Heavy Dump Truck

M917A3
HEAVY DUMP TRUCK

M917A3 Heavy DumpTruck

The Mack Defense M917A3 Heavy Dump Truck is a commercially-based Mack® Granite® dump truck, engineered to be the best-in-class tactical vehicle solution from the only company that can deliver these unparalleled capabilities to the U.S. Army. Mack Defense assembled a world class team with one purpose in mind — to provide the U.S. Army with a best-in-class heavy dump truck that meets all military requirements.

Downloadable Specification Sheets (.pdf)

Downloadable Brochures (.pdf)

Prepared for anything. The HDT is designed to match the demands of the most severe conditions.


MP®8

Saving up to 2.5% in fuel and shedding 88 lbs in weight, Mack’s workhorse MP®8 engine offers up to 520 HP and 1,860 lb-ft of torque and the Euro 3 version is also available at 520hp and 1,844 lb-ft of torque.

6×6 or 8×8 Axle and Suspension Configurations

The Meritor® axles coupled with the Mack front parabolic spring and the Hendrickson rear Primaxx® suspension provides unparalleled ride quality with a fully loaded or empty payload.

Standard Cab or Optional Armor Cab

The cab design and driver environment are built around the way the work gets done – keeping drivers comfortable, safe, and focused all day long.

Specifications Overview
  • Up to 27 ton payload capacity
  • Up to 18 cubic yard dump
  • Diesel engine compatible with JP8
  • 2 person cab
  • Air lift ability
AWD Components
  • Front drive
  • Transfer case
  • High ground clearance air ride suspension
  • Tandem or tridem rear axle

The Cornerstone Chassis

This truck chassis off road superiority gives it the flexibility to transform into multiple mission capable platforms with proven success. The adaptability provides the military a diverse portfolio of tactical and logistical support equipment. The chassis is built strong (rock-solid) and when combined with a crane can offer an all-terrain solution capable of 30 to 60 tons. Making it the perfect tool for light, medium, and heavy lifts.

CHASSIS TESTING

Mack has plenty riding on our Cornerstone chassis. Components were tested for fatigue; the rails and crossmembers were stressed and relentlessly checked for endurance.

WHEEL CUT

The best All Wheel Drive truck maneuverability ever from Mack. The Cornerstone chassis design allows increased wheel cuts for improved handling around the job site.

FRAME RAIL

The 300 mm constant frame rail height and high strength steel alloy in conjunction with a full length channel liner provide for optimal strength and payload capabilities. The frame system includes a full channel liner in each rail that runs front to rear within the Mack Defense M917A3 Heavy Dump Truck. This provides for optimal strength and payload capabilities.

CROSSMEMBERS

Developed by Mack design engineers and harshly tested by perfomance engineers – superior strength and stiffness is achieve through the use of eight crossmembers located along the frame rails where loads are imposed

ENGINE MOUNTS/CAB ISOLATORS

New engine mounts and cab isolators reduce noise and vibration — decreasing driver fatigue and improving productivity.

APPLICATIONS

Offers military users the capability of transporting supplies on logistic and tactical missions.

ADDITIONAL APPLICATIONS COULD INCLUDE – RADAR, TROOP CARRIER, WRECKER, TANKER, HEAVY EQUIPMENT TRANSPORT, AND OTHERS VEHICLES

Constructed with purpose. Prepared for anything.

HIGH CAPACITY DUMP BODY

High strength steel, Up to 18 cubic yards, Heated dump body

OPTIONAL SPARE TIRE CARRIER

Mounted vertically between back of cab and dump body

TAILGATE ASSEMBLY

Standard Swing Gate, Optional Material Control System (MCS), Optional shoots for specific materials

ELECTRICAL OPTIONS

Collision Warning System, Military Lighting, NATO Slave Receptacle, 12/24V Electrical System, 12V SAE and 24V NATO Trailer Connections

OPTIONAL LIFTING, TIE-DOWN, AND TOWING

Front bumper assembly – multipurpose HDT design with lifting eye and tie down feature and brush guard, Rear tie down/towing, Side lifting loop (Attached to frame)

Static Stability - Tilt Table

Mobility Testing

Speed, Stop and Start 30% Grade

16 and 20 Inch Vertical Step

Tested, tried, and true platform


The M917A3 HDT has passed its ruggedness challenge at the Nevada Automotive Testing Center. Passing these tests was especially important for the M917A3 and proved its design is ready to tackle the most rugged terrain. Clearly, the M917A3 has proven it has got the capability you need to take on tough jobs.

Test Result
Vertical Step
Step Static stability on tilt table
Wall-to-wall turning circle
Trench crossing
Speed on 0% grade
Speed, stop and start 30% grade
Steady state turning
Ride quality – half rounds
Side slope
Mobility Testing
Environmental
Fording – 20 inches
Standard is -25oF to 120oF, can go to -40oF to 120oF with addition of cold weather kit
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Meritor Protec Series 50 Rigid Tridem Axle

  • Gross axle weight rating (GAWR) of 30,000 lbs per axle
  • 3.46:1 Planetary geared wheel-end
  • Standard Driver-Controlled Differential Lock (DCDL) or automatic locking options
  • Central Tire Inflation System – (CTIS) and ABS-ready
  • Air disc brake or drum brake options

Meritor MX-810 Front Drive Steer Axle

  • Gross axle weight rating (GAWR) of 23,000 lbs
  • Standard Driver-Controlled Differential Lock (DCDL) or automatic locking options
  • Meritor bevel gear wheel-end reduction axles exceed the demanding requirements of the current Family of Medium Tactical Vehicles (FMTV)
  • 35°–38° turn angle for excellent maneuverability
  • EX+ air disc brakes standard or optional drum brakes
  • ABS-ready wheel ends with installed tooth wheel and sensor

Meritor Permalube™ RPL Series Driveline

  • Permanently lubricated and sealed for life – reduced maintenance and operating costs
  • Extended U-joint life to handle difficult terrains
  • Triple lip seals provide protection against contaminants
  • Nylon thrust washers eliminate metal-to-metal contact to prevent wear
  • Four-bolt design for easy installation and service
  • E-coated steel guard secures and protects the slip seal against contaminants and damage

Meritor MTC-3220FV (TC-142) Transfer Case

  • Speed – 3,000 RPM
  • High Input Torque – 20,000 lb-ft
  • Ratios – 1:1 and 2.23:1
  • Combined splash and pressurized lubrication system
  • Optional Full Power PTO, Integral Air Range Shift
  • High-torque helical high range gears with tapered roller bearings

Dump Body


  • 17′ Long Crysteel Select Dump Body
  • 18-22 yard capacity
  • Front Material 3/16″ AR450
  • Side Material 3/16″ AR450
  • Tailgate Material 3/16” AR450
  • Floor Material ¼” AR450
  • Heated Tubular Longsills and side rubrails
  • Std or Material Control System Tailgate Option
  • 50″ Cab protector
  • 12″ rear spill shield portable ladder access steps outside and inside, left front corner tire chain storage boxes, both sides asphalt tarp

Dump Body Cylinder

Chrome plated T74167 7″ barrel, 4 stages, 167″ stroke to achieve 50 degree dump angle

Includes Control Module with touch screen display to:

  • Operate dump body hoist
  • Operate the tarp and tailgate latch
  • Operate the body heater system
  • Operate the MCS doors
  • Inclinometer to show side slope and grade
  • Automatic shut down of the hoist if over 7% side slope or 15% uphill grade
  • On Board weigh scale
MackDefensePlants_GTO-On-HDT-Page

Armor Scalable Solutions.

Whatever the mission, this unique armored body system is designed to withstand the most challenging conditions.

WEIGHTS/DIMENSIONS

  • GVW: 94,500 lbs
  • Wheel Configuration: 8×8
  • Frame: 300mm X 90mm X 11.1mm with steel reinforcement frame
  • Wheelbase: 243″
  • Platform: 230″
  • Overhang: 75″

POWERTRAIN

  • Type: Mack 13 Liter, MP8 440
  • Max Power: 440 HP
  • Max Torque: 1660 lb-ft
  • Engine Brake: Engine brake, plus exhaust pressure governor (for HE/Export)
  • Fan Drive: Electronic modulating viscous fan drive
  • Air System: Meritor®/Wabco 636 (37.4 cfm) w/o clutch
  • Starter: 24 Volt
  • Alternator: High output, 24V alternator

DRIVELINE/TRANSMISSION

  • Driveline: Meritor® Permalube RPL
  • Transmission: Allison® 4500 Gen5 with prognostics, 6-speed
  • Brakes: Meritor® EX+ air disc brakes front, Meritor Drum 16.5”x7” Q+ rear
  • ABS System: 6S/6M system
  • Front/rear Tires: 445/65R22.5 L Michelin® XZY3
  • Transfer Case: Fabco TC142

AXLES/SUSPENSION

  • Front Axle: Meritor® MX-810
  • Front Suspension: Taperleaf spring suspension (parabolic), axle-forward position
  • Rear Axle: P600/ProTec Series 50, 76,800 lb Meritor® 34836
  • Carrier Ratio: 6.14
  • Rear Suspension: Primaxx® Pax 792 high stability 76,800 lb

CAB/CHASSIS

  • Driver Seat (non-armored): Mack-air, high back, 1 chamber air lumbar
  • Passenger Seat (non-armored): Mack-air, high back, 1 chamber air lumbar
  • Mirrors (both sides): Aero black, heated/motorized, wide angle, w/o lamps
  • Spare Tire: Spare tire/carrier between dump body and cab
  • Left Side Fuel Capacity: P93 gal (350 L), 26″ aluminum d-shape
  • Right Side Fuel Capacity: N/A

CUSTOMIZED OPTIONS AVAILABLE TO MEET MISSION REQUIREMENTS

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Canada Armed Forces Takes Delivery Of 1st Mack Defense Kerax Trucks

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Mack Defense Presents U.S. Army with Keys To First M917A3 Heavy Dump Trucks

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Mack Defense Presents U.S. Army with Keys To First M917A3 Heavy Dump Trucks

Description

Mack Defense President David Hartzell (top left) officially presented the first five Mack® Granite®-based M917A3 heavy dump trucks (top right) to the U.S. Army during a ceremony at the Mack Customer Center (bottom).

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Mack

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Mack Defense Honored with President’s ‘E’ Award for Exports

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Mack Defense was recently named a recipient of the President’s “E” Award for Exports, the highest recognition any U.S. entity can receive for making a significant contribution to the expansion of U.S. exports.

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Dave Hartzell and Rob Gordon accepting the Award on behalf Mack Defense
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Mack Defense M917A3 HDT Dump Body

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Mack Defense M917A3 Armored Heavy Dump Truck

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Mack Defense M917A3 Heavy Dump Truck

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Mack Defense M917A3 Heavy Dump Truck

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Mack® Granite® Wrecker

Description

The Mack® Granite® Wrecker is a rugged and reliable truck. It features a fuel-efficient, 13-liter Mack MP8 engine that delivers plenty of horsepowers (440 HP), plus great low-end torque (up to 1,660 lb.-ft.) to provide you with the muscle to conquer any challenge and the endurance to work all day long. It is built on the proven Mack Cornerstone™ chassis that delivers rock-solid performance as it provides a constant frame rail height and sits high off the ground for maximum ground clearance over rough terrain.

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Mack

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Mack® Granite® Troop Carrier

Description

The Mack® Granite® Troop Carrier is a rugged and reliable truck. It features a fuel-efficient, 13-liter Mack MP8 engine that delivers plenty of horsepower (400 HP), plus great low-end torque (up to 1,460 lb.-ft.) to provide you with the muscle and the endurance needed to support your operations. It is built on the proven Mack Cornerstone™ chassis that delivers rock-solid performance. Its galvanized steel cab mounted on airbags and shocks and stabilized with sway bars soaks up the rough road for a smooth ride.

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Mack

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Mack® Granite® Water/Fuel Tanker

Description

The Mack® Granite® Water/Fuel Tanker is a rugged and reliable truck. It features a fuel-efficient, 13-liter Mack MP8 engine that delivers plenty of horsepowers (345 HP), plus great low-end torque (up to 1,360 lb.-ft.) to provide you with the muscle and the endurance needed to support your operations. It is built on the proven Mack Cornerstone™ chassis that delivers rock-solid performance as it provides a constant frame rail height and sits high off the ground for maximum ground clearance over rough terrain.

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Mack

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Mack Defense Builds Final Truck For Canadian Medium Support Vehicle System (MSVS) Program

Description

Mack Defense has assembled the 1,587th and final truck for the Medium Support Vehicle System (MSVS) Standard Military Pattern (SMP) program. The truck rolled off the assembly line on Feb. 13 in Saint Nicolas, Quebec in front of a select group of dignitaries, military officials and Mack Defense employees. Pictured from left to right are MSVS trucks in Cargo, Load Handling System (LHS), Material Handling Crane (MHC), and Material Repair Truck (MRT) variants.

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Mack Defense To Spotlight 60-Ton Line Haul Vehicle At AUSA

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Mack Defense will showcase its 60-ton Mack® Granite®-based Line Haul truck during the AUSA 2021 Annual Meeting and Exposition, Oct. 11-13 at the Walter E. Washington Convention Center in Washington, D.C.

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Mack Defense Headquarters Relocates To The Mack Customer Center

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Mack Defense has relocated its headquarters to the Mack Customer Center (MCC) located in Allentown, Pennsylvania to better serve customers through enhanced ability to support its contracts. The recently completed move also provides Mack Defense additional working space and access to other MCC amenities.

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Mack Customer Center

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Mack Defense Starts M917A3 Heavy Dump Truck Production At Mack Experience Center

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Mack Defense is now producing Heavy Dump Trucks (HDT) at the Mack Customer Center, following an investment of $6.5 million to create a dedicated production line at the facility.

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Mack

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MSVS SMP Military-Grade: Efficient Performance Meets Military Readiness

Description

The Mack Defense family of militarized rigid trucks and tractors is based on commercial vehicles which are adapted to the specific needs of armed forces. They can be suited for logistic missions and are able to be modified for tactical missions with improved off-road capacity and air transportability.

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Mack

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First Generation Mack

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M917A3 Heavy Dump Truck

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Durable Components

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Mack Bulldog

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M917A3 HDT

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Mack Defense announced it partnered with TenCate Advanced Armor USA to provide a force protection system for the Mack® Granite®-based M917A3 Heavy Dump Truck (HDT) and other Mack Defense vehicle platforms.

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Mack

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armored truck
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Granite Dump Truck
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Scalable Armor Solutions

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Mack

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armored truck
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Granite
Granite Dump Truck
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Military

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Heavy Dump Truck

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Michigan Engineer Company One Of First National Guard Units To Test Mack Truck In Field

Description

The heavy dump truck arrives in Michigan. The 1434th Engineer Company, Michigan National Guard, fielded the dump trucks on April 14, 2022, in Lansing, Mich., becoming one of the first Army units to receive the technologically advanced vehicle.

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President Biden Visits Mack LVO Facility 1

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Mack Trucks today hosted President Joe Biden at its Lehigh Valley Operations (LVO) facility in Macungie, Pennsylvania, where all Mack heavy-duty models for North America and export are assembled. Biden stressed the importance of American manufacturing, buying American products and good-paying jobs during remarks made at the facility. Left to Right, UAW Local 677 Shop Chairman Kevin Fronheiser, President Joe Biden and Martin Weissburg, Mack Trucks president, at Mack’s LVO facility.

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