Introducing the HD785-8 Mechanical Haul Truck, a powerhouse designed for mining, quarry, and aggregate applications with a formidable rated payload of 101.6 U.S. tons. Equipped with the robust Komatsu SAA12V140E-7 engine boasting 1,140 net horsepower, this truck ensures excellent speed-on-grade performance. Notable features include a 78.5 yd³ V-shape dump body, a tight 33’2″ turning radius facilitated by MacPherson-strut-type independent suspension, and wet disc brakes on all four wheels delivering an impressive 1,770 HP of retarder-absorption capacity when descending grades.
Key Specifications:
- 101.6 U.S. ton-rated payload with a 78.5 yd³ V-shape dump body.
- 33’2″ turning radius due to the MacPherson-strut-type independent suspension.
- Wet disc brakes on all four wheels providing 1,770 HP of retarder-absorption capacity for effective grade descent control.
Product Features and benefits:
- Auto Idle Shutdown:
- Controls unnecessary fuel consumption by automatically stopping the engine and applying the parking brake after a set idling time (adjustable from five to 60 minutes).
- Selectable Operating Modes:
- Operators can choose between Economy mode for fuel savings or Power mode for enhanced performance.
- Variable Horsepower Control:
- Automatically detects whether the machine is loaded or unloaded, selecting the optimal horsepower setting for high production with low fuel consumption.
- Turning Radius:
- MacPherson-strut-type independent front suspension with A-arm design for wider spacing and easy engine bay access.
- Tight turning radius of 33′ 2″ for maneuverability and reduced material spillage.
- Wet Multiple-Disc Brakes and Retarder:
- Fully hydraulic-controlled wet multiple-disc brakes on all four wheels for reliable and stable brake performance.
- Large-capacity, continuously-oil-cooled, multiple-disc brakes function as a responsive retarder for downhill speed control.
- K-ATOMiCS Transmission:
- Komatsu Advanced Transmission with Optimum Modulation Control System to reduce fuel consumption, material spillage, and provide a smoother ride by automatically selecting gear positions.
- Automatic Retard Speed Control (ARSC):
- Allows the operator to set the desired downhill travel speed, with the system automatically applying the brake retarder to maintain the setting.
- Komatsu Traction Control System (KTCS):
- Monitors rear wheels for slippage and automatically applies brakes independently for enhanced traction without compromising steering performance.
- All-Around Monitoring (KomVision):
- Provides a 360-degree view of the surrounding work area on a dedicated monitor via a six-camera system.
- Integrated Payload Meter (PLM):
- Manages payload for each hauling cycle, analyzing production volume and working conditions to enhance productivity.
- Ground-Level Service Center:
- Located at the bottom of the hydraulic tank for quick preventative maintenance and servicing.
- Accessible ports for engine oil, transmission and brake cooling oil, brake control oil, and hydraulic oil.
- Zero-Harm Features:
- Lockable battery and starter isolators accessible from ground level.
- Machine immobilization switch for safety during maintenance.
- Emergency engine stop switch for shutting down the engine from ground level.
Product Specifications for HD785-8:
Engine:
- Model: Komatsu SAA12V140E-7
- Type: Water-cooled, four-cycle
- Aspiration: Turbo-charged, after-cooled, cooled EGR
- Number of Cylinders: 12
- Bore x Stroke: 5.51 x 6.50 in
- Piston Displacement: 1,860 in³
- Horsepower:
- SAE J1995 – Gross: 1,200 HP
- ISO 9249 / SAE J1349 – Net: 1,178 HP
- Rated RPM: 1,900 rpm
- Fan Drive Type: Mechanical
- Maximum Torque: 3,739 ft.-lbs.
- Fuel System: Direct injection
- Governor: Electronically controlled
- Lubrication System:
- Method: Gear pump, force-lubrication
- Filter: Full-flow type
- Air Cleaner: Dry type with double elements, precleaner, and evacuator valve
- EPA: Tier 4 Final emissions certified
Transmission:
- Torque Converter: Three-elements, one-stage, two-phase
- Transmission: Full-automatic, planetary type
- Speed Range: Seven speeds forward and two reverse
- Lockup Clutch: Wet, multiple-disc clutch
- Forward: Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gears
- Reverse: Torque converter drive and direct (lockup)
- Shift Control: Electronic shift control with automatic clutch modulation in all gears
- Maximum Travel Speed: 40.4 mph
Axles:
- Rear Axles: Full-floating
- Final Drive Type: Planetary gear
- Ratios:
- Differential: 2.944
- Planetary: 7.235
Suspension System:
- McPherson strut type front suspension and four-link type rear axle suspension with independent, hydropneumatic cylinders.
- Effective Cylinder Stroke:
- Front Suspension: 1 ft. 0.6 in
- Rear Suspension: 5 in
- Rear Axle Oscillation:
- Oil Stopper: 5.3°
- Mechanical Stopper: 6.0°
Steering System:
- Type: Fully hydraulic power steering with two double-acting cylinders
- Secondary Steering: Automatic/Manual control (Meets ISO 5010 and SAE J1511)
- Minimum Turning Radius: 33 ft. 2 in
- Maximum Steering Angle: 41°
Cab:
- Standard:
- FOPS (ISO 3449 level II), ROPS (ISO 3471)
Brakes:
- Brakes meet ISO 3450 standards.
- Service Brakes:
- Front: Fully hydraulic control, oil-cooled multiple-disc type
- Rear: 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 a retarder
- Secondary Brake: Manual pedal operation when hydraulic pressure drops below the rated level, parking brake is automatically actuated
- Brake Surface:
- Front: 6,075 in²
- Rear: 11,138 in²
Main Frame:
- Type: Box-sectioned structure
Body:
- Capacity:
- Struck: 52.3 yd³
- Heaped (2:1, SAE): 78.5 yd³
- Payload: 101.6 US tons
- Material: 400 brinell hardness high tensile strength steel
- Structure: V-shape body with V-bottom
- Material Thickness:
- Bottom: 0.75 in
- Front: 0.47 in
- Sides: 0.35 in
- Target Area (Inside Length x Width): 23 ft. 2 in x 16 ft. 11 in
- Height at Full Dump: 33 ft. 1 in
- Heating: Exhaust heating
Hydraulic System:
- Hoist Cylinder: Twin, two-stage telescopic type
- Relief Pressure: 2,990 psi
- Hoist Time: 11.5 s
Weight (Approximate):
- Rated Empty Vehicle Weight: 162,701 lbs.
- Rated Gross Vehicle Weight: 365,967 lbs.
- Weight Distribution (Empty):
- Front Axle: 51.5%
- Rear Axle: 48.5%
- Weight Distribution (Loaded):
- Front Axle: 33.2%
- Rear Axle: 66.8%
Tires:
- Standard Tire: 27.00 R49
Service Refill Capacities:
- Fuel Tank: 349.2 US gal
- Engine Oil: 36.5 US gal
- Torque Converter, Transmission and Retarder Cooling: 140.0 US gal
- Differentials: 59.6 US gal
- Final Drives (Total): 30.6 US gal
- Hydraulic System: 101.7 US gal
- Suspension (Total): 24.5 US gal
Further information on this machine can be viewed by visiting this link https://www.komatsu.com/products/trucks/mechanical-trucks/hd785-8
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