Extracting Blue Quartzite with a Liebherr R 992 Crawler Excavator
Liebherr’s Generation 5.2 and 6.2 crawler excavators, in the 70–100 tonne range, were unveiled to the public at the last Bauma. The R 972, R 978 SME, R 992 and R 998 SME models replace the R 966, R 970 SME, R 976 and R 980 SME models respectively.
These new excavators, developed with a particular focus on reducing fuel consumption, also feature other improvements, such as enhanced performance data, optimal operator comfort and new operator assistance functions.
Challenging working conditions in the extraction of blue quartzite
Extracting rock in quarries is the R 992’s main task at the site of CMSE (Carrières & Matériaux Sud-Est). The machine’s high tooth force, reliability and precision are guarantees of quality in this challenging application. It is specially equipped with piston rod guards, an HD undercarriage and a 5.20 m3 HDV bucket with guide rails for a drop ball.
The bucket is specially reinforced, as the high abrasiveness of digging blue quartzite, the primary product from this quarry, demands a specifically adapted cutting tool. After blasting, the excavator loads lumps of rock into the three dump trucks that take the material to the crushing station.
Liebherr Bucket Fill Assist (BFA) and Liebherr Power Efficiency (LPE) improve performance
The R 992, like all models of the new generation, comes with the Bucket Fill Assist (BFA) assistance system and the Liebherr Power Efficiency – Engine Control (LPE) system. CSME uses BFA for a higher bucket filling level and optimal penetration into the rock.
This system improves operator comfort by reducing vibration and reduces fuel consumption by 10%. At less than 60 litres per hour, the excavator’s current fuel consumption is lower than that of their previous excavator. CMSE also appreciates the Liebherr Power Efficiency – Engine Control (LPE) system, which provides optimal control of machine power. It actively regulates engine speed and the hydraulic pumps’ angle of inclination.
A major player in the first link of the construction chain
CMSE, a subsidiary of Colas France, has 40 quarries across 18 French locations. The Saint-Pons-de-Thomières quarry, where the R 992 is in operation, produces, distributes and sells aggregates for public works construction sites and has previously supplied materials for race car tracks in France and other countries.
The choice of a Liebherr Generation 6.2 excavator was based on the customer’s wish to acquire a robust, high-performance machine with low fuel consumption. As a holder of the UNICEM Cap Environment label, the CMSE is particularly keen to reduce CO2 emissions across its entire fleet.
