Category : Off-Highway Trucks ➔ Manufacturer : Komatsu ➔ Model : HD785-7 ➔
Komatsu HD785-7 is a rigid-frame off-highway haul truck used in mining, quarrying, and large earthmoving operations. It is designed for high-volume material transport on haul roads and in loading cycles with excavators and wheel loaders. The HD785-7 is commonly configured with a large-capacity dump body, diesel engine, automatic transmission, and heavy-duty suspension for rough terrain. Typical applications include overburden removal, ore hauling, and aggregate transport. The model is part of Komatsu's HD series of off-highway trucks and is recognized for its payload-oriented design, service access, and compatibility with demanding production environments in surface mining and construction.
General Specifications
Komatsu HD785-7 Off-Highway Truck General Specifications specifications
Articulated/Rigid
Rigid - Starting 2016
Drive Configuration
RWD - Starting 2016
Drive System Mech/Electr.
M - Starting 2016
Engine Type
Komatsu SAA12V140E-3 - Starting 2016
Mfg. Model
HD785-7 - Starting 2018
Operating Weight
361,073.00 lbs (163,780.16 kg) - Starting 2018
Rated Payload
100.10 t (100,100.00 kg) - Starting 2018
Axles
Komatsu HD785-7 Off-Highway Truck Axles specifications
Differential
3.357
Final Drive
Planetary gear
Planetary
6.333
Rear
Full-floating
Body
Komatsu HD785-7 Off-Highway Truck Body specifications
Capacity Struck
40 cu yd
Dumping Angle
48 degrees
Heaped (2:1, Sae)
60 cu yd
Heating
Heating by exhaust gas
Height At Full Dump
33.10 ft (10.09 m)
Material
400 Brinell hardness high tensile strength steel
Material Thickness-Bottom
0.80 in (2.03 cm)
Material Thickness-Front
0.50 in (1.27 cm)
Material Thickness-Sides
0.40 in (1.02 cm)
Payload
91.7 metric tons
Structure
V-shape body with V-bottom
Target Area
7070 mm x 5150 mm
Brakes
Komatsu HD785-7 Off-Highway Truck Brakes specifications
Brake Surface
Front- 37467 cm2 ; Rear-37467 cm2
Parking Brake
Spring applied, multiple-disc type(actuates on all wheels)
Retarder
Oil-cooled, multiple-disc front and rear brakes act as retarder.
Secondary Brake
Pedal operation When hydraulic pressure drops below the rated level, parking brake is automatically actuated
Service Brake
Front- Fully hydraulic control, oil-cooled multiple-disc type; Rear- Fully hydraulic control, oil-cooled multiple-disc type
Capacities
Komatsu HD785-7 Off-Highway Truck Capacities specifications
Break Control
36.00 gal (136.26 l)
Differentials
137.00 gal (518.55 l)
Engine Oil
129.00 gal (488.27 l)
Final Drive
128.00 gal (484.48 l)
Fuel Tank
1,308.00 gal (4,950.78 l)
Hydraulic System
175.00 gal (662.38 l)
Suspension
93.00 gal (352.01 l)
Torque Converter, Transmission And Retarder Cooling
205.00 gal (775.93 l)
Dimensions
Komatsu HD785-7 Off-Highway Truck Dimensions specifications
Overall Height
16.57 ft (5.05 m)
Overall Length
36.14 ft (11.02 m)
Turning Radius
33.14 ft (10.10 m)
Wheelbase
16.25 ft (4.95 m)
Width Over Tires
17.07 ft (5.20 m)
Engine
Komatsu HD785-7 Off-Highway Truck Engine specifications
Air Cleaner
Dry type with double elements and precleaners, with dust indicator
Aspiration
Turbo-charged, after-cooled
Bore And Stroke
140 mm x 165 mm
Displacement
1,860.10 cu in (30,481.65 cu cm)
Engine Make
2238
Engine Model
SAA12V140E-3
Engine Type
Water-cooled, 4-cycle
Fan Drive Type
Mechanical
Fuel System
Direct injection
Governor
Electronic control
Horse Power: Iso 9249 / Sae J1349
1,178.00 hp (878.45 kw)
Horse Power: Sae J1995
1,200.00 hp (894.85 kw)
Lubrication System
Method- Gear pump, force-lubrication ; Filter-Full-flow type
Max Torque
5080N. m 518 kg. m
Number Of Cylinders
12
Power Measured @
1900 rpm
Hydraulic System
Komatsu HD785-7 Off-Highway Truck Hydraulic System specifications
Hoist Cylinder
Twin, 2-stage telescopic type
Hoist Time
Raise-13 s; Lower-14 s
Relief Pressure
20.6 MPa 210 kg/cm2
Tires
Komatsu HD785-7 Off-Highway Truck Tires specifications
Standard Tire
27.00 R49
Transmission
Komatsu HD785-7 Off-Highway Truck Transmission specifications
Forward
Torque converter drive in 1st gear, direct drive in 1st lockup and all higher gears
Lockup Clutch
Wet, multiple-disc clutch
Max Speed
40.40 mph (65.02 kph)
Reverse
Torque converter drivee, direct drive (lockup)
Shift Control
Electronic shift control with automatic clutch modulation in all gears
Speed Range
7 speeds forward and 2 reverse
Torque Converter
3-elements, 1-stage, 2-phase
Transmission
Full-automatic, planetary type
Weights
Komatsu HD785-7 Off-Highway Truck Weights specifications
Empty Weight
158,732.90 lbs (72,000.12 kg)
Gross Weight
361,073.10 lbs (163,780.21 kg)
Weight Distribution Front - Empty
47 %
Weight Distribution Front - Loaded
31.4 %
Weight Distribution Rear - Empty
53 %
Weight Distribution Rear - Loaded
68.6 %
