Komatsu zero-swing mid-sized excavators released

The 7.94-tonne PC78UU-10 and the 8.75-tonne PC88MR-10 are the two new low-emission zero-swing mid-size excavators from Komatsu

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 what they say is higher productivity and power while consuming less fuel than their predecessors.


Both models are powered by Tier 4. Final-compliant Komatsu SAA4D95LE-6 engines, rated at 49kW for both machines, and feature a new engine and hydraulic system control technology, with the PC88MR-10 having up to 16% more power than the previous model.

According to Carl Grundy, Komatsu’s national sales manager—utility, the two new excavators incorporate significant technology and performance advances over their Dash 8 predecessors.

"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 325mm while the PC78UU-10—UU is for ‘ultra-urban’—features an offset boom design ideal for the tightest worksite," he says.

"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 five percent."

To achieve lower emissions, while also lowering fuel consumption, Komatsu says 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," Carl says.

The electronic control system incorporates enhanced reporting and diagnostic capabilities, displayed via an on-board monitor. Additionally, it can be managed through the KOMTRAX remote monitoring system (supplied as standard on all Komatsu construction and utility machines).

Both machines are fitted with integrated ROPS cabs with OPG2 protection helping provide ample operator space and wide doorways for easier access. An automatic air conditioning system is standard as is a colour-reversing camera. For easy 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 helps simplify servicing.

New Komatsu excavators specifications


Operating weight  7940 kg
Engine Tier 4 Final-certified Komatsu SAA4D95LE-6 rated at 50kW
Bucket size range   0.28–0.34m3 
Maximum dig depth   4230mm 
Bucket breakout  6250kgf 
Arm breakout   4230kgf 
Operating weight 8750 kg
Engine Tier 4 Final-certified Komatsu SAA4D95LE-6 rated at 50kW 
Bucket size range  0.28–0.34m3 
Maximum dig depth 4110mm 
Bucket breakout  6250kgf 
Arm breakout  4230kgf 

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