Maintenance Products

70 tonner at top of crawler range

Doosan’s largest crawler excavator, the DX700LC, is designed for heavy-duty quarrying and mining applications.

Powered by a 345kW turbocharged diesel engine, the DX700LC has an operating weight of 70,100kg with standard boom and arm, 650mm double grouser shoes and 3.3m3 bucket. Optional buckets range in size from 3m3 to 4.5m3.

The bucket breakout force is 35.7 tonnes with the standard bucket, while the arm breakout force is 29.3t. Maximum digging reach is 13,250mm at ground level and maximum digging depth is 8410mm. The dump height is 8320mm.

The DX700LC’s long carriage (LC) design, along with the 4250mm width of the fully expanded undercarriage, offers optimum stability and safety in all kinds of digging, lifting and loading applications. With a high swing torque of 22,070kg force metres, the DX700LC works efficiently on slopes. The swing speed is 7.1 rpm.

The six-cylinder “common rail” diesel engine features a high pressure fuel injection system that improves combustion efficiency while reducing particulate matter. Simultaneous exhaust gas recirculation (EGR) lowers the combustion temperature, reducing nitrogen oxide emissions on the Tier 3 engine.

An electronic power optimising system (EPOS), connected to the engine’s electronic control via a data transfer link, harmonises the operation of the engine and the hydraulic system, further minimising fuel consumption.

The DX700LC offers a new power mode control system, with four modes:
• Power mode for heavy-duty digging and loading.
• Standard mode for heavy-duty dumping, and general and breaker operation.
• Economy mode for medium-duty digging, loading and dumping.
• Lifting mode for lifting pipes or beams.

The unit’s positive control piston pump and open centre valve enable fine metering of hydraulic flow for smooth, precise control of machine functions. Flow regeneration conserves energy and enables increased boom and arm cycles. The boom and arm cylinders are cushioned to provide smooth end-of-stroke operation while the holding system prevents attachments from falling when the controls are in the neutral position.

An automatic two-speed travel system controls travel speed and tractive force. In high range, the maximum travel speed is 4.7km per hour. The drawbar pull is 49t.

As with all Doosan excavators, the operator’s cab is spacious, quiet and comfortable, with ergonomic controls and instrumentation. Joystick control stands raise and lower with the suspension seat while the seat slides forth and back to accommodate any operator.

The DX700LC is also designed to keep machine noise levels as low as possible to reduce operator fatigue. The noise level at the operator’s ear is 76 decibels (dBA) while the noise level for bystanders is 108 dBA.

The DX700LC shares the extended lubrication intervals of the entire Doosan excavator range, including 500-hour engine service intervals. Other ease of maintenance features include:

  • Wide side access doors that make cleaning radiators and coolers quick and easy.
  • A large capacity engine air precleaner that removes over 99 per cent of airborne particles and extends filter cartridge service life.
  • Dual fuel precleaners, including a prefilter that removes nearly all moisture from the fuel for smooth engine operation.
  • A PC monitoring function that connects to the EPOS, allowing various machine parameters to be checked during maintenance.

Source: Clark Equipment

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