Mack Defense
Allentown, PA
1 (800) 866-1177

Mack Defense is partnering with Crysteel Manufacturing on the U.S. Army M917A3 Heavy Dump Truck (HDT) contract to provide specialized dump bodies that provide several key safety and functionality features to meet the specialized needs of the U.S. Army.

Developed in close collaboration with Mack Defense, the Crysteel dump body for the M917A3 is designed to provide maximum durability, safety and functionality out in the field. Crysteel engineers developed an integrated touchscreen control module, which places key safety and functionality information at the operator's fingertips. From this integrated hub, the driver is able to control the hoist, tailgate, tarp, thermostatic body heater system, material control system, the inclinometer and the onboard weigh scale.

The Mack Defense M917A3 HDT is based on the commercial Mack Granite model and has been optimized to meet the current needs of the U.S. Army. Mack Defense added heavier-duty rear axles, all-wheel drive, increased suspension ride height and incorporated other rugged features to ensure the M917A3 is capable of meeting the demanding payload and mobility requirements set by the U.S. Army HDT program. An armor cab was also engineered which utilizes all the comfort and amenities of a commercial truck, while adding force protection to keep occupants safe in hostile environments.

The 94,500 lb vehicle is powered by a Mack 13 liter, MP8 440 engine that produces 440 HP and maximum torque of 1660 lb-ft, delivered through a sturdy Allison 4500 Gen5 with prognostics 6-speed transmission. The front suspension consists of a Meritor MX-810 axle riding on a taperleaf spring suspension (parabolic) in the axle-forward position. Rear suspension consists of P600/Pro Tec Series 50, 76,800 lb Meritor 34836 mounted on a Primaxx Pax 792 high stability 76,800 lb. suspension. The trucks wheelbase is 243-inches with 75-inches of overhang.

The first five trucks were delivered to the U.S. Army in June of this year.

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