TECH TIPS

MACK TRUCK RECALL

Mack Trucks is recalling certain 2018-2022 Anthem, Granite, and Pinnacle vehicles equipped with "camelback" rear suspension and electronic stability control. The vehicles may not stay in their lane at certain speeds. As such, these Stability Control Systems on Heavy Vehicles." A vehicle that drifts out of its lane increases the risk of a crash. NHTSA says potentially 566 vehicles are affected by this recall.

For the most part, the typical vehicle in our shops are not 2018 and up. But this is an indication that the world of

being aware of sensors and wiring, albeit on suspensions, is near. Please advise on newer vehicles to be aware of wiring that typically has not been present ever on suspensions.

TROUBLESHOOTING BRAKE IMBALANCE IN CLASS 8 TRUCKS

What is brake balance? A vehicle’s brakes are said to be in balance if all brakes apply and release at about the same time, with each brake developing the appropriate braking force for its weight load.
On the other hand, brake imbalance, such as when a tractor brakes faster and more aggressively than its trailer, causes rapid lining wear on the hardest-working brakes, bumping of tractors by trailers, jackknifing and panic stops with more panic than stop.

AUTOMATIC SLACK ADJUSTERS

Don Jones shares a Tech Tip on brake systems and automatic slack adjusters.

4 WAYS TO PREVENT TRUCK WHEEL-OFFS

The causes of wheel separation are well known. They include bearing failures; loose, broken, or missing wheel fasteners; damaged wheels, and to a lesser degree, failures of certain axle and suspension components. What's not as well understood is why these events continue to occur.

TIGHT BUT NOT TOO TIGHT WHEEL BEARING ADJUSTMENTS

Bearing failures are less common than fastener-related separations, 26%compared to 65%,say several investigative reports on wheel separations.

HOW TO PREVENT WHEEL-END FIRES

Millions of dollars’ worth of equipment and cargo goes up in smoke every year because of wheel-end fires, euphemistically called thermal events. You’ll see it on the news or social media, with dramatic footage of thick black smoke and flames consuming an entire trailer — and the tractor, if the driver can’t get the two units unhooked fast enough.

But determining how and where the fires start continues to frustrate the maintenance community, because the damage is often so severe, there’s little left pointing to a cause.