I don't really understand the presence of the hard lines on the oil cooler circuit... is it vibration or heat related?

I worked at a hydraulic shop and our heaviest duty 4 wire flex hose that probably had a higher burst than those hard lines, not to mention a working temperature well in excess of what my 617 will ever see.

Any good reasons why I shouldn't go with the 4 wire with a ballistic nylon/kevar sheath?

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Cheers,
Robert