Komatsu America boosts horsepower with new off-highway truck

Komatsu america

Komatsu America’s new HD785-8 boasts the highest in class net horsepower for off-highway haul trucks in North America.

The new haul truck is equipped with the Tier 4 Komatsu SAA12V140E-7 engine, which generates 1,140 hp.   

With a payload capacity of 92.2 tonnes, the new truck is designed for mining, quarry and aggregate applications.

“The HD785-8 has excellent travel performance on grade, and wet multiple disc brakes on all four wheels provide great downhill brake retarding performance,” said Robert Hussey, product marketing manager at Komatsu America.  

“The HD785-8 delivers fast acceleration out of the pit and the new cab keeps operators comfortable during long shifts, resulting in high production per hour.”

Tight turning radius

With a turning radius of 10.1 metres, the HD785-8 provides exceptional maneuverability when spotting to be loaded and positioning to dump. As well, the Komatsu Traction Control System (KTCS) is standard on the HD785-8.

KTCS automatically applies pressure to independent brake assemblies for optimum traction in various ground conditions, without the need for differential lock-up, so steering performance is not compromised.

KomVision all-around machine monitoring system provides the operator with a bird’s-eye view of the working area on a separate in-dash monitor.

The HD785-8 has a 7-speed, fully automatic transmission with two selectable reverse speeds. The Komatsu Advanced Transmission with Optimum Modulation Control System (K-ATOMiCS) ensures smooth clutch engagement for a comfortable ride and reduced material spillage.

The Automatic Retard Speed Control (ARSC) automatically maintains a selected downhill travel speed (rather than engine rpm) to let operators keep their focus on the haul road.

The Tier 4 Final after treatment s utilizes dual Komatsu Diesel Particulate Filters (KDPF), and most regeneration is performed passively, with no action required from the operator and no interference with machine operation. Without Selective Catalytic Reduction (SCR), Diesel Exhaust Fluid (DEF) is not a required consumable fluid.

In-cab enhancements

The truck is built with a new air-suspension, heated and ventilated operator seat and upgraded trainer seat. As well, KOMTRAX Plus telematics system and upgraded machine monitor provide key machine metrics for utilization, production and machine health.

Furthermore, the Auto Idle Setting System (AISS) adjusts engine idle speed based on coolant temperature for reduced machine warm-up time. Auto Idle Shutdown also helps reduce unnecessary idle time and lowers operating cost.

For easy access to the cab, the truck is built with a standard diagonal access stairway. Additional ladders with gates and handrails on the right-hand and left-hand side provide secondary egress.

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For maintenance, anchored tie off points around the machine provide technicians a location to attach service lanyards. Komatsu also designed the truck with centralized arrangement of filters, grease points and fast fuel fill coupler.

The battery isolator, starter isolator, machine immobilization switch, service centre and jump start receptacle are all located at ground level.