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Komatsu America’s HD785-7 Off-Highway Dump Truck

Komatsu’s HD785-7 off-highway truck provides a maximum net output of 1,178 hp (878 kW).  The engine meets EPA Tier II emission regulations.

Komatsu’s HD785-7 off-highway truck provides a maximum net output of 1,178 hp (878 kW). The engine meets EPA Tier II emission regulations.

Komatsu America Corp.’s HD785-7 off-highway truck features a powerful, clean burning Komatsu SAA12V140E-3 turbocharged, after-cooled engine that provides a maximum net output of 1,178 hp (878 kW). The engine meets EPA Tier II emission regulations.

Special features of the HD785-7 include:

• High Performance for Enhanced Productivity

The HD785-7’s engine performance delivers acceleration and travel speeds with high horsepower per ton, high torque at low speed, impressive acceleration, low fuel consumption and increased productivity.

The variable horsepower control (VHPC) system selects the appropriate mode (either power or economy) based on the working condition. The VHPC system detects the truck’s load and selects the optimum horsepower setting, providing high production and low fuel consumption. The fully automatic transmission selects an optimum gear according to the travel and engine speed. The shifting point is automatically selected depending on the machine’s acceleration to reduce fuel consumption.

The automatic retard speed control system (ARSC) allows operators to set downhill travel speed at a constant level. The brake cooling oil temperature is constantly monitored so the speed is automatically reduced if the oil temperature rises.

The Komatsu designed electronically controlled all clutch modulation system with K-ATOMiCS optimizes the clutch engagement oil pressure at every gear for smoother shifting with minimal torque shock.


The HD785-7 features an extra-long wheelbase, a wide tread and an exceptionally low center of gravity for greater productivity and superior driving over rough terrain.

• Enhanced Cab Design for Optimal Operator Comfort and Safety

The HD785-7 is equipped with an ergonomically designed cab that provides a quieter and more comfortable operator environment. The spacious cab is mounted with Komatsu’s viscous mounts to keep noise at a minimum and provide a low-vibration operating environment. A low effort body dump control level makes dumping loads significantly easier. Pedal-operated secondary brakes activate the 4-axle parking brakes. When hydraulic pressure drops below the rated level, the parking brake is automatically activated. The five-way adjustable operator seat and the tilt-telescopic steering column provide an optimum driving posture for increased driving comfort and better control over the machine’s operation.

• Durability and Reliability Provide Easy Maintenance

Flat face-to-face O-ring seals are used to securely seal all hydraulic hose connections to prevent oil leakage. The main harnesses and controller connectors are equipped with sealed DT connectors that provide high reliability as well as dust and water resistance.

The fully hydraulic controlled wet multiple-disc brakes ensure reliable and stable brake performance. Wet disc brakes are fully sealed to keep contaminants out, reducing wear and maintenance.

Both the filters and greasing points are centralized for easier servicing. To minimize operating costs, oil change intervals are extended to 500 hours for engine oil and 4,000 hours for hydraulic oil.

The following new standard features have been added this year:

• AM/FM radio with auxiliary port

• 3 point driver’s seat belt

• Dimpled walkways for increased traction

• Color rearview monitor

The HD785-7 also is equipped with the KOMTRAX Plus (former VHMS) technology, which sends machine operating information to a secure Web site utilizing wireless technology. Data such as operating hours, component trends, machine utilization (including idle time and fuel consumption) and production information are relayed to the web application and made available on-line for analysis. The KOMTRAX Plus fleet monitoring system monitors machine availability, allows for remote diagnosis of machine issues, and provides a wealth of other information to use to drive business efficiency.

For more information, visit www.komatsuamerica.com.