Hydraulic cylinder size

ryanwheelock · Jul 14, 2010

Question with a cylinder I'm using to lift implements behind my farmall H. I bought a 2" shaft Hydraulic cylinder that I wanted to use on my NH haybine, hay rake and Oliver disc. I wanted to use the same cylinder on all 3 but the problem is it'll lift the rake easy and the disc will lift 3/4 of the way up and the haybine not at all. I'm running out of hydraulic power I think. Someone on here weeks ago said he uses a Farmall H and can lift his haybine with the tractor hydraulics. If I went to a 3" shaft size I know it would be slower to lift and would take more fluid but would it give me more lifting capcaity???? If not should I tear into my pump and check the clearances??
Thanks
Ryan

glennster · Jul 14, 2010

first thing i'd do is get a pressure gauge on the hydraulics and see what kind of psi the pump is putting out. the early belly pumps would put out around 600 psi or so, the later around 800-1000 psi. not a whole lot of pressure. if you have pressure in that range, you will need to go to a bigger diameter cylinder, or add a second cylinder of the same size as the one you have. also check to see if you have enough oil capacity to run the cylinder when it is fully extended.

the tractor vet · Jul 14, 2010

Ya need a 3x8 cylinder and that should do the trick .If your pressure is running at the 800-1000 PSI .

Jaden · Jul 14, 2010

Lifting force of a cylinder is the pressure (PSI) times the effective area(square inches) of the piston. That means to lift more, you need more pressure and/or a bigger bore cylinder. You will also get less force when retracting the cylinder because the effective piston area is reduced by the area of the rod.

gene bender · Jul 14, 2010

Cyclinder go by bore and stroke for power and you probasbly should go with a 4in for the heavy stuff. Newer tractors have more pressure and flow and your haybine is heavy.

Leroy · Jul 14, 2010

Are you running it as a single acting with one hose or double acting with 2 hoses? if dounle you will not have to worry about oil supply as the return side of cylinder will replace any used for raising. Now on our 41 H that we had years ago we ran a single acting cylinder with it of 3" on a 9" haybine but ours lifted only the platform. On models that lifted the whole machine we would have needed a 4" cylinder. And the cylinder is not measured by rod size as that should remain between 1" and 1 1/8" depending on cylinder model, you are just using the piston diameter or bore size to get either the 2", 3" or 4" size. Disk will need the 3" or possibly the 4 depending on disk, thinking the 3" will be ok on disk but sounds like you have the type of haybine that lifts the entire machine and then you will need a 4" on it and it will be verry slow, the larger the cylinder the slower action.

Thresherman · Jul 14, 2010

A 2" is too small for the others. the rake is light so it lifts fine. A 3"BORE has 1/3 more capacity of 2". I had one on my 461NH haybine and it was border line. A 4"BORE has twice the capacity of 2" and should be what is used. Chances are it will be FASTER than the smaller cylinder. Leave the one you have on the rake, and buy a bigger one for the others. Don't skimp, it will only make angry.

thurlow · Jul 14, 2010

Might want to re-figure the capacities of a 3 and 4 inch cylinder as compared to a 2 inch..........

Zachary Hoyt · Jul 14, 2010

I have an H and a NH 461. The cylinder is a 3x8 and it lifts the head with no effort. May also see how much strength it takes to lift the head and adjust the float springs if you need to. Mine I can lift the head by hand by grabbing the bar in front of the reel so I know there is not too much weight on it.
Zach

Earl Gray · Jul 14, 2010

A 3" cylinder has more than double the area of a 2" cylinder. 3x3x.78=7.02, 2x2x.78=3.12

GordoSD · Jul 14, 2010

For comparison I have a 2 inch cylinder on a Gehl 2160 Haybine which has a heavier head than your 461;
I am pulling with a brand new CaseIH Farmall 95. I have to be careful when raising it or it just SLAMS up against the stops when raised.

Gordo

Pete in MD · Jul 14, 2010

A 3" bore has 2.25 times the lifting capacity of a 2" bore.

A 4" bore has 4 times the lifting capacity of a 2" bore

Hydraulic cylinder size

ryanwheelock

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glennster

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the tractor vet

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Jaden

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gene bender

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Leroy

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Thresherman

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thurlow

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Zachary Hoyt

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Earl Gray

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GordoSD

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Pete in MD

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