Getting close on cylinder specs

[PaulT]

Ok,

I spoke with Kevin at <A target="_blank" HREF=http://www.princedirect.com>princedirect</A> yesterday, and he pointed me to the Wizard line of cyclinders. They make cylinders with the approx. right retracted length, and the right stroke, in bore sizes 1.5, 1.75, 2, and up.

My first question for TBNers is, is a bore of 1.5 big enough for a top link/side link? the rod diam is .75. I would like to get the smallest bore that would work.

Next, as someone already pointed out in aonther post, they have good prices on the LVR/LVT 2 spool valves with joysticks. They seem to be small enough for my use, but I really like the cessna 3 spool valve thats maybe even a bit smaller, but pretty pricey (about $240 + shipping from Surplus). I THINK I want 3 valves, if I go to all this trouble, just in case. Do you think its overkill? Is 2 really sufficient for what I want? Another thing to keep in mind is that the LVR/LVT have flost on the second spool standard. I like the idea of side-to-side float, and probably could think of other uses for it. Although Cessna valves can be configured with float, the surplus catalog doesn't show a standard valve with float, so it might raise the price even higher. What do you all think?

 

[HalseyGreen]

Paul, I went throught the same decision process on the cylinder for the side links on my JD790. What you need to do is to look at what the lifting and holding capacity of your 3 point is and the physics of the 3 point. Your choice of cylinder needs to meet the amount of weight the side down link needs to carry. I went with the 2"x8" stroke cylinders on each side and 2" x 10" stroke on the top link., but calculated that the 1.5 " cylinder would carry the load. If I recall, the 1.5" cylinders are available with shorter strokes, and for your application a 8" stoke cylinder may be too long. On the valves, I went with the 3 circuit because I was going to add cylinders to both side of my 3 point, but I also wanted the option to add a grapple or 4 in 1 bucket that I could use the 3rd circuit by disconnecting one of the down links on the 3 point. Hope this helps.

 

[jimgerken]

Hi Paul. My tractor is a 4100. I have looked at the 3pt carefully and cannot imagine how I'd ever get a cylinder to fit in place of the right-side link to get me a tilt capability. It is so small and so close to the fender and ROPS cross support, it would have to be a pretty small cylinder (even smaller than 1.5"). Since I came to this conclusion, I settled for a 2-spool valve yesterday (ordered LVR from Princedirect.com, price absolutely unbeatable). I want to operate a grapple cylinder and have started lining up parts for a top link for my boxblade.
I can see how a person might want to operate a four-in-one bucket or grapple attachment for picking up roots and limbs and logs and debris, and at the same time you'd have your boxblade on and be doing 'scaping with TNT. If my tractor was big enuf to allow use of a tilt cylinder, I would have opted for the 3-spool add-on. I cannot see how you'd ever need more than 3 spools, but there's always power beyond for additional expansion...

 

[hayden]

I agree With HalseyGreen on the weight capacity. The 1.5" bore with .75" rod yields 3500lbs capacity at 2000PSI. You'd have to factor in the geometry to figure out the weight that the cylinder will see, but I think 3500lbs is light, especially for the top link and especially if you use it for anything stressfull. Also keep in mind the shock forces when transporting an implement along a bumpy road. They hydraulic hoses will be rated at 2500PSI most likely and it would be bad to have bounce burst a hose.

Another consideration is movement speed. I have 2" cylinders on my TnT (2910) and they move a good bit faster than I'd like. I need to carefully feather them into position, even at low RPM (load GPM flow). A larger cylinder will move slower. I'd have gone bigger than 2" if there was room.