With an operating weight between 87,388 lb (39,638 kg) and 89,248 lb (40,579 kg), Komatsu America's PC390LC-11 hydraulic excavator has upgraded cab features and an enhanced power mode for greater productivity and lower cost per ton, according to the company.
In addition to improved productivity and upgraded cab features, the PC390LC-11 maintains the same lifting performance and stability of the previous model. The PC390LC-11 continues to feature PC450 class heavy-duty undercarriage components to maintain the same high lift capacity and lateral stability as its predecessor. The larger undercarriage has a 6% wider track gauge and offers up to 18% greater over-the-side lift capacity than the PC360LC-11.
The excavator is equipped with the latest KOMTRAX technology, Komatsu’s standard telematics system, which relays data such as fuel levels, diesel exhaust fluid (DEF) levels, operating hours, location, cautions, and maintenance alerts. A new Operator Identification System reports key operating information for multiple operators, and the new Auto Idle Shutdown function helps reduce idle time as well as operating costs.
With 257 hp (192 kW) net, the excavator is powered by a Komatsu Tier 4 Final SAA6D114E-6 engine. Komatsu’s Tier 4 Interim foundation integrates a selective catalyst reduction (SCR) system. The engine uses an electronic control system to manage the air-flow rate, fuel injection, combustion parameters, and aftertreatment functions to optimize performance, reduce emissions, and provide advanced diagnostic capability. The powertrain system continues to use Komatsu's variable geometry turbocharger (VGT) and an exhaust gas recirculation (EGR) valve for temperature and air management control.
Komatsu developed the entire system, including the control software that is critical to the effective operation of the aftertreatment system. Additionally, the control system is integrated into the machine’s onboard diagnostics systems and KOMTRAX.
All major components on the new PC390LC-11 including the engine, hydraulic pumps, motors, and valves are exclusively designed and produced by Komatsu. This integrated design uses an efficient closed center load-sensing hydraulic system and features a new enhanced power mode for improved performance and reduced cycle times.
The PC390LC-11's ISO 12117-2 ROPS certified cab, specifically designed for hydraulic excavators, gains strength from a reinforced box structure framework. The cab is mounted on viscous isolation dampers that provide low vibration levels.
A standard heated air suspension high-back seat with new fully adjustable armrests provides improved comfort. In addition to the standard AM/FM stereo radio, a remote located auxiliary input for connecting external devices is provided to play music through the cab speakers. Additionally there are two 12-volt power ports incorporated into the cab, and optional joysticks are available with proportional controls for attachment operation.
The high-resolution 7-in LCD color monitor features enhanced capabilities and displays information in 33 languages. The operator can easily select up to six working modes to match machine performance to the application. The monitor panel provides information on DEF fluid level, Eco guidance, operational records, fuel consumption history, and utilization information. A new display interface combines vehicle information with a wide landscape view from the standard rearview camera so the operator can easily view the working area directly behind the machine.
The PC390LC-11 has handrails on both sides of the upper structure for easy accessibility and service access. A large 10.3-gal (39-L) refill capacity DEF tank is located in a lockable compartment directly behind the right side toolbox, and is sized to provide a 2:1 diesel to DEF refill ratio. Side-by-side radiator and hydraulic oil coolers make it easy to maintain and service the machine.
The excavator is equipped with Komatsu's EMMS (Equipment Management Monitoring System), which has enhanced diagnostic features to give the operator and technicians greater monitoring and troubleshooting capabilities for preventative maintenance, minimizing diagnostic, and repair time.