Mack Trucks has expanded its MD Series line with a new 23,000-lb. rear axle offering and a 325 hp engine rating.

Mack says the move expands its versatility, opening it to more applications. The engine is a Cummins B6.7.

The heavier rear axle and suspension are designed for heavier payloads, ideal for refuse packers with 11- to 20-yard rear loaders and trucks fitted with water tanks holding up to 2,500 gallons.

And Mack says the combination of beefier rear axle with 325-hp engine and Allison 3000RDS transmission are capable of increasing towing capacity if the truck is pulling a trailer.

“The 23,000-lb. rear axle expands the applications in the vocational market – with refuse and construction reaping the most benefits,” said Tim Wrinkle, Mack vice-president of vocational and medium duty. “The 325-hp also offers carriers traversing longer routes or in a hilly or mountainous region a more durable and reliable powertrain. The rear axles on those truck models equipped with a dump body, hook lift or roll-offs take some abuse during the truck’s lifespan. The heavier axle rating has better durability, and the larger horsepower engine will provide enhanced performance.”