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Mechanical haul truck

HD785-8

  • Gross horsepower 895 kW @ 1 900 rpm 1,200 HP @ 1,900 rpm
  • Operating weight 166 000 kg 365,967 lbs.
  • Capacity 92.2 mt 101.6 st

Power on grade. Exceptional brake-retarding performance.

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.

  • 101.6 U.S. ton-rated payload / 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 deliver 1,770 HP of retarder-absorption capacity

Features and benefits

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.

Specifications for HD785-8

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US system Metric
Engine
Model Komatsu SAA12V140E-7*
Type Water-cooled, four-cycle
Aspiration Turbo-charged, after-cooled, cooled EGR
Number of cylinders 12
Bore x Stroke 140 x 165 mm
Piston displacement 30.48 L
Horsepower
    SAE J1995 - Gross 895 kW
    ISO 9249 / SAE J1349 - Net 879 kW
    Rated rpm 1 900 rpm
Fan drive type Mechanical
Maximum torque 517 kg-m
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

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 65 kph
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
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 320 mm
    Rear suspension 127 mm
Rear axle oscillation:  
    Oil stopper
5.3°
    Mechanical stopper
6.0°

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 10.1 m
Maximum steering angle 41°
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)

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 retarder
    Secondary brake Manual pedal operation when hydraulic pressure drops below the rated level, parking brake is automatically actuated
Brake surface:
    Front 39 195 cm²
    Rear 71 858 cm²

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 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
Type Box-sectioned structure
Body
Capacity:
    Struck 40 m³
    Heaped (2:1, SAE) 60 m³
Payload 92.2 metric tons
Material 400 brinell hardness high tensile strength steel
Structure V-shape body with V-bottom
Material thickness:
    Bottom 19 mm
    Front 12 mm
    Sides 9 mm
Target area (inside length x width) 7 070 x 5 150 mm
Height at full dump 10 080 mm
Heating Exhaust heating
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 20.6 MPa / 210 kg/cm²
Hoist time 11.5 s
Hoist cylinder Twin, two-stage telescopic type
Relief pressure 2,990 psi
Hoist time 11.5 s
Weight (approximate)
Rated empty vehicle weight 73 800 kg
Rated gross vehicle weight 166 000 kg
Weight distribution (Empty):
    Front axle 51.5%
    Rear axle 48.5%
Weight distribution (Loaded):
    Front axle 33.2%
    Rear axle 66.8%
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
Standard tire 27.00 R49
Service Refill Capacities
Fuel tank 1322 L
Engine oil 138 L
Torque converter, transmission and retarder cooling 530 L
Differentials 203 L
Final drives (total) 116 L
Hydraulic system 385 L
Suspension (total) 92.6 L
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

ENGINE AND RELATED COMPONENTS

  • Air cleaner, double element with restriction indicator (qty 2)
  • Auto Idle Shutdown
  • Automatic Idling Setting System (AISS)
  • Electric priming fuel pump
  • Engine, KOMATSU SAA12V140E-7, 12 cylinder, turbocharged, after cooled, EGR cooled, diesel
    Gross HP: 1200 HP / 1900 RPM (SAE J1995)
    Net HP: 1140 HP / 1900 RPM (ISO 9249 / SAE J1349)
  • Engine pre-lubrication system
  • Engine secondary shutdown switch
  • Fan, hydraulically driven, reversible
  • Komatsu diesel particulate filter (KDPF) (qty 2)
  • Radiator, lead free, modular core

ELECTRICAL SYSTEM

  • Alternator, 140 amp, 24 volt
  • Back-up alarm
  • Batteries, 4 x 12V
  • Battery isolator
  • Electric circuit breakers, 24V
  • Emergency stop switch, ground level
  • Horn, electric
  • Lights
  • Access ladder lamps
  • Back-up Lamps, rear
  • Engine compartment lamp
  • Fog lamps
  • Head lamps, high and low beam, LED
  • Side working lamps, LH & RH, LED
  • Stop and tail Lamps, LED
  • Turn signals, hazard warning, front & rear, LED
  • Starter isolator
  • Starting motors, 2 x 11.0 kW, electric

POWER TRAIN AND CONTROLS

  • 7-speed transmission, fully automatic, (7F, 2R)
  • Brake cooling oil recovery tank
  • Brakes, oil cooled, multiple disc, hydraulically controlled, front & rear
  • Komatsu Traction Control System (KTCS)
  • Neutral coast inhibitor
  • Parking brake, integrated in front & rear brakes
  • Retarder, automatic & manual
  • Secondary brake, pedal actuated, variable
  • Skip shift function
  • Speed limiter
  • Torque converter with electronic lockup control

OPERATOR ENVIRONMENT

  • Cab with built-in ROPS/FOPS (ISO 3471/ISO 3449)
  • 12V outlet (qty 2)
  • Automatic climate control system with cab pressurization
  • Body hoist control, electric
  • Cigarette lighter and ashtray
  • Cup holder
  • Door, LH & RH
  • KomVision camera system with dedicated monitor
  • Machine monitor with 7" color LCD display
  • Mode selection system with Variable Horsepower Control (VHPC)
  • Operator seat, air suspension, heated, ventilated with 3-point 3" retractable seat belt
  • Power windows, LH & RH
  • Radio, AM/FM with aux input, USB, & bluetooth
  • Rearview mirror, outside cab mount, heated (qty 2)
  • Rearview monitoring system with dedicated monitor
  • Secondary steering, automatic & manual
  • Steering wheel, tilt and telescopic
  • Sunvisor (qty 2)
  • Tinted glass with electric defogger
  • Trainer seat with 3" retractable lap belt
  • Underview mirror
  • Wiper/washer, windshield (intermittent)
  • Diagonal access stairway

GUARD AND COVER GROUP

  • Cab & platform guard
  • Catwalk with handrails, skid resistant
  • Driveline guards, front & rear
  • Engine side covers
  • Engine underguard
  • Exhaust thermal guard
  • Fire safety shield (located behind engine)
  • Mud flaps
  • Rock ejector bars
  • Transmission underguard

OTHER STANDARD EQIUPMENT

  • Anchor points, tie off type (ISO 14567)
  • Automatic Retard Speed Control (ARSC)
  • Dump counter
  • Ecology guidance and ecology gauge
  • Fast fill coupler for fuel tank
  • Filler cap lock & cover lock
  • Ground level service center
    -Centralized KOWA sampling
    -Fluids ports
    Transmission, engine, brake control, steering and hoist oil
  • Hydropneumatic Suspension, Front & Rear
  • Jump start receptacle
  • KOMTRAX Plus®
  • Machine immobilization switch
  • Overload prevention system
  • Overrun warning and prevention
  • Overturn warning system
  • Payload meter
  • PM service connectors
  • Rims for 27.00 R49 tires with large bore valve stems (qty 6)
  • Safety pins (qty 2)
  • Wheel chocks (qty 2)

OTHER

  • Cold weather package (electric heaters for engine oil & coolant heater)

ENGINE AND RELATED COMPONENTS

  • Air cleaner, double element with restriction indicator (qty 2)
  • Auto Idle Shutdown
  • Automatic Idling Setting System (AISS)
  • Electric priming fuel pump
  • Engine, KOMATSU SAA12V140E-7, 12 cylinder, turbocharged, after cooled, EGR cooled, diesel
    Gross HP: 895 kW / 1900 RPM (SAE J1995)
    Net HP: 849 kW / 1900 RPM (ISO 9249 / SAE J1349)
  • Engine pre-lubrication system
  • Engine secondary shutdown switch
  • Fan, hydraulically driven, reversible
  • Komatsu diesel particulate filter (KDPF) (qty 2)
  • Radiator, lead free, modular core

ELECTRICAL SYSTEM

  • Alternator, 140 amp, 24 volt
  • Back-up alarm
  • Batteries, 4 x 12V
  • Battery isolator
  • Electric circuit breakers, 24V
  • Emergency stop switch, ground level
  • Horn, electric
  • Lights
  • Access ladder lamps
  • Back-up Lamps, rear
  • Engine compartment lamp
  • Fog lamps
  • Head lamps, high and low beam, LED
  • Side working lamps, LH & RH, LED
  • Stop and tail Lamps, LED
  • Turn signals, hazard warning, front & rear, LED
  • Starter isolator
  • Starting motors, 2 x 11.0 kW, electric

POWER TRAIN AND CONTROLS

  • 7-speed transmission, fully automatic, (7F, 2R)
  • Brake cooling oil recovery tank
  • Brakes, oil cooled, multiple disc, hydraulically controlled, front & rear
  • Komatsu Traction Control System (KTCS)
  • Neutral coast inhibitor
  • Parking brake, integrated in front & rear brakes
  • Retarder, automatic & manual
  • Secondary brake, pedal actuated, variable
  • Skip shift function
  • Speed limiter
  • Torque converter with electronic lockup control

OPERATOR ENVIRONMENT

  • Cab with built-in ROPS/FOPS (ISO 3471/ISO 3449)
  • 12V outlet (qty 2)
  • Automatic climate control system with cab pressurization
  • Body hoist control, electric
  • Cigarette lighter and ashtray
  • Cup holder
  • Door, LH & RH
  • KomVision camera system with dedicated monitor
  • Machine monitor with 7" color LCD display
  • Mode selection system with Variable Horsepower Control (VHPC)
  • Operator seat, air suspension, heated, ventilated with 3-point 3" retractable seat belt
  • Power windows, LH & RH
  • Radio, AM/FM with aux input, USB, & bluetooth
  • Rearview mirror, outside cab mount, heated (qty 2)
  • Rearview monitoring system with dedicated monitor
  • Secondary steering, automatic & manual
  • Steering wheel, tilt and telescopic
  • Sunvisor (qty 2)
  • Tinted glass with electric defogger
  • Trainer seat with 3" retractable lap belt
  • Underview mirror
  • Wiper/washer, windshield (intermittent)
  • Diagonal access stairway

GUARD AND COVER GROUP

  • Cab & platform guard
  • Catwalk with handrails, skid resistant
  • Driveline guards, front & rear
  • Engine side covers
  • Engine underguard
  • Exhaust thermal guard
  • Fire safety shield (located behind engine)
  • Mud flaps
  • Rock ejector bars
  • Transmission underguard

OTHER STANDARD EQIUPMENT

  • Anchor points, tie off type (ISO 14567)
  • Automatic Retard Speed Control (ARSC)
  • Dump counter
  • Ecology guidance and ecology gauge
  • Fast fill coupler for fuel tank
  • Filler cap lock & cover lock
  • Ground level service center
    -Centralized KOWA sampling
    -Fluids ports
    Transmission, engine, brake control, steering and hoist oil
  • Hydropneumatic Suspension, Front & Rear
  • Jump start receptacle
  • KOMTRAX Plus®
  • Machine immobilization switch
  • Overload prevention system
  • Overrun warning and prevention
  • Overturn warning system
  • Payload meter
  • PM service connectors
  • Rims for 27.00 R49 tires with large bore valve stems (qty 6)
  • Safety pins (qty 2)
  • Wheel chocks (qty 2)

OTHER

  • Cold weather package (electric heaters for engine oil & coolant heater)

BODY

  • Dump body, 78.5 yd3
  • Steel liners for rock body (78.5 yd3)
  • Body heating kit

TIRES

  • Michelin XDR2B (qty 6)
  • Bridgestone VMTP (qty 6) 

BODY

  • Dump body, 78.5 yd3
  • Steel liners for rock body (78.5 yd3)
  • Body heating kit

TIRES

  • Michelin XDR2B (qty 6)
  • Bridgestone VMTP (qty 6) 
Support you can count on

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Komtrax for construction equipment is Komatsu’s state of the art remote monitoring system, helping you keep track of where your machines are and how much they are working. The system seamlessly gathers important data that can help you coach operators to improve efficiencies and productivity.

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