HD255-5 Komatsu HD255-5 Specifications & Technical Data (2012—2019)

Powerful KOMATSU SAA6D125E-3 Engine

This engine delivers quicker acceleration and higher travel speed with the highest output per weight. Advanced technology, such as Common-Rail Fuel Injection system, air-to-air aftercooler, and cooled EGR, enables the engine to meet the North American EPA Tier 2 emission regulations. Under low speed, improved acceleration and low fuel consumption ensures maximum productivity.

6-Speed, Fully Automatic K-ATOMiCS Transmission with Shift-Limiter Function

The K-ATOMiCS (Komatsu Advanced Transmission with Optimum Modulation Control System) automatically selects optimum gear according to vehicle speed, engine speed and shift position you've chosen. A shift-limiter function is equipped as a standard. It enables to maintain 1st gear when the vehicle descends a steep grade.

Sealed DT Connectors

Main harnesses and controller connectors are equipped with sealed DT connectors providing high reliability, water resistance and dust resistance.

Desiccant Type Air Dryer

Desiccant type air dryer is available as an option. It enables to get rid of the moisture and oil content in the compressed air that are provided from the air compressor. Therefore, reliability and durability of the air circuit is improved spectacularly.

Travel Performance

To determine travel performance: Read from gross weight down to the percent of total resistance. From this weight-resistance point, read horizontally to the curve with the highest obtainable speed range, then down to maximum speed. Usable rim pull depends upon traction available and weight on drive wheels.

Outstandlingly Small Turning Radius

The A-frames employed to the front wheels give a large steering angle, and realizes the outstandingly small turning radius. It enables to position the truck at a desired place easily and quickly.

Automatic Supplementary Steering and Secondary Brakes

Automatic supplementary steering and secondary brakes are employed as a standard. If an abnormality occurs in the steering hydraulic circuits or engine stops suddenly, this supplementary steering system works automatically and enables to continue steering operation. Brakes: ISO 5010, SAE J1511, SAE J53 Brakes: ISO 3450, SAE J1473

Oil-Cooled Multiple-Disc Retarder and Exhaust Brake

The large capacity continuously oil-cooled wet multiple disc retarder and the exhaust brake are equipped as standard and enable safe and continuous faster downhill drive.

Front Brake Ratio Valve

The front brake ratio valve lowers the air pressure at the beginning of braking operations to limit the efficiency of the front brake to reduce heating and wear of the brake pad. If the brake pedal is depressed more than half, however, the air pressure isn’t lowered, so the front brake works as designed.

Komatsu Components

Komatsu manufactures engine, torque converter, transmission, hydraulic units, and electrical devices on this dump truck. Komatsu dump trucks are manufactured with an integrated production system under a strict quality control system.

Flat Face-to-Face O-Ring Seals

Flat face-to-face O-ring seals are used to securely seal hydraulic hose and fuel line hose connections and to prevent oil or fuel leakage.

High Strength Quarry Body for Easy Loading Operation

The robust body is constructed of thick wear-resistant steel having 500 Brinell hardness. The V-shape, flat-bottom design also increases structural strength, and provides excellent load stability.

High Strength Body

The side plates of the body are reinforced with cross ribs to increase rigidity. The ribs of the body plate also increase the rigidity of the body. The entire body is made of low steel which were developed in cooperation with a Japanese steel manufacturer to meet the demanding technological requirements of this truck. This ultra hard wear-resisting steel has hardness 25% higher than the conventional steel and about 2.5 times higher than the common timing steel.

High-Rigidity Frames

Cast-steel components are used in the main frame for high-stress areas where loads and shocks are most concentrated. It provides a superior reliability and durability.

Wide, Specious Cab with Excellent Visibility

The cab is integrated with ROPS and the structures conform to ISO 3471 and SAE J1040 standards. The driver's compartment makes it very easy and comfortable for the operator to use all the controls. The wide windshield and large rearview mirrors provide the superior visibility and safety operation.

Suspension Seat

The suspension, fabric-covered seat which is adjustable to the operator's weight is provided as standard. The suspension seat dampens vibrations transmitted from the machine and reduces operator fatigue as well as holding the operator securely to assure confident operation.

Automatic Greasing System

This releases operators and mechanics from burdensome greasing work on the undercarriage. Maintenance time is shortened, and productivity is enhanced.