long reach advice

Good day td
As to the best of my experience swing speed has never been an issue of course side sweeping should be avoided as with long reach you can twist and crack equipment. Frequent inspection should be adhered to as the equipment is likely to require more attention.
I suggest that you avoid pin grabbers and quick hitch device's these will cost your lifting capacity & stability. Normally the bucket would be cast to the far reach only raising as it completes the cycle to the nearside, the machine operation is more like the wire rope machines of yesteryears. As John C. pointed out it is less of a digging machine and more of a cleaning device often operators find this hard to understand, the addition of a floating device will without doubt prevent boom - arm and cylinders a lot of stress with the added bonus of reducing fuel consumption.
Sorry for the novel.
Kind regards
Uffex

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High-reach excavators are required for high-profile demolition projects, and controlled construction, and are essential for underwater dredging and amphibious excavation. Trench shoring is an industry-standard requirement when digging depths exceeding 5 or more feet unless you are digging solid rock. Trench box requirements are mandated by OSHA and determined by project managers and engineers before work begins. 

For more information, please visit rock ripper for excavator.

Trench shoring ensures the safety of the job site, all employees, and the actual integrity of the environment you are working in regardless of the scope of excavation. Trench shoring minimizes soil shifting during excavation and promotes a more controlled dig. Shoring also mitigates the risks of hitting gas lines and other existing utility lines. Trench collapses are serious risks whether you are working on dry land moving dirt or dredging ponds that may have potential sinkholes. Working in a controlled manner must be the priority of all operators and job site management. 

ADDITIONAL Information: https://www.osha.gov/sites/default/files/publications/trench_excavation_fs.pdf

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