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Farmall & IHC Tractors Discussion Forum
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Hydraulic Cylinder Gurus?

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Harley

04-30-2005 10:19:11




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Can anybody out there tell me about hydraulic cylinders? I have a wood splitter hooked to the hydraulics on an M through an open center handle valve on the splitter. My questions is this. The thing has a 43 in. long cylinder that measures three inches on the outside. Will say a four inch or bigger give it more pushing power, maybe because of a larger ram surface to push against? or am I just wishing. Got all this downed timber and need to do something with it. Thanks a bunch and keep yer planters in the wind. Harley

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Jim Becker

04-30-2005 15:50:08




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 Re: Hydraulic Cylinder Gurus? in reply to Harley, 04-30-2005 10:19:11  
With a 2 way cylinder, the oil level in the reservoir will change less than with a 1 way, but it will still change due to the displacement of the ram.

The other thing you have to think about is the strength of the rest of the splitter. If it wasn't considerably overbuilt, the 78% (or whatever) increase on load may bend the rail into a pretzel. Then you have a pile of scrap iron.



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PAULIH300

04-30-2005 16:32:06




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 Re: Hydraulic Cylinder Gurus? in reply to Jim Becker, 04-30-2005 15:50:08  
With my 300U came a homemade splitter that the previous owner had modified to hang off the Fast Hitch arms and would use the front loader dump bucket hoses to operate it (with quick disconnects).This thing was made with an I Beam from an old building and a huge cylinder (dual action)out of Lord knows what(its green,but I'm hoping its not JD.LOL).The splitting wedge is actually hand made with pieces of metal welded at an angle to a sharp point.This thing looks like it could split cast iron its so heavy (even 2 people cant really lift it up).I plan on adding hoses to it,cleaning and painting it up and running it from the front of the tractor (from the hose disconnects).Only problem...will need 2 people to run it...one to load and unload the logs and 1 to run the Hydra Touch control.

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Bob nor. mn

04-30-2005 11:41:55




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 Re: Hydraulic Cylinder Gurus? in reply to Harley, 04-30-2005 10:19:11  
also run the 3" ram all the way out and measure depth of oil left in tank , is there enough to fill larger 4" cyl. some tanks you can fill a little higher, otherwise you will need a larger tank.



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Ronald

04-30-2005 12:35:00




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 Re: Hydraulic Cylinder Gurus? in reply to Bob nor. mn, 04-30-2005 11:41:55  
With a wood splitter, it should have a two way cylinder, so oil will be going back into the tank each direction. So once you get the cylinder full, tank levels should remain the same in any cylinder postion.



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Ronald

04-30-2005 10:29:45




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 Re: Hydraulic Cylinder Gurus? in reply to Harley, 04-30-2005 10:19:11  
The bigger diameter of the cylinder the more power it will have. It will also work slower.



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Harley

04-30-2005 10:55:03




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 Re: Hydraulic Cylinder Gurus? in reply to Ronald, 04-30-2005 10:29:45  
Thanks Ron, the speed isn't a priority, cause I'm old, but ifn it will split the bigger stuff, I'm gonna look at it. thanks, Harley



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Bob M

04-30-2005 11:41:00




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 Re: Hydraulic Cylinder Gurus? in reply to Harley, 04-30-2005 10:55:03  
Harley - The force developed by a hydraulic cylinder varies with the SQUARE of the piston diameter. So going from a 4" to a 3" cylinder will increase the original force by 16/9 - about a 1.78 times increase in force.

The downside is the cylinder speed varies inversely with the square of the piston diameter. So in the above example the speed will be only 9/16 times the orginal speed - about a 44% speed reduction.

If you don't mind the slower speed, a bigger cylinder will solve your problem nicely!!

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Harley

04-30-2005 14:37:26




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 Re: Hydraulic Cylinder Gurus? in reply to Bob M, 04-30-2005 11:41:00  
Thanks Bob, with my calculations I was coming up with 25/54 ths and it just wouldn't compute with the variables incorporated within the logistics of the hydraulic ram pressure, minus the forward pressure of expelling the oil on the exhaust side of the ram, and minus the gradient resistance of said oil against the existing piping on it's way back to the resevoir. Your figures seem like they corelate a lot better than mine. Thanks so much. Harley

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