Johnathan
I started with the 1060 and 1443 numbers also. Multiply by 3.5" input arm on the "rock shaft", divide by 4.5" output arm. Multiply again by 7.5" lifting point on the lift arm and divide by 18" long lift arm gave me 343 and 468 lbs. So it's 125 lbs haha couldn't do the subtraction.
I've been playing with the linkages, changing lift points and lift bar trying to find a balance between power and travel. I think my best bet is to make the 3 pt rock shaft 1 to 1 and move my lift links to 7.5". 1060*7.5/18=441 lbs of lift force with the ql cylinder.
I changed the Liftbar on my 3 pt to a straight bar connected to the float link on the deck rock shaft instead of the "wing" I welded on to get more force. Math tells me it's almost doubling the force to over 400 lbs, but it still struggles at the end of the stroke to lift my tiller. Part of that is the rock shaft arm flattens out and I lose some of the mechanical advantage. I'm wondering is the 600 psi number we are using correct? How sensitive is the pump pressure to rpm, is half throttle 300 psi?
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Sorry lousy cellphone pic
A custom hydraulic cylinder eh? This sounds like a job for Jeff in PA! I'm thinking oval shape to maximize use of the space. LoL I did notice in my search you could get the ql/power king cylinder or the 82 series/jd/case/etc. I've seen the newer mower lift cylinders for sale, but not all sellers are responsive when you ask for overall dimensions.
Sam, I'll definitely post the outcomes. I'm just in the gathering stages now, there will be more questions, particularly the crash course in making hydraulic hard lines I'll need.
HaHa
Thanks guys
Bill