Hydraulic question of the day

[Hacksawhero123 351]

Hopefully someone here knows hydraulic science. My idea is to fab the mounts under the seat and onto the axle tubes to mount a hydraulic cylinder to lift and lower the hitch independent from the deck lift cylinder. I'm going to stack another spool valve with the factory valve that came one my C160. The cylinder I'm looking at using is a 1.5" bore with 6" or 8" stroke 1" rod. The million dollar question is "do I have enough oil reservoir in the factory system to add this cylinder?"  I don't want to starve the pump when the cylinder is full of oil at full extension. Thanks for any help. 

Mark. 

[wallfish 17,000]

With a double acting cylinder, the difference in fluid volume to the reservoir is the same volume as the rod since fluid flows out as fluid flows in.

The rod takes up space in only one side of the cylinder when retracted. The change in fluid level from fully retracted to fully extended for that rod is about 3.5 fluid oz.

Volume of 1" rod x 8" long = 6.28 cu inches--6.28 cu inches converts to about 3.5 fluid oz.

There are plenty of online calculators to confirm this.

So not much change to the fluid level.

 

Make sense?

 

Much different for a single acting cylinder. It's the total volume of the cylinder and not the rod

Edited November 22, 2016 by wallfish

[Hacksawhero123 351]

Ahhh. That make perfect sense now. Thank you, Wallfish. I was looking at it from the point of single acting and robbing fluid when extended instead of having fluid on each side of the piston. I can answer all of your electrical questions, but hydraulics are out of my knowledge. Thanks again, Sir. 

Mark. 

[wallfish 17,000]

No problem!

 

6 minutes ago, Hacksawhero123 said:

I can answer all of your electrical questions

Can you please explain why they build electronic stuff with that magic smoke? Every time it gets out, nothing works again!

Edited November 22, 2016 by wallfish

[Hacksawhero123 351]

In the old days it was steam, but the high pressure was dangerous. So in the interest of safety, now we use low pressure smoke. 😂

 

And if you will buy that.....

Mark. 

[wallfish 17,000]

 

Thanks for the laugh!

Forgot to mention you could probably get by with a smaller bore cylinder. My small back hoe uses 2" bore x 1" rod rams but higher pressure. Something smaller might make it easier to fit in there. 

Here's a cylinder calculator to help determine a size. I'm not 100% sure but think a hydro trans is about 700 psi

http://www.engineeringtoolbox.com/hydraulic-force-calculator-d_1369.html

Edited November 22, 2016 by wallfish

[Hacksawhero123 351]

Thanks for the calculator. That's helps me wrap my pea brain around the concept much better. 

Mark. 

[wallfish 17,000]

Trust me Mark, all that stuff looked like Chinese writing to me until I saw the little boxes to enter the info.

Just happened to do a bunch of research for building a backhoe. Never worked with hydraulics before and didn't want to end up a statistic or be the first guy on my block to loose a finger while playing with his lawn mower. (although I came close a couple of times) One of the first things I saw was hydraulic accidents which you can google pics for. NOT PRETTY. Never check for leaks with your hand when there's that kind of fluid pressure involved!

Here's a good source for hydraulic parts

http://www.surpluscenter.com/Hydraulics/

Edited November 22, 2016 by wallfish

[squonk 41,135]

7 hours ago, wallfish said:

No problem!

 

Can you please explain why they build electronic stuff with that magic smoke? Every time it gets out, nothing works again!

It's called "Letting the Genie out of the Bottle"! 

[Hacksawhero123 351]

 It is somewhat fantastic to watch the genie escape from a 600 hp motor. 

Mark

[R. L. Addison 299]

I used a stock c160 cylinder when I put my rear hydraulics on my c141 in 91 or 92. It will need a float position to the rear cylinder

("D" series valve will work) or chain otherwise the down pressure will drive you nuts. I bought an identical valve to the one on my Ark

loader as I could find nothing else I thought would do the job. (Before internet and "D" valves were affordable) I love the setup for all

my projects with this particular tractor, although if I do this on my other unit I think I will like the Omco valve better.

 

Ron Addison dunngawn@hotmasil.com