by Kyle Molyneux | Tue 10 Jan 2023
Doosan launches new DX85R-7 excavator
Doosan has launched a new, 8-tonne DX85R-7 mini-excavator, the latest addition to the company’s next generation range of Stage 5 mini-excavators. The DX85R-7 reduced tail swing (RTS) excavator utilises a newly improved upper structure platform offering increased durability and robustness and a different boom swing cylinder layout resulting in an increased boom swing angle of 60 degree.
Together, the RTS design and boom swing angle make the DX85R-7 ideal for work in confined spaces on projects in construction, landscaping, utilities, rental, agriculture, recycling, waste and many other areas. The bucket digging force of the DX85R-7 is 6.7 tonnes and this is combined with a traction force of 6.6 tonnes, whilst travel speeds are a mobile 2.9km/h in the low range and 4.8km/h in the high range.
As well as sharing the new global styling common to all the new Doosan mini-excavators from 2- to 10-tonne, the DX85R-7 is powered by the Doosan D24 Stage 5 compliant diesel engine providing 48.5kW (65hp) at 2,100rpm. As a result, the DX85R-7 excavator offers excellent fuel efficiency, among the best in its class reckons Doosan.
It also combines exceptional power output and high torque at low rpm, more than 9% more than the previous DX85R-3 model. A combination of Diesel Oxidation Catalyst and Diesel Particulate Filter aftertreatment methods ensure compliance with Stage 5 regulations. The DPF offers a 25% increased ash cleaning period of 5,000 hours compared to the DX85R-3.
High comfort cab
With a height to the top of the cab of over 2.6m and a width of 2.25m, the new cab on the DX85R-7 is especially roomy and comfortable says Doosan. The cab has a full glass entry door to maximise operator visibility on this side of the machine from inside the cab. The four standard high luminance LED work lamps on the cab further enhance visibility.
Key features of the new cab include an enhanced heating and air conditioning (HVAC) system, 8-inch touchscreen display, air suspension seat with heating, thumbwheel Joystick, auxiliary flow control in the cab and foldable pedals. Protected by a Falling Object Protection Structure, the safety of the operator in the cab is further optimised with a rear view camera as standard and an optional Around View Monitoring 360 degrees (AVM) system offering a choice of five views on the display (Bird view, Rear, Bird view + Right, Rear + Corner and 3D).
Main Control Valve
A new series main control valve (MCV) is utilised in the DX85R-7, that has improved performance by reducing the internal pressure loss, compared to the DX85R-3. The new MCV cuts energy wastage and pressure losses by over 40%, significantly reducing operating costs. The central location of the MCV also enhances its maintainability and helps to optimise the work visibility from the cab.
An improved working range has resulted from the new position of the boom foot point, which has been moved forward by 100mm and upwards by 50mm. The DX85R-7 also offers improved lifting power and stability through a number of design changes, including the 127mm increase in the tumbler length (2,952mm), a redesigned undercarriage with lower ground approaching angle, an expanded rear swing radius and dual flange and double profile roller for both rubber track and steel track type shoes.
Dozer improvements on the DX85R-7 have increased the jack up height/digging depth and the lift angle. A newly designed 1.45-tonne cast counterweight also ensures excellent machine balance and stability when working. The DX85R-7 offers full reach maintenance from ground level via a 3-part (Centre/LH/RH) rear bonnet cover, providing easy access and simple maintenance. A well-designed mesh cover has been applied for preventing dirt from coming in. The high efficiency pre-cleaner and two-stage air cleaner filters are easy to maintain and disassemble using clips.
The DX85R-7 mini-excavator has Doosan’s latest DoosanConnect system installed as standard, which provides a telematics management system for the excavator, by collecting data from sensors on the machine.
Key stats
Key stats for the new Doosan DX85R-7 excavator include a 9,528kg operating weight, 4,110mm digging depth, 7,015mm digging reach and 4,705mm dump height. Digging force over the 0.28m3 bucket is 6.7 tonnes (ISO) with 4.46 tonnes over the arm (ISO). Boom swing angle is 60 degrees left/right, rear swing radius 1,465mm and track shoe width 450mm. Auxiliary hydraulic flow hits 149L/min. Overall dimensions are 2,657mm (height) and 2,250mm (width); 6,640mm (travel position).
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