A semi-truck kingpin has more importance than you might think. So here are maintenance and repair tips for semi-truck kingpins.

What Is a Kingpin?

A semi-truck kingpin is a pivot point between the semitrailer and the tractor. It sets a distance from the center of the rear axle group to the center of the fifth wheel connection, affecting the vehicle’s turning radius. It’s an incredibly significant part of the semi-truck hauling setup, determining the success of long-distance transportation.

Keep an Eye Out for Wear

The goal of every semi-truck driver is to ensure that their semi-truck can drive optimally and functions for many years. However, proper kingpin maintenance is essential for appropriate semi-truck and trailer functionality. Signs of kingpin wear include incorrect wheel alignment, a present pull in steering, and uneven front-tire wear. Furthermore, a lack of lubrication is another sign of kingpin wear, causing unwanted friction and accelerated deterioration.

Furthermore, if a semi-truck driver ignores their kingpin, they can end up with more expensive structural repairs. Accident damage and poor maintenance practices result in kingpin wear, so practicing kingpin observation, repair, and maintenance is essential.

Maintain Kingpin Lubrication

One important tip for proper semi-truck kingpin maintenance that’ll prevent unnecessary repairs is to ensure optimal lubrication. A layer of grease keeps the kingpin from contacting the semi-truck bushings. Incorrect grease use can result in the protective layer breaking down, thus causing the bushing interior to erode from direct metal contact. It’s essential for overall parts and system longevity.

Semi-truck drivers should check for steering axle kingpin issues after their truck uses a lift. They can use a dial indicator for checking end play and logging findings. Doing this helps indicate when parts require replacement, thus preventing premature wear. Detecting kingpin wear by logging it is more efficient than observing your tires.

When To Replace a Kingpin

As semi-truck kingpins wear down, replacement becomes inevitable. They have an average life of 12.5 to 25 years, needing repair around every 5 years. So kingpin replacement will occur at least once during a semi-truck’s lifespan.

Semi-truck drivers can hire a professional to replace them, or they can do it on their own. The important thing to remember is that drivers should replace their worn-out kingpins as soon as they notice signs of wear, as it can become incredibly dangerous to drive.

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