Mack Ex­tends 6x2 Liftable Pusher Axle Ben­e­fits

Road Today - - Contents - RT

Mack Trucks has an­nounced Au­to­matic Standby Mode, a pi­o­neer­ing op­tion for its 6x2 liftable pusher axle avail­able on Mack Pin­na­cle high­way mod­els. The 6x2 with liftable pusher axle of­fers im­proved fuel ef­fi­ciency and pro­duc­tiv­ity ben­e­fits and is de­signed for ap­pli­ca­tions that haul out heavy and re­turn empty, such as bulk haul. The ad­di­tion of Au­to­matic Standby Mode elim­i­nates the need for the driver to man­u­ally push but­tons to ini­ti­ate standby mode, sim­pli­fy­ing op­er­a­tion. Mack has also added rear air disc brakes as an op­tion to it 6X2 liftable pusher of­fer.

When the ig­ni­tion is off, Au­to­matic Standby equal­izes the sus­pen­sion pres­sure, pre­vent­ing the rear axle from be­ing over­loaded. The driver does not have to re­mem­ber to ini­ti­ate the standby mode and also does not need to re­mem­ber the but­ton se­quence to put it in standby.

The 6x2 with liftable pusher axle mon­i­tors trailer weight and ad­justs the truck’s driv­e­line con­fig­u­ra­tion to boost fuel ef­fi­ciency with­out im­pact­ing per­for­mance. The 6x2 with liftable pusher axle is ca­pa­ble of de­ter­min­ing pay­load by us­ing sen­sors in the rear sus­pen­sion and ei­ther lift­ing or low­er­ing the fore­most rear axle. When an empty load is de­tected, the axle lifts, al­low­ing the trac­tor to op­er­ate as a 4x2 for less drag, bet­ter fuel ef­fi­ciency and re­duced tire wear, which helps lower main­te­nance costs. For full loads, the same axle is low­ered to pro­vide ad­di­tional sta­bil­ity and dis­tri­bu­tion of the trailer’s weight.

To de­liver op­ti­mal trac­tion, the sys­tem’s sus­pen­sion pres­sure and ride height are con­tin­u­ously mon­i­tored and ad­justed to main­tain a load bias to­ward the drive axle. In ad­di­tion, three driver-se­lectable trac­tion con­trol modes are avail­able via a dash-mounted switch.

Dur­ing nor­mal op­er­a­tion, con­trol of the lift axle is au­to­matic based on pay­load. The sys­tem of­fers a man­ual con­trol fea­ture that en­ables a driver to raise or lower the sus­pen­sion for eas­ier land­ing gear re­trac­tion or trailer hook-up re­spec­tively.

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