The HD785-8 off-highway haul truck from Komatsu America Corp. has been built to ensure optimal comfort, productivity, and safety for heavy equipment operators.

The Tier 4 Final compliant rigid frame haul truck has a rated payload of 101.6 US tons for high production mining, quarrying, and aggregate applications. The truck’s oil cooled, multiple-disc brakes on all four wheels provide excellent retarding capability for downhill travel while the Komatsu SAA12V140E-7 engine outputs 1,140 net horsepower for high productivity on grade. 

Komatsu Traction Control (KTCS) comes standard on the HD785-8 and provides optimum traction in various ground conditions. 

The HD785-8 has the best-in-class tight turning radius at 10.1 m (33 ft. 2 in.) thanks to its McPherson strut type front suspension for excellent maneuverability when spotting or positioning to dump. The McPherson strut type front suspension has a special A-arm between each wheel and the main frame. The wider space created between the front wheels and the main frame increases the turning angle of the wheels. The larger turning angle provides a smaller turning radius for the truck.

The HD785-8 haul truck features a Komatsu SAA12V140E-7 Tier 4 Final engine with a net horsepower of 1,140hp (849 kw) @ 1,900 rpm.

“This high horsepower Tier IV engine has been the same engine for the last few generations. It’s a well proven Komatsu engine,” Heddle says.

In addition to offering reliability and durability, the HD785-8 offers operators and maintenance staff the advantage of not requiring diesel exhaust fluid (DEF) or selective catalytic reduction (SCR) technologies.

“We achieve Tier 4 final regulatory compliance with two DPF canisters on the machine,” Witkowski says.

“There are lots of inherent issues with DEF, and the fact that it freezes up in cold climates and then needing heating systems inside the machines,” Heddle adds. “When people think of Tier 4, they think of DEF, but it’s not on the HD785-8. It’s a very mature truck. Very sophisticated and reliable.”

The haul trucks also come standard with an auto idle shutdown feature to help reduce idle times and operating costs.

“It automatically shuts down the engine if the truck is left in an idle state. The threshold can be anywhere from five to 60 minutes,” Witkowski says.

Additional maintenance-friendly features include an advanced monitoring system with onboard diagnostics with no laptop required; anchored tie of points (ISO 14567) around the machine for providing technicians locations to attach service lanyards; fast fuel fill coupler; ground level battery isolator; starter isolator and machine immobilization switch with lockout/tagout capabilities; a jump start receptacle; a modular radiator core system; and KOMTRAX Plus for remote access to maintenance and performance information.