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Hi Mike,

LOADER GOING UP:
Based on the cylinder sizes you give, I estimate that your loader will take over 3 times as long to raise with the new 3.5" inside diameter cylinders than with the old ones!

Why? The pump is unchanged so you still have the same volumetric oil flow rate from the hydraulic pump. This is the limiting factor. If you assume a 2" inside diameter for the old cylinders, the area ratio of the new to old cylinders = 3.5 squared divided by 2 squared = 3.0625 = 3 for our purposes. So if your loader used to lift in 10 sec, it will now take 30 sec.

On the positive side, your lifting capacity has also increased by a similar factor i.e. if you could lift 1 tonne, you can now lift 3 tonne. Force = Pressure x Area. However, be careful as your loader is not designed to cope with this loading.

Q. Why did you change the cylinders?

LOADER GOING DOWN:
The only constraint here is how fast the oil can return to the sump. Diggers have fast return hydraulics but I don't think that this is an option for you as your are constrained by the tractors system. On my Crystal, there is a throttle valve that controls the rate of drop of the lift arms. I don't know if this is in the same hydraulic circuit as the spool valve but if there is one of these fitted on your tractor, open it fully and see if this has any effect.

Hope this helps.

TomZ
Tom

<blockquote data-quote="treaney" data-source="post: 2132" data-attributes="member: 1728">Hi Mike,LOADER GOING UP:Based on the cylinder sizes you give, I estimate that your loader will take over 3 times as long to raise with the new 3.5&quot; inside diameter cylinders than with the old ones!Why? The pump is unchanged so you still have the same volumetric oil flow rate from the hydraulic pump. This is the limiting factor. If you assume a 2&quot; inside diameter for the old cylinders, the area ratio of the new to old cylinders = 3.5 squared divided by 2 squared = 3.0625 = 3 for our purposes. So if your loader used to lift in 10 sec, it will now take 30 sec.On the positive side, your lifting capacity has also increased by a similar factor i.e. if you could lift 1 tonne, you can now lift 3 tonne. Force = Pressure x Area. However, be careful as your loader is not designed to cope with this loading.Q. Why did you change the cylinders?LOADER GOING DOWN:The only constraint here is how fast the oil can return to the sump. Diggers have fast return hydraulics but I don&#039;t think that this is an option for you as your are constrained by the tractors system. On my Crystal, there is a throttle valve that controls the rate of drop of the lift arms. I don&#039;t know if this is in the same hydraulic circuit as the spool valve but if there is one of these fitted on your tractor, open it fully and see if this has any effect.Hope this helps.TomZTom</blockquote>

[QUOTE="treaney, post: 2132, member: 1728"] Hi Mike, LOADER GOING UP: Based on the cylinder sizes you give, I estimate that your loader will take over 3 times as long to raise with the new 3.5" inside diameter cylinders than with the old ones! Why? The pump is unchanged so you still have the same volumetric oil flow rate from the hydraulic pump. This is the limiting factor. If you assume a 2" inside diameter for the old cylinders, the area ratio of the new to old cylinders = 3.5 squared divided by 2 squared = 3.0625 = 3 for our purposes. So if your loader used to lift in 10 sec, it will now take 30 sec. On the positive side, your lifting capacity has also increased by a similar factor i.e. if you could lift 1 tonne, you can now lift 3 tonne. Force = Pressure x Area. However, be careful as your loader is not designed to cope with this loading. Q. Why did you change the cylinders? LOADER GOING DOWN: The only constraint here is how fast the oil can return to the sump. Diggers have fast return hydraulics but I don't think that this is an option for you as your are constrained by the tractors system. On my Crystal, there is a throttle valve that controls the rate of drop of the lift arms. I don't know if this is in the same hydraulic circuit as the spool valve but if there is one of these fitted on your tractor, open it fully and see if this has any effect. Hope this helps. TomZ Tom [/QUOTE]

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