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)

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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

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

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