Komatsu has released two new low-emission zero-swing mid-size excavators, the 7.94 tonne PC78UU-10 and the 8.75 tonne PC88MR-10, delivering higher productivity and power while consuming less fuel than their predecessors
They are powered by Tier 4 Final-compliant Komatsu SAA4D95LE-6 engines, rated at 49 kW for both machines, and feature new engine and hydraulic system control technology to reduce fuel consumption.
“These two excavators have been renowned for being incredibly versatile and productive machines, ideally suited for excavation, rock work and services placement in confined urban areas; with these latest improvements, they are even more productive and efficient, while being less expensive to own and operate,” Komatsu national sales manager – utility Carl Grundy says.
Both new units are built with tight access in mind, the PC88MR-10 – MR stands for ‘minimum radius’ – with its swing boom design has a tailswing protrusion of just 325 mm while the PC78UU-10 – UU is for ‘ultra urban’ – features an offset boom design ideal for the tightest worksite.
“Our environmentally friendly Komatsu SAA4D95LE-6 Tier 4 Final engine drastically reduces emissions compared with the previous machines’ Tier 3 engine, while reducing fuel consumption by up to 5 per cent.”
To achieve these lower emissions, while also lowering fuel consumption, the engines include newly designed variable flow turbochargers, cooled exhaust gas recirculation, a Komatsu diesel oxidation catalyst, and an advanced engine control system.
“With this engine design there is no need for DEF (Adblue) or a diesel particulate filter (DPF), further reducing maintenance and running costs of these machines.”
Detailed engine condition information is displayed via an on-board network to the monitor inside the cabin.
Komatsu has also increased engine power 16 per cent on the PC78UU-10, for higher site productivity.
Both machines incorporate new Komatsu technology to enhance the engine and hydraulic pump control.
“Our total control system matches the engine and hydraulics at the most efficient point under any load condition.
“At the same time, there have been improvements in the main valve and hydraulic circuits to reduce hydraulic loss, resulting in higher efficiency and lower fuel consumption.
“Overall, with these two machines we are seeing up to 5 per cent lower fuel consumption, combined with up to 3 per cent higher productivity.”
To further improve jobsite productivity and efficiency, both machines offer six working modes: power, economy, lifting, breaker, attachment power and attachment economy mode.
Each mode is designed to match engine speed, pump flow, and system pressure to the application, so that the most efficient combination of engine and hydraulic power is used.
“We’ve also included some operator aids to encourage fuel-efficient operation at all times.
“These include an ECO gauge to assist in reducing fuel consumption during operation, a idling caution if the engine idles for more than five minutes, and idle auto stop function that automatically stops the engine if it idles for more than a set period of time.”
Both machines are fitted with integrated ROPS cabs with OPG2 protection offering ample operator space, and with wide doorways for easy access. An automatic air conditioning system is standard, as is a colour reversing camera.
For ease of maintenance, component access has been optimised with all major maintenance points accessible from ground level, while remote mounting of the engine oil filters, main fuel filters and fuel drain valves simplifies these tasks.
Specifications
PC78UU-10: Operating weight, 7940 kg; engine, Tier 4 Final-certified Komatsu SAA4D95LE-6 rated at 50 kW; bucket size range, 0.28-0.34 cu m; maximum dig depth, 4230 mm; bucket breakout, 6250 kgf; arm breakout, 4230 kgf.
PC88MR-10: Operating weight, 8750 kg; engine, Tier 4 Final-certified Komatsu SAA4D95LE-6 rated at 50 kW; bucket size range, 0.28-0.34 cu m; maximum dig depth, 4110 mm; bucket breakout, 6250 kgf; arm breakou0.t, 4230 kgf.
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