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 11-26-2005, 14:13 Post: 119853
harvey



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 Hydraulics and flow of oil

We still do not have a hydraulics specific forum.

QUESTION: I heard, read, somebody said... The return line on a hydraulic reservoir "has to be below the fluid level or foaming will occur".

We have several different systems, at work, some below and some above. No resident experts. I've never noticed foaming in any of them, except when some air is sucked on the intake side of the pump.

I am in the process of building a 28 gal, 12"dia, vertical hyd tank for my splitter and my curiosity is churning. At this point it is a curiosity and not a burning life or death issue.






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 11-26-2005, 15:07 Post: 119855
hardwood

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 Hydraulics and flow of oil

I think the anti foam additives in the fluid have more to do with it than the point of return to the tank. Frank.






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 11-26-2005, 16:11 Post: 119859
Billy

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 Hydraulics and flow of oil

Don't know the answer to your question but I'm pretty sure hardwood got it.

My question is, why a 28 gal tank on a splitter?






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 11-26-2005, 17:46 Post: 119864
Chief



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 Hydraulics and flow of oil

I noted the same question as Billy. My log splitter tank holds maybe 5 to 7 gallons tops. 28 gallons is a LOT of fluid to pay for at about $25 a 5 gallon pale for the el cheapo fluid.






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 11-26-2005, 17:53 Post: 119866
psimonson

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 Hydraulics and flow of oil

Keeping the return line covered with fluid is beneficial because there is less splashing within the tank and splashing will create some air bubbles.

Your tank sounds huge for a splitter application. You could get away with as little as 3 or 4 gallon tank capacity, maybe 8 gallons as an upper limit. More fluid will take longer to heat up, good if you do this full time, but keep in mind that some heat is a good thing to control moisture that invariably accumulates through condensation.

The volume of oil in the tank will change a little as the cylinder travels from fully retracted to fully extended. Assuming a 30” stroke cylinder with a 2” diameter shaft, the tank will go down by about 1.6 quarts as the cylinder goes from fully retracted to fully extended. This isn’t enough to materially affect your overall tank size.






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 11-27-2005, 05:01 Post: 119901
harvey



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I was hoping it was something like anti foaming... Now I am a little concerned about the moisture issue. But I'll cross that bridge after I start to work the beast.

It is a splitter I am building from odds and ends. See # 5&6. The frame is 16' now.

Any ways I found a small 4BT 3.9L Cummins with a 30gpm pump on it, in the back hedge row at work. Only had 25 hrs on it total been sitting for 10 years un-run. Had water in the crankcase...The price was right, "FREE" (well probably not free with all the FOT (freeOT) I put in), so I drug it home pulled pan soaked all the internal surface parts good with Zep 45. There was very minimal rust in side only some superficial surface rust. I pressure lubed it with a gal of oil. Fired it up. I runs beautiful...

Cutting up the rest of the machine for scrap steel.

Have reinforced the splitter beam. Going to add a 5X24 cylinder, 4 or 6 way wedge.

With the 30 gpm pump 20-25 gal hyd fluid will be on the light side but dooable. I do not plan to run it hours on end.

I'll probably send "Tim Allen" a photo Smile

To date I might have $300 in it Plus 100+ hours of tinkering, thinking and scheming...






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 11-27-2005, 05:08 Post: 119902
Chief



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In that case, it sounds like a prime candidate for a Dodge Dakota Quad-Cab 4 x 4 transplant project truck. I am sure AV8R and I would be drooling over that vehicle! ;O)






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 11-27-2005, 05:16 Post: 119903
harvey



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 Hydraulics and flow of oil

Morning Randy

I was busy making an edit.

YUP I have looked at a old Jeep a couple of times now to find a small 8 speed Roadranger...

A 100HP turbo charged diesel with a 8 speed would be COOL!






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 11-28-2005, 09:42 Post: 119974
Art White



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 Hydraulics and flow of oil

Great find Harvey!!! I do think Tim Allen would appreciate it!






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