Mack Defense Delivers Heavy Dump Trucks to U.S. Army

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Mack Defense Heavy Dump Truck.

Mack Defense today delivered to the U.S. Army and the U.S. Army Reserve the first production M917A3 Heavy Dump Trucks (HDT) to roll off Mack Defense’s new production line at the Mack Experience Center (MEC).

The M917A3 HDT key and truck handover occurred during a ceremony at the MEC, following remarks from Mack Defense leadership, U.S. Army officials and representatives of local and state officials. Attendees were also provided a tour of Mack Defense’s new production facility.

The M917A3 trucks are part of the contract for HDTs that was previously announced between the U.S. Army and Mack Defense. The Army uses dump trucks in its Engineer units. They are used in construction and maintenance missions for important infrastructure assets such as roadways, airfields, landing strips, supply facilities, and motor pools.

"Many of the Army's missions are within extremely austere environments, so if we need to build things to support combat or training operations, dump trucks are absolutely essential to the force," said Wolfgang Petermann, the U.S. Army's project manager for Transportation Systems, Program Executive Office for Combat Support & Combat Service Support (Detroit Arsenal, Michigan).

The Army's current dump truck fleet includes some variants that are nearly 50 years old, Petermann said.

In May 2018, the U.S. Army awarded Mack Defense the contract that could be worth up to $296.4 million over seven years to produce up to 683 non-armored and armored M917A3 HDTs. The U.S. Army signed the agreement Nov. 30, 2020 to purchase 99 Mack Granite-based HDT’s after completing two years of successful Production Vehicle Testing of 12 vehicles at the U.S. Army’s Aberdeen Test Center in Aberdeen, Maryland, in accordance with the contract program timeline. Then on March 29, 2021 an additional order of 56 HDTs were placed as part of the 2021 Presidential budget.

Production of the HDTs at the MEC began in Q1 2021, following an investment of $6.5 million to create a dedicated HDT production line at the facility. The new production line helps fulfill the HDT contract with the U.S. Army and allows the production of other vehicle variants.

The production line in the MEC is in Mack’s former Customer Adaptation Center, where vehicle modifications occurred. The Customer Adaptation Center has since moved to Mack’s Lehigh Valley Operations (LVO) in Macungie, Pennsylvania, where all Mack Trucks Class 8 vehicles for North America and export are assembled. Previously, non-armored HDT vehicles started production at LVO and were then transported to the MEC, where final assembly, including adding the dump body, occurred.

The 94,500 lb. GVWR M917A3 HDTs based on the Mack Granite model feature an all-wheel drive 8x8 configuration. Mack Defense engineers increased the suspension’s ride height to create a heavy dump truck capable of meeting the requirements set by the U.S. Army HDT program. An armored cab was also engineered, utilizing all the comfort features and amenities of a commercial truck, while adding force protection to help keep occupants safe in hostile environments. The M917A3s are powered by 13-liter Mack MP8 engines, delivering 440 horsepower and 1,660 lb.-ft. of torque.