[brorfusk]

how much hydraulic pressure is a 68 H3 supposed to have available at the quick couplers?
and is there any way i can adjust it?

I have been building a front 3 pt. hitch, but i am not getting the lifting power that i expected.
My calculations say that i have some where around 20 bar or so available and i believe that it is far from what it is designed to operate with

 

[Yooper75]

Here's the PDF manual for the Sundstrand 15 and it gives you pressures and GPM.

http://www.sauer-danfoss.com/stellent/groups/publications/documents/product_literature/bln-9646.pdf

 

[brorfusk]

Thank you, i found those data but mine is a 68 so it's a different transmission.


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[1969140]

The early 140s are supposed to have about 500 psi (34.4 bar). I'm quite sure there is an implement relief valve on the hydro somewhere, just not sure where it is. The spring in there could be weak or broken causing your lower pressures, but they never were designed for high pressure.

 

[brorfusk]

Perfect ;-) thank you that is just what i needed.
Guess i will have to ad a second ydraulic ram then, because i have calculated with 800 psi :-( And i would hate to turn the pressure up and then have something break in the hydro unit

 

[UrbanTractor]

The early 140s are supposed to have about 500 psi (34.4 bar). I'm quite sure there is an implement relief valve on the hydro somewhere, just not sure where it is. The spring in there could be weak or broken causing your lower pressures, but they never were designed for high pressure.

Good info. The IRV is located on top of the hydro, between the free-wheeling valves. The later 140s were the same psi as the earlier versions, i.e. the IRV is set at 500 psi +/- 50 psi.

Perfect ;-) thank you that is just what i needed.
Guess i will have to ad a second ydraulic ram then, because i have calculated with 800 psi :-( And i would hate to turn the pressure up and then have something break in the hydro unit

Let us know how this turns out. I really like your front 3PH. :thThumbsU

 

[Diesel332]

What will you use it for?

 

[TUDOR]

A larger diameter cylinder will do as well.

 

[stevevdg]

I built a home made " Johnny Bucket" style scoop for my 300 some years ago. I installed a shim kit from J.D. to boost the hyd. pressure. I think the stock pressure was something like 600 psi, and I took it up to around 900 psi. No problems so far, knock on wood.

 

[brorfusk]

It will mainly be used for a broom, sweeping the sidewalks from snow. It's way way overkill for my needs, but as long as it's fun :-D right ;-)
Build in progress

l



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[brorfusk]

A larger diameter cylinder will do as well.

Well i had 2 smaller cylinders laying on the shelf, so i might as well save a little money on that part


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[UrbanTractor]

I built a home made " Johnny Bucket" style scoop for my 300 some years ago. I installed a shim kit from J.D. to boost the hyd. pressure. I think the stock pressure was something like 600 psi, and I took it up to around 900 psi. No problems so far, knock on wood.

stevedg,

Was that a JD 140 that you shimmed, or another model? If a 140, what model year? Thanks.

 

[UrbanTractor]

It will mainly be used for a broom, sweeping the sidewalks from snow. It's way way overkill for my needs, but as long as it's fun :-D right ;-)
Build in progress
View attachment 433682 l

How do you plan to get power to the broom? Belts and a mule drive?

 

[brorfusk]

Hydraulic drive ;-) this vinter i will have e self powered hydraulic station on the rear of the tractor. But next winter it will hopefully have the pump mounted instead of the pto clutch, but i dont have the time this year


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[PA318Guy]

Looks like an interesting build! I really envy you guys with welding skills!

 

[TUDOR]

Well i had 2 smaller cylinders laying on the shelf, so i might as well save a little money on that part

Maybe. That depends on how much smaller and how much force you need. Since what you have does not work, there is insufficient data available to determine what will work. With highly leveraged forces, pivot friction becomes an ever more important part of the equation with force increase.

What are the cylinder sizes available?

 

[brorfusk]

I now have 2 cylinders on it, and it works perfect now :fing32:
I know all about how to calculate the hydraulics, but i think the biggest mistake was made when i assumed i had 65 bar and not only 34, if even that much here 45 years later :dunno:
I also should have measured the cylinders instead of guessing the size, I calculated with 40 mm pistons, and they are only 35 mm.

So all in all now it works perfect, and only costs me a couple of hours ekstra
If I were to buy 1 bigger cylinder here, it would cost me some where around 300 dollars :-( so using the ones i allready had was the only option

 

[TUDOR]

Ouch! Cylinders are kind of pricey on that side of the pond.

 

[brorfusk]

Wow i just checked eBay. It is actually cheaper buying cylinders in the USA and have them shipped over here :-O


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[brorfusk]

I got the 3 pt. done, ready for sand blasting and paint.
I also got some work done on the broom
So here are some more pictures

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