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acd17toy 
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Joined: 11 Sep 2009
Location: USA
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 Topic: hydraulic cylinder
Posted: 02 Nov 2019 at 6:57pm |
Need to replace a bad hydraulic cylinder, will a bigger cylinder give more lifting
power, without changing the pump pressure?
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Jim.ME
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Joined: 19 Nov 2016
Location: Maine
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Posted: 02 Nov 2019 at 7:50pm |
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Yes, same pressure applied to larger area (bigger diameter) will develop more force.
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Coke-in-MN
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Joined: 12 Sep 2009
Location: Afton MN
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Posted: 02 Nov 2019 at 11:28pm |
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Yes lifting capacity will increase but speed will decrease in cycle time .
Take your PSI and flow rate and multiply by sq in of the piston will give you a idea of what you gain or lose .
Surplus Center might have what you need at the price you can afford for new cylinders .
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Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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KJCHRIS
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Joined: 21 Dec 2015
Location: WC Iowa
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Posted: 03 Nov 2019 at 12:08am |
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As already said, lifting force will go up but the trade off is that speed of raising & lowering will slow down.
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AC 200, CAH, AC185D bareback, AC 180D bareback, D17 III, WF. D17 Blackbar grill, NF. D15 SFW. Case 1175 CAH, Bobcat 543B,
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acd17toy
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Posted: 03 Nov 2019 at 7:01pm |
Good deal as the present cylinder is faster than I like, so a bigger cylinder will slow things down.
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Ted J
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Posted: 04 Nov 2019 at 3:12pm |
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NOW what are you foolin around with Jim? Something fun?
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
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jaybmiller
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Joined: 12 Sep 2009
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Posted: 04 Nov 2019 at 4:55pm |
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hmm.. if there's lots of GPM, it'll raise as fast as the orginal ?
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Tbone95
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Posted: 05 Nov 2019 at 9:38am |
 jaybmiller wrote:
hmm.. if there's lots of GPM, it'll raise as fast as the orginal ?
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Nope. For a constant flowrate, Velocity is proportional to the cross sectional area. It's called the continuity equation Q (cu ft/s) = V (ft/s) x A (sq. ft) Rearrange to suit, and use any units such as ft, inches, meters, doesn't matter as long as you use the same in all three terms.
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jaybmiller
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Posted: 05 Nov 2019 at 10:34am |
well that's a bummer... I found this... Cylinder Speed (ft/min) = 19.25 x flow rate (gpm) / area (in²)
which says to me if you can increase flow rate(gpm), it'll go faster.. so bigger hoses would mean it'll go faster ?
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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Tbone95
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Posted: 05 Nov 2019 at 10:57am |
jaybmiller wrote:
well that's a bummer... I found this... Cylinder Speed (ft/min) = 19.25 x flow rate (gpm) / area (in²)
which says to me if you can increase flow rate(gpm), it'll go faster.. so bigger hoses would mean it'll go faster ?
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Yeah, if you increase flowrate, it'll go faster. We're talking hooking a bigger cylinder up to the same tractor, so the flowrate is virtually the same, so the cylinder will move slower. Bigger hoses? No, bigger pump, or in more complicated modern systems, more oil delivered by the pump via it's load/ flow sensing mechanisms, but still, the diameter of the hose would mean hardly anything as far as being less restrictive. Centrifugal pump feeding a water line, totally different scenario compared to a vane, or gear or other positive displacement type pump.
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Tbone95
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Posted: 05 Nov 2019 at 10:59am |
jaybmiller wrote:
well that's a bummer... I found this... Cylinder Speed (ft/min) = 19.25 x flow rate (gpm) / area (in²)
which says to me if you can increase flow rate(gpm), it'll go faster.. so bigger hoses would mean it'll go faster ?
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In your equation, 19.25 comes from dividing 144 by 7.48. 144 is conversion of square feet to square inches, 7.48 is converting gallons to cubic feet. It's my equation pre-worked out for you! 
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jaybmiller
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Posted: 05 Nov 2019 at 11:27am |
here's where I borrowed it from...
.. too many equations and numbers for me today... head hurts from looking at the garbage truck and seeing the can of worms hydraulics on it !
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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