfers through the king pin and its bushings. Worn king pins cause excessive steering play, accelerated tire wear, shimmy at highway speeds, and can create dangerous handling characteristics on a loaded Class 8. We carry king pin kits, king pin sets, and related steer axle hardware for Peterbilt trucks running common front axle configurations from Dana, Meritor, and other OEM suppliers.
Frequently asked questions about king pins
How do I know when king pins need to be replaced on a Peterbilt?
The standard test is to use a dial indicator or king pin gauge with the front of the truck raised and the wheel supported. Measure lateral play at the top and bottom of the wheel — most manufacturers specify a maximum of 0.030–0.050 inches of total play before replacement is required. A simpler field check is to grab the tire at 3 and 9 o'clock and attempt to rock it — perceptible in-and-out movement indicates worn king pin bushings. Excessive king pin wear is a common roadside inspection out-of-service violation.
Do I need to replace king pins and bushings together?
Always replace both together. Worn bushings cause accelerated king pin wear, and installing a new king pin into worn bushings — or new bushings onto a worn king pin — will result in rapid wear of the new components and a premature repeat repair. King pin kits that include the pin, bushings, thrust bearings, seals, and hardware are the correct way to service the king pin joint and ensure all wear components are addressed in a single job.
How often should king pins be lubricated on a Peterbilt steer axle?
Most axle manufacturers recommend greasing king pin zerks every 25,000 miles or at each PM service interval, whichever comes first. Trucks operating in severe conditions — off-highway, frequent water crossings, or heavy urban stop-and-go — benefit from more frequent lubrication. Use a high-quality chassis grease meeting NLGI Grade 2 specifications, and pump grease until fresh grease purges from the seals to ensure the joint is fully charged. Neglecting king pin lubrication is the single most common cause of premature king pin and bushing failure.