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

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Overview
Specifications
Service and support
Technology
Gallery

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

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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.

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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.

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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.

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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.

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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.

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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.

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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

Full specifications

Standard equipment

Optional equipment

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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)
Cold weather package (electric heaters for engine oil & coolant heater)
Dump counter
Ecology guidance and ecology gauge
Engine oil & coolant heater, electric
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)

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)
Cold weather package (electric heaters for engine oil & coolant heater)
Dump counter
Ecology guidance and ecology gauge
Engine oil & coolant heater, electric
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)

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)

OTHERS

Power boarding ladder

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)

OTHERS

Power boarding ladder

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