Mack unveils Load Logic, 6×2 with liftable pusher axle

LOUISVILLE, Ky. — Mack has introduced a Load Logic powertrain specification that can save fuel in applications where trucks regularly go out loaded and return empty.

Load Logic is available on the Mack Pinnacle and locks out 12th gear when the trailer is fully loaded, providing increased performance and pulling power. When an empty or lightly loaded trailer is detected, 12th gear is given back to the driver to lower cruise rpms and to maximize efficiency.

The new offering is integrated with Mack’s mDrive automated manual transmission and is part of its Super Econodyne powertrain package. The company says customers using this spec’ can reduce fuel consumption by 2% compared to a standard engine rating.

Roy Horton, Mack director of product marking, said at the Mid-America Trucking Show that Load Logic essentially provides two powertrains in one and its transformation from one to the other depending on load conditions is seamless to the driver.

Mack also introduced a 6×2 with liftable pusher axle, though Canadian customers would be well advised to check with regulators before ordering it. Canada currently prohibits the use of 6x2s, though enforcement is lax, if not non-existent. Still, the presence of a raised pusher axle may be enough to get their attention, so check your local regulations.

The 6×2 with liftable pusher axle measures payload using sensors in the rear suspension and lifts or lowers the foremost rear axle accordingly. When there is no load, the axle lifts, allowing the tractor to operate as a 4×2 for less drag and tire wear, and improved fuel economy. When a load is present, the axle is lowered for additional stability and proper weight distribution.

“The Mack Pinnacle model is already an ideal workhorse for weight and fuel-conscious customers,” said Horton. “With these new solutions, customers no longer need to choose between better efficiency and better productivity. Load Logic combines the performance of direct and overdrive transmissions into one, and our 6×2 with liftable pusher axle enhances traction, ride and handling characteristics, while still delivering increased productivity.”


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James Menzies is editor of Today's Trucking. He has been covering the Canadian trucking industry for more than 20 years and holds a CDL. Reach him at or follow him on Twitter at @JamesMenzies.

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