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To prevent corrosion, to keep things clean, to act as a heat sink, and to act as a reservoir.I looked it up on the net and this is from a Grove RT5xx series crane... at least that is what it resembles from the photo I found. More snooping reveals that it is a 9" diameter x 38" stroke and there are seal kits available on the net, too. Grove evidently used the same boom lift cylinder on multiple models of machine.
It doesn't spell out what seals you get that may give some clue as to what I have.
I am torn between two answers. R. Dan and ABarnsley.
Mr. Barnsley.... if this was just single acting, why would there be oil on that side of the piston in the first place- to give the piston a little cushioning action?
and use W-FLT for retract lines exactly the way those are done. Also, can't tell from the second pic, but it looks like there may be some type of port block for plumbing? If so, see if there are c'balance or p.o. check valves.
Hydraulic fluid line tubing, soft annealed.What is "W-FLT" ? And, yes, those blocks do have some sort of a check valve built in the bottom of the block....
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