Page 54 - Hub-4 Magazine Issue 72
P. 54

  Quarrying
Doosan chosen again after 18,000 hours of untroubled service
The Wroński Group, a family company based in northern Poland, has purchased the latest generation Doosan DL420-7 wheel loader. This purchase decision was strongly influenced by the performance of their existing Doosan DL420- 5 wheel loader which has completed over 18,000 hours of trouble-free service and is still going strong.
The new DL420-7 is working in the Węsiory quarry, one of several businesses run by the Wroński Group connected with the construction industry. Founded in 1992, the company’s operations cover all of the territory of Pomeranian Voivodeship in Poland. The Wroński Group currently carries out general construction works and runs three building materials warehouses and a prefabricated products plant as well as the quarry, from which it obtains raw materials.
Proven Reliability
“We know the Doosan brand very well. The first machines in our fleet were two DL400s, which to this day are still used for smaller jobs," recalls managing director, Mateusz Wroński.
The company has always been focused on developing the business with regular investments in new equipment and in 2015, the Wroński Group management began discussions with Grausch and Grausch Maszyny Budowlane, the Authorised Doosan dealer for Poland.
“At that time, they offered us a new generation machine to test out, specifically the DL420-5 model. We were amazed by the speed and efficiency when working with the machine. The reduction in fuel consumption was so big compared to our old machine, that the money we saved allowed us to pay the leasing instalment,” Mateusz Wroński explains.
After the successful test, the machine never left the quarry in Węsiory, where it continues to work without any problems to this day, and has achieved an amazing 18,000 hours of problem-free work. “So in 2020, when we wanted to buy a new wheel loader, we immediately knew it would be a Doosan," adds Mateusz Wroński.
The new generation of DL-7 loaders
The need to purchase a new machine coincided with the introduction of the new generation of Doosan DL-7 wheel loaders. The existing products have been completely redesigned, and the number of standard functions on the machines again exceeds those on competing models. The company chose a new DL420-7 loader, which with an operating weight of 23.4 tonne, is one of the larger models in the new Doosan DL-7 range.
The DL420-7 is powered by a Scania DC13 6-cylinder engine producing 257 kW of engine output at 1800 RPM. The new engine meets Stage V emission regulations without the need for exhaust gas recirculation (EGR), through the use of selective catalyst reduction, diesel oxidation catalyst and diesel particulate filter (DPF) after-treatment technologies. The soot cleaning cycle on the DPF
has been improved to over 6000 h and the operator is fully informed about the status of the DPF via a soot level indicator on the new touchscreen display in the cab.
With no EGR valve and a choice of three power modes (SAT2, Standard or Power), fuel consumption is reduced by 5%. The machine performs very well in difficult terrain, thanks to another standard feature, the hydraulic differential lock (HDL), which is activated automatically at full torque without any additional action from the operator.
The five-speed PowerShift transmission gives the driver the option of three modes: manual, automatic or semi-automatic. A torque converter lock is also standard equipment, which significantly reduces fuel consumption during passes. The lift arm with Z-kinematics provides impressive breakout power and lifting capacity, while the large drop angle allows for efficient unloading.
The LIS (Load Isolation System) provides a smoother ride and higher comfort for the operator, as well as higher productivity due to improved stability when the wheel loader is moving. Following the supplier's recommendation, the bucket capacity has been increased from 4.3 to 4.5 m3 and the
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