Smooth controls and high digging forces, complemented by low weights for easy transportation – that’s what Doosan is promising for its new 2 – 4 mini excavators.
The concept of zero tail swing – where the body of the excavator doesn’t go beyond the width of the track – is not a new one, but has been gaining ground year on year. Indeed, the mini excavator market as a whole has been a class of construction machinery that has seen significant increases in sales of late, and is one of the most competitive for manufacturers as a result.Even with the optional heavy counterweight, the 2.7 tonne Doosan DX27z is a true zero tail swing (ZTS) machine, offering flexibility of movements when working close to walls, for example, whilst the unit equally boasts the largest cab for this size of machine on the market.
Stage V 6 and 8 tonne mini excavators
Doosan has also launched new versions of the company’s DX62R-3 and DX63-3 6 tonne and DX85R-3 8 tonne mini-excavators that meet Stage V engine emission regulations.
The new Stage V DX85R-3 8 tonne reduced tail swing (RTS) excavator is powered by the Yanmar 4TNV98C Common Rail direct injection diesel engine, providing 44.3 kW of power at a rated speed of 2,100 rpm. It meets Stage V emission requirements through the use of exhaust gas recirculation (EGR) and diesel particulate filter (DPF) after-treatment technologies.
The new Stage V versions of the 6 tonne DX62R-3 RTS and DX63-3 conventional tail swing models are powered by the same Yanmar 4TNV98C diesel engine, providing a massive 22 per cent increase in engine power over the previous generation models.
Enhanced hydraulic performance
As well as the increase in engine power, another of the stand-out features on the 6 tonne excavators is the hydraulic performance, with a maximum flow rate of 132 l/min. The hydraulic system incorporates a load sensing system which guarantees high hydraulic performance and allows smooth and efficient combined operations.
This is complemented by the high digging forces on both machines – the bucket digging force is 4.4 tonne and the arm digging force is 2.9 tonne. This is combined with a longer arm for a better overall working range. The traction force is 5.6 tonne and travel speeds are 2.6 km/h in the low range and 4.7 km/h in the high range.
The DX85R-3 excavator offers excellent fuel efficiency, among the best in its class. The bucket digging force is an impressive 6.3 tonne and this is combined with a traction force of 6.6 tonne, whilst travel speeds are 2.7 km/h in the low range and 4.7 km/h in the high range.
All five new Doosan Stage V mini-excavators are designed to offer maximum performance, versatility, operator comfort, durability, ease of maintenance and serviceability in their respective classes.
Operator comfort
The new mini-excavator cab features significantly larger windows and narrower pillars, giving all-around visibility. Inside the low noise-low environment, the operator has the benefit of new joysticks and new optimised metal travel pedals. The new minimal effort joysticks offer further enhanced controllability and smoothness of working functions.
Low noise & optimum safety
The space available in the ROPS operator cabs on the DX62R-3, DX63-3 and DX85R-3 mini-excavators is similar to that found on much larger medium and heavy-duty machines. The cabs have a large entrance and exit, ensuring it is easy to get in and out of the machines.
A high capacity heating and air conditioning system is standard, with fully adjustable vents installed at both the front and rear of the operator’s seat to maximise efficiency. The interior of the cabs has been ergonomically designed to optimise operator comfort and features an ample foot rest area and an additional cup holder, and the openness of the cabs provides a wide field of view and excellent all-round visibility. The cab lighting, sun visor and side mirror all contribute to a safe and pleasant working environment for the operator.
Maintenance
Easy maintenance procedures are facilitated by convenient check points, while a tilting cab simplifies service work. The large-capacity radiator enables performance in severe and continuous operations. Access to the radiator and cooler is easy, making cleaning a simple process. The various parts of the engine can be accessed from the side, with the engine oil and fuel filter attached to the engine body extending out for easy maintenance.
