90t Dump Truck

Our 91-tonne capacity mechanical drive HD785-7 offers the highest brake retardation in its class


Rigid Dump Trucks For Hire
Equipment Class


Our 91-tonne capacity mechanical drive HD785-7 offers the highest brake retardation in its class, along with Komatsu’s advanced transmission system for greater safety in all types of mining applications. As with all our trucks, key components are designed and manufactured by Komatsu to work together in an integrated package. And it comes standard with our KOMTRAX PLUS remote monitoring and location system, backed by our Australia-wide service and support network.


Model Komatsu SAA12V140E-3
Type Four-cycle, water-cooled, direct injection
Aspiration Turbo-charged, after-cooled
Number of cylinders 12
Bore x stroke 140 mm x 165 mm
Displacement 30.48 ltr
Horsepower, Gross - SAE J1995 895 kW / 1200 HP
Horsepower, Net - ISO 9249 / SAE J1349 879 kW / 1178 HP
Rated RPM 1900
Fan drive method Mechanical
Emissions certification EPA Tier 2


Capacity, struck 40 m3
Capacity, heaped (2:1 SAE) 60 m3
Payload 91700 kg
Target area (inside length x width) 7070 mm x 5150 mm
Heating Exhaust heating
Material 400 Brinell hardness high tensile strength steel
Material thickness:
Bottom 19 mm
Front 12 mm
Sides 9 mm


Standard ISO3450
Service brake - front Full-hydraulic control, oil-cooled, multiple-disc type
Service brake - rear Full-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 Pedal operation. When hydraulic pressure drops below rated level, parking brake automatically actuated
Brake surface:  
Front 37467 cm2
Rear 72414 cm2
  • Cab


    ISO3471 (ROPS)

    ISO3449 (FOPS)

  • Hydraulic System

    Hoist cylinder Twin, two-stage telescopic type
    Relief pressure

    20.6 MPa

    210 kg/cm2

    Hoist time  
    Raise 13 sec
    Lower 14 sec
  • Main Frame

    Type Box-sectioned structure. Integral front bumper
  • Service Refill Capacities

    Fuel tank 1308 ltr
    Engine oil 129 ltr
    Torque converter, transmission and retarder cooling 205 ltr
    Differential 137 ltr
    Final drives (total) 128 ltr
    Hydraulic system 175 ltr
    Brake control 36 ltr
    Suspension (total) 93 ltr
  • Steering System

    Type Fully hydraulic power steering with two double-acting cylinders
    Supplementary steering Meets ISO5010, SAEJ1511
    Minimum turning radius 10.1 m
    Maximum steering angle 41°
  • Suspension System

    Independent , hydro-pneumatic suspension cylinder with fixed throttle to dampen vibration

    Effective cylinder stroke:  
    Front suspension 320 mm
    Rear suspension 127 mm
    Rear axle oscillation 6.5°


Torque converter 3-elements, 1-stage, 2-phase
Transmission Full-automatic, planetary-gear type
Speed range 7 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 gears
Maximum travel speed 65 km/h
  • Tyres

    Standard tyre 27.00 R49
  • Weight Distribution:

    Front axle 47%
    Rear axle 53%
    Front axle 31.4%
    Rear axle 68.6%

    Weight (Approximate)

    Empty and Gross Weight:

    Empty weight 72000 kg
    Gross vehicle weight 163780 kg


Rear axle Full-floating
Final drive type Planetary gear
Differential 3.357
Planetary 6.333

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