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With a rated payload of 101.6 U.S. tons, the HD785-8 is ready to produce in your mining, quarry, and aggregate applications. The Komatsu SAA12V140E-7 engine provides 1,140 net horsepower for excellent speed-on-grade. Oil-cooled, multiple-disc brakes on the front and rear wheels offer excellent brake-retarding capability when descending grades.
Auto idle shutdown: Control unnecessary fuel consumption. When the engine is idling for the set time — adjustable from five to 60 minutes — the auto idle shutdown function automatically stops and applies the parking brake. Selectable operating modes: Your operator can choose between two operating modes: Economy mode to save fuel or Power mode for enhanced performance. Variable Horsepower Control: The Variable Horsepower Control system is designed to deliver you high production with low fuel consumption. It automatically detects whether the machine is loaded or unloaded and selects the best horsepower setting. Turning radius: The MacPherson-strut-type independent front suspension features an A-arm design for wider spacing and easy access to the engine bay. The turning angle is a tight turning radius of 33' 2." The smooth ride helps to reduce material spillage, too. Wet multiple-disc brakes and retarder: Fully hydraulic-controlled wet multiple-disc brakes on all four wheels help promote reliable and stable brake performance. Large-capacity, continuously-oil-cooled, multiple-disc brakes also function as a responsive retarder for operator confidence at higher downhill speeds. K-ATOMiCS transmission: Komatsu Advanced Transmission with Optimum Modulation Control System (K-ATOMiCS) helps avoid unnecessary fuel consumption, reduce material spillage and provide a smoother ride for operators by automatically selecting a gear position depending on grade, speed and acceleration. Automatic Retard Speed Control: The Automatic Retard Speed Control (ARSC) allows your operator to set the desired downhill travel speed. The ARSC system automatically applies the brake retarder to maintain that setting, enabling the operator to stay focused on the haul road. Komatsu Traction Control System: The Komatsu Traction Control System (KTCS) monitors the rear wheels for slippages and automatically applies the brakes independently to each wheel for enhanced traction. This function occurs automatically without operator input and without compromising steering performance. All-around monitoring: KomVision provides your operator with a 360-degree view of the surrounding work area on a dedicated monitor located in the dash via a six-camera system. Integrated Payload Meter: Enhance payloads, promote productivity and control the life cycle costs of your truck. The Integrated Payload Meter (PLM) manages the payload of each hauling cycle, analyzing the production volume and the working conditions of the machine. Ground-level service center: Designed for quick preventative maintenance and servicing. A ground-level service center is located at the bottom of the hydraulic tank: Engine oil, transmission and brake cooling oil, brake control oil and hydraulic oil filling ports are accessible in one location. Zero-harm features: Lockable battery and starter isolators are accessible from the ground level. A machine immobilization switch enables engine ignition yet disables steering and hoist operation while preventing parking brake release. An emergency engine stop switch shuts down the engine from the ground level. |
| Body | |
|---|---|
| Cab | Standard—FOPS (ISO 3449 level II), ROPS (ISO 3471) |
| Frame Type | Box-sectioned structure |
| Material | 400 brinell hardness high tensile strength steel |
| Material Thickness | Bottom: 0.75” Front: 0.47” Sides: 0.35” |
| Structure | Material: V-shape body |
| Body Capacity | Struck: 52.3 yd³ Heaped: 78.5 yd³ |
| Dimensions | |
|---|---|
| Weight | 365,967 lbs. |
| Turning Radius | 33’2” |
| Overall Length | 37’0” |
| Overall Width | 14’2” |
| Overall Height | 18’11” |
| Steering Angle | 41° |
| Ratio | Differential: 3.538 Planetary: 4.737 |
| Planetary | 7.235 |
| Brake Surface | Front: 6,075 in² Rear: 11,138 in² |
| Target Area | 23’2” x 16’11” |
| Engine/Drivetrain | |
|---|---|
| Transmission | Full-automatic, planetary type Forward: Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gears Reverse: Torque converter drive and direct (lockup) |
| Engine Make | Komatsu |
| Engine Model | SAA12V140E-7 |
| Engine Type | Water-cooled, four-cycle |
| Cylinders | Effective cylinder stroke: --Front Suspension: 1’.06” --Rear Suspension: 5” |
| Horsepower | Gross: 1,200 HP Net: 1,140 HP |
| Bore x Stroke | 5.51”x6.50” |
| Torque | 3739 ft. lbs. |
| Air Cleaner | Dry type with double elements, precleaner and evacuator valve |
| Fuel Tank Capacity | 349.2 US Gallons |
| Speed | 40.4 MPH (Travel) |
| Governor | Electronically controlled |
| Rated RPM | 1900 RPM |
| Lubrication System | Method: Gear pump, force-lubrication Filter: Full-flow type |
| Number of Cylinders | 12 |
| Aspiration | Turbo-charged, after-cooled, cooled EGR |
| Fuel System | Direct injection |
| Piston Displacement | 1860 in³ |
| Fan Drive Type | Hydraulic |
| Final Drive | Planetary gear |
| Speed Range | Seven speeds forward and two reverse |
| Torque Converter | Three-elements, one-stage, two-phase |
| Operational | |
|---|---|
| Dump Height | 33’1” |
| Brakes | Brakes meet ISO 3450 standards Front & Rear Service Brake: Fully hydraulic control, oil-cooled multiple-disc type Parking Brake: Spring applied, multiple-disc type Retarder: Oil-cooled, multiple-disc front and rear brakes act as retarder Secondary Brake: Manual pedal operation When hydraulic pressure drops below the rated level, parking brake is automatically actuated |
| Suspension | McPherson strut type front suspension and four-link type rear axle suspension with independent, hydropneumatic cylinders. Effective cylinder stroke: 1’0.6” (Front Suspension); 5” (Rear Suspension) |
| Tires | 27.00 R49 |
| Steering | Fully hydraulic power steering with two double-acting cylinders Supplementary: Automatic/Manual control (meets ISO 5010 and SAE J1511) |
| Rear Axle | Full-floating |
| Heating System | Exhaust heating |
| Payload Capacity | 101.6 Tons |
| Hoist | Cylinder: Twin, two-stage telescopic type Time: 11.5 seconds |
| Relief Pressure Setting | 2990 PSI |
| Hydraulic System Capacity | 101.7 US Gallons |
| Oscillation | Rear Axle Oil Stopper: 5.3 ° Rear Axle Mechanical Stopper: 6.0° |
| Shift Control | Electronic shift control with automatic clutch modulation in all gears |
| Lockup Clutch | Wet, multiple-disc clutch |
ENGINE AND RELATED COMPONENTS
ELECTRICAL SYSTEM
POWER TRAIN AND CONTROLS
OPERATOR ENVIRONMENT
GUARD AND COVER GROUP
OTHER STANDARD EQIUPMENT
OTHER
BODY
TIRES
*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.
