Komatsu HD785-7

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If you are looking for a truck that perfectly matches power, speed and reliability, the 100 ton capacity HD785-7 is the truck for you. Your operator can max his production by using his two working modes, tight turning radius, hydropneumatic suspension, skip shift function and oil multi-disc brakes and retarder. And he’ll do it in comfort in an ergonomic cab that rides on viscous dampers that reduce vibration and sound. Downshift, over-run and reverse inhibitors protect the truck and give the operator peace of mind.


Model   Komatsu SAA12V140E-3
Type   Water-cooled, 4-cycle
Aspiration   Turbo-charged, after-cooled
Number of cylinders   12
Bore x Stroke 5.51" x 6.50" 140 mm x 165 mm
Piston displacement 1,860 in³ 30.48 ltr
SAE J1995 Gross 1,200 HP Gross 895 kW
ISO 9249 / SAE J1349 Net 1,178 HP Net 879 kW
Rated rpm   1,900 rpm
Fan drive type.   Mechanical
Maximum torque 3,747 lb ft 518 kg•m
Fuel system   Direct injection
Governor   Electronic control
Lubrication system    
Method   Gear pump, force-lubrication
Filter   Full-flow type
Air cleaner   Dry type with double elements and pre-cleaned, with dust indicator
Torque converter   3-elements, 1-stage, 2-phase
Transmission   Full-automatic, planetary-shaft type
Speed range   7 speeds forward and 2 reverse (RH, RL)
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, direct drive (lockup)
Shift control   Electronic shift control with automatic clutch modulation in all gear
Maximum travel speed 40.4 mph 65 km/h
Rear axles Full-floating  
Final drive type Planetary gear  
Differential 3.357  
Planetary 6.333  
Suspension System    
Independent, hydropneumatic suspension cylinder with fixed throttle to dampen vibration.     
Effective cylinder stroke:    
Front suspension 12.6" 320 mm
Rear suspension 5.0" 127 mm
Rear axle oscillation    
Steering System    
Type   Fully hydraulic power steering with two double-acting cylinders
Supplementary steering   Electro-hydraulic motor
Minimum turning radius 33'2" 10.1 m
Maximum steering angle   41°
Integral four-post ROPS/FOPS Level 2 cab structure    
Main Frame    
Type   Box-sectioned structure Integral front bumper
Brakes meet ISO 3450 standard.    
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(actuates on all wheels)
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 5,807 in² 37467 cm²
Rear 11,224 in² 72414 cm²
Struck 52.3 yd³ 40 m³
Heaped (2:1, SAE) 78.5 yd³ 60 m³
Payload 100.3 U.S. tons 91.0 metric tons
Material   400 Brinell hardness high tensile strength steel
Structure   V-shape body with V-bottom
Material thickness:    
Bottom 0.75" 19 mm
Front 0.47" 12 mm
Sides 0.35" 9 mm
Target area (inside length x width) 23'2"x 17'1" 7065 mm x 5200 mm
Dumping angle   48°
Height at full dump 33'1" 10080 mm
Heating   Exhaust heating
Hydraulic System    
Hoist cylinder   Twin, 2-stage telescopic type
Relief pressure 2,990 psi 20.6 MPa / 210 kg/cm²
Hoist time    
Raise   13 sec
Lower   14 sec
Weight (approximate)    
Empty weight 158,800 lb 72000 kg
Max. gross vehicle weight 366,000 lb 166000 kg
Not to exceed max. gross vehicle weight, including options, fuel and payload.    
Weight distribution (Empty):    
Front axle   47%
Rear axle   53.00%
Weight distribution (Loaded):    
Front axle   31.50%
Rear axle   69%
Standard tire 27.00 R49  
Service Refill Capacities    
Fuel tank 345.6 U.S. Gal 1308 ltr.
Engine oil 34.1 U.S. Gal 129 ltr.
Torque converter, transmission and retarder cooling 54.2 U.S. Gal 205 ltr.
Differentials 36.2 U.S. Gal 137 ltr.
Final drives (total) 33.8 U.S. Gal 128 ltr.
Hydraulic system 46.2 U.S. Gal 175 ltr.
Brake control 9.5 U.S. Gal 36 ltr.
Suspension (total) 24.6 U.S. Gal 93 ltr.
Engine coolant 74.8 U.S. Gal 283 ltr