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adius and a tail radius of 1680mm, his
diameter is much less than some notable
competitors. The rear overhang beyond the
edge of 800mm wide tracks is only 85mm -
compared to 1070mm for the conventional
configuration DX225LC with the same size
track shoes.
Enhanced excavating force
The DX235LCR is powered by a 6-cylinder
Doosan DL06 turbocharged diesel engine
providing 125.0kW (166hp). This is 13.4kW
(18hp) more than the conventional
DX225LC and this contributes to enhanced excavating force. Digging force over the bucket is 14.2 tonne, while that
over the arm is 10.3 tonne. Use of power boost increases both forces by about 5% which, Doosan contends, are the
highest forces of any excavator in this class.
Thanks to the high engine power and the high swing torque, the DX235LCR can work efficiently on slopes. Its
slewing speed is 11.3rpm and, when equipped with the longer 2900mm dipper arm, the machine can dig down to
6670mm.
The DX235LCR is equipped with the same cab as the smaller DX140LCR. This has a durable hinged door which
can be clipped back neatly against the superstructure. Inside the cab is quiet (the stated noise level is 72 dB(A) at the
operator’s ear) and comfortable.
Visibility is good and the operator gets both a rear view spherical mirror and a camera to see behind in order to
enhance safety when working in a confined space. Like its smaller brother and other Doosan DX excavators, the
DX235LCR gets the e-EPOS (Electronic Power Optimising System). Designed to balance the hydraulic power
requirement to available engine power, e-EPOS effectively manages the hydraulic pumps to reduce fuel consumption.
The machine has a manually selected ‘auto idle’ fuel saving feature together with two speed travel (up to 5.8 km/h
or 3.1 km/h), a straight travel pedal for trenching and a power boost button to raise hydraulic pressure for between 10
and 12 seconds in order to provide a burst of greater breakout as required during hard digging.
Smooth and precise operation
During a stint at the controls of the DX235LCR I was impressed by the
ability of the load sensing piston pump and the closed centre valve to
allow fine metering of hydraulic flow to enable me to effectively carry out
precise grading. Smooth operation is aided by the provision of end-of
stroke cushioning on the boom and dipper arm cylinders.
I found the machine to be very stable to operate and this virtue will
make it attractive for use with a wide variety of attachments. To improve
its operational flexibility, the new DX235LCR can be supplied with the
same auxiliary hydraulic lines as can be fitted to the conventional
DX225LC.
Engine service intervals are 500 hours and the DX235LCR also
shares the extended lubrication intervals of the whole Doosan excavator
range. To facilitate servicing the machine has hinged side panels. The
water trap and the engine oil filter are both located in the hydraulic pump
bay on the offside for easy access from the ground level.
This machine clearly has the power to perform and its availability
should help to increase the population of this size of short tail excavator
on sites with limited operating space. To appeal to contractors and rental
companies in countries such as Italy where narrower machines are
popular, Doosan will shortly introduce a DX235LCRN version.
Page 24
The LED monitor panel in the cab of the DX235LCR
has different information displays as well as
buttons for mode, flow rate and auto deceleration selection.
The compact, curved superstructure and the
access to the Doosan DL06 turbocharged
engine can be clearly seen in this aerial view
of the DX235LCR.
CP&E Contractors Plant & Equipment Vol 1 No 6