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United States Mack Defense
M917A3 Heavy Dump Truck
An 8x8 heavy dump truck built on the commercial Mack Granite chassis and adapted to US Army specification, carrying up to 27 tons of payload in an 18-cubic-yard steel dump body. Mack Defense delivered its 500th production unit to the Army by 2025.
In service since 2022
Compiled from public sources ·primary reference ↗
Pricing: Unit cost not publicly disclosed
Procurement snapshot
Availability & export
US ITAR-controlled
Export needs U.S. State Dept (DDTC) approval; end-use & re-transfer restrictions apply.
Channel: Foreign Military Sales (FMS) or Direct Commercial Sale
Fielded & proven
Operator data not public
In service since 2022. Status: active.
Lifecycle cost (est.)
No public unit price to model from. Why so few systems publish one →
Interoperability
No standardised NATO calibre / datalink detected in public specs.
Competitive field
No comparable systems in its class from another manufacturer in the WeaponSpecs database yet. That is a gap in this catalog, not evidence that none exist. Browse the class →
Derived guidance from public data, export regime by country of origin, lifecycle from the GAO ~30% acquisition rule. Verify eligibility, pricing and offsets with the manufacturer and your acquisition authority.
Overview
The Mack Defense M917A3 Heavy Dump Truck (HDT) adapts the commercial Mack Granite chassis to US Army logistics and engineering requirements, replacing the legacy M917-series dump truck fleet. It is built in an 8x8 configuration with all-wheel drive, reinforced axles, a central tire inflation system and Mack's PRIMAAX EX rear suspension for cross-country mobility, and is powered by a 440-horsepower Mack MP8 13-liter diesel engine (with a 520-horsepower/1,860 lb-ft option) paired to an Allison 4500 Gen5 six-speed automatic transmission and a Meritor MTC-3220FV transfer case. The standard-cab variant carries up to 27 tons of payload (94,500 lb gross vehicle weight) in a heated, 18-cubic-yard steel dump body suited to earthmoving, road-construction and general engineering-support missions. Mack Defense began serial production in 2022 and delivered its 500th production M917A3 to the US Army by 2025, alongside a follow-on order for 450 additional trucks announced in 2025.
Full specifications
Physical
Dimensions, weight and crew.
| Combat weight Fully loaded weight. Lighter eases transport and bridging limits; heavier often means more armor. | 42,864 kg |
|---|---|
| Crew Personnel required to operate. Fewer reduces exposure; autoloaders trade a loader for mechanical complexity. | 2 |
| Cargo payload Maximum cargo the transport can carry. Higher means more lift per sortie. On an unmanned ground vehicle, this is the maximum mission payload the platform carries, including a weapon station. | 24,494 kg |
Propulsion
Engine, power and fuel.
| Engine Powerplant model and type. | Mack MP8 13-liter diesel (dual-fuel, JP8-capable) |
|---|---|
| Engine power Engine output power. Higher moves more weight faster. | 440 hp |
| Propulsion type Turbofan, turboshaft, diesel, gas turbine, solid-fuel rocket, ramjet… | Diesel, 8x8 wheeled, all-wheel drive with central tire inflation system (CTIS) |
Specifications compiled from public Mack Defense and reference sources ↗. Published defense figures are approximations, treat comparisons as directional. Last verified 2026-08-24.
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AVIC (Aviation Industry Corporation of China) KJ-2000 (Mainring) Frequently asked questions
How much does the Mack Defense M917A3 Heavy Dump Truck weigh? +
The Mack Defense M917A3 Heavy Dump Truck has a combat weight of 42,864 kg.
How many crew does the Mack Defense M917A3 Heavy Dump Truck require? +
The Mack Defense M917A3 Heavy Dump Truck requires a crew of 2.
What engine does the Mack Defense M917A3 Heavy Dump Truck use? +
The Mack Defense M917A3 Heavy Dump Truck is powered by the Mack MP8 13-liter diesel (dual-fuel, JP8-capable).
What is the Mack Defense M917A3 Heavy Dump Truck used for? +
The Mack Defense M917A3 Heavy Dump Truck is a other typically used for logistics, engineering support.
How much does the Mack Defense M917A3 Heavy Dump Truck cost? +
Mack Defense M917A3 Heavy Dump Truck: Unit cost not publicly disclosed. Defense program costs are rarely fully public and vary by contract and configuration.
