The system allows selection of the appropriate mode between <Power mode > or <Economy mode> according to each working condition. The mode is easily selected with a switch in the operator’s cab.
Great productivity can be attained by taking full advantage of high output power. It is appropriate for job sites where larger production uphill-hauling is required.
The engine power automatically changes depending on loaded or unloaded conditions always to use an optimum gear speed. It is appropriate for light work on flat ground.
This system facilitates quick engine warm-up and cab cooling/warming. When setting the system ON, engine idle speed is kept at 945 rpm when coolant temperature is 50°C 122°F or lower. Speed automatically returns to 725 rpm when coolant temperature reaches 50°C 122°F.
The K-ATOMiCS (Komatsu Advanced Transmission with Optimum Modulation Control System) automatically selects the optimum gear according to vehicle speed, engine speed and the shift position you’ve chosen. This results in the best gear for any driving situation.
Wet multiple-disc brakes ensure highly reliable and stable brake performance. The large-capacity, continuously cooled, wet multiple-disc brakes also function as a highly responsive retarder which gives the operator greater confidence at higher speeds when travelling downhill.
• Retarder Absorbing Capacity (continuous descent): 785 kW 1,052 HP
• Brake Surface Area (rear): 64230 cm² 9,956 in²
The MacPherson strut type front suspension has a special A-frame 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 this turning angle, the smaller the turning radius of the truck.
The 5-way adjustable operator seat and the tilt-telescopic steering column create an optimum driving posture for increased driving comfort and more control over the machine’s operations. The suspension seat dampens vibrations transmitted from the machine, which reduces operator fatigue and holds the operator securely to assure confident operation. 78 mm 3" width seat belt is provided as standard equipment.
The hydropneumatic suspension assures a comfortable ride even over rough terrain and ensures maximum productivity and operator confidence.
An electronically controlled valve is provided for each clutch pack in the transmission for independent clutch engagement/disengagement. It enables an ideal change in clutch modulation pressure and torque cut-off timing in response to travel conditions. This system and newly added “skip-shift” function ensure smooth shifting and responsive acceleration.
Optimum travel speed automatically selected in response to angle of ascent. This reduces the Downshift frequency and provides smoother operation.
Viscous mounts reduce the noise transmitted to the cab and achieve a quiet 77 dB(A) noise level.
Cast-steel components are used in the box section main frame for highstress areas where loads and shocks are most concentrated.
The Komatsu advanced monitoring system identifies maintenance items, reduces diagnostic times, indicates oil and filter replacement hours and displays abnormality codes. This monitor system helps to maximize machine production time.
Wet multi-disc brakes and fully hydraulic braking systemsmean lower maintenance costs and higher reliability. Wet disc brakes are fully sealed to keep contaminants out, reducing wear and maintenance. Brakes require no adjustments for wear, resulting in even lower maintenance. Added reliability is designed in the braking system with three independent hydraulic circuits providing hydraulic backup should one of the circuits fail. Fully hydraulic braking systems eliminate the air system so air bleeding is not required and water condensation, that can lead to contamination, corrosion and freezing, is also eliminated.