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.
“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.
The newly designed cab has been upgraded with several features to improve operator comfort, including a new weight-adjustable, heated and ventilated air suspension seat for long shifts. The truck also offers easy operator cab access with its standard diagonal angled stairway. Additional operator-friendly features include an automatic climate control system; tilt-away and telescoping steering column; two DC12V outlets; a radio with Bluetooth technology, AUX and USB; an electric hoist control; generous storage space; viscous cab mounts for a quiet, comfortable ride; and a rear hydropneumatics suspension for a smoother ride over rough terrain.
“We have an incredibly comfortable truck. It’s a world class truck. The operators love driving these things. It comes with a lot of standard features like anti-lock brakes, payload monitoring and KomVision,” Heddle says. “Komatsu took the attitude that there isn’t an ‘A truck’ and a ‘B truck.’ They all come with all the options on them. Operators want to have a truck with all the bells and whistles.”
“KomVision provides a bird’s-eye view from six cameras from dedicated in-dash displays,” says Komatsu America Corp. product specialist Sebastian Witkowski.
KomVision’s two screen mode allows for the bird’s-eye view and any of the six cameras to be viewed simultaneously on the monitor.
The HD785-8 haul truck also comes standard with a rear-view monitor system with a hi-res LCD display and a re-designed lighting system.
“We’ve got a new LED head lamp with hi-beams and low-beams, side lamps and rear-combination lamps,” Witkowski says.
“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.
“The monitor displays the live payload in the haul truck, and we can get additional data including tons per gallon, total payload, etc. The data is available in KOMTRAX, where there are summarized daily and monthly reports,” Witkowski says. “You can get deeper into productivity data. You can get cycle by cycle detailed data accessed via direct download from machine.”
Quick Specs on Komatsu's HD785-8
Tier 4 Final
1,140 HP @1,900 rpm (849 kW @1,900 rpm)
GROSS VEHICLE WEIGHT
365,967 lb (166,000 kg)
HEAPED BODY CAPACITY
78.5 yd3 (60 m3)
101.6 U.S. tons (92.2 metric tons)