My First Grapple - Hydraulics

MarcusCarr · Mar 13, 2006

My 3 point can still be raised and lowered while the backhoe is being used. However, I need to be careful as raising the 3pt while the backhoe is attached will move the the entire backhoe unit up and down (I think). When I bought the tractor, he told me not to pull back on the level while the backhoe was attached, because it would raise the 3pt against the backhoe.

Here is the valve that I think I should be using for this project...

Valve

MadReferee · Mar 13, 2006

That valve is a little big for your tractor. But it is cheap although Surplus Center has the same valve (#9-6765) for 15% less.

If you are looking for a smaller footprint/weight valve you should check out Surplus Center. They have several that would be a better choice, but a few bucks more, depending on your tractor's implement gpm flow.

MarcusCarr · Mar 13, 2006

Thank you for the advice.

I checked Surplus Center and found this...

Valve

This one has 1/2" connections all the way around. The GPM for my tractor is nowhere near 20. I think it is around 8 GPM.

MadReferee · Mar 13, 2006

Your total gpm may be around 8 but that probably includes the power steering. Your actual is more than likely 5-6 gpm.

That valve is the same as the one from Northern only cheaper.

If your implement flow is over 5 gpm then I would go with a single spool Prince SV, open center with double acting spring return to center spool (9SV-1-X-B). It's slightly smaller than the single spool valve you found and will be easier to install and it is expandable if you decide to at a later date. Down side is it's a few bucks more.

MarcusCarr · Mar 13, 2006

Mad,

Can you add a link to the valve that you just recommended?

Thanks,
Marcus

MadReferee · Mar 13, 2006

Right here. Just choose work section B.

Surplus Center Prince SV

MarcusCarr · Mar 13, 2006

Looks handy to have the ability to expand the valve system. I noticed that this one has SAE 8 and the other has 1/2" NPT. What is the difference between the two?

MadReferee · Mar 13, 2006

1/2" NPT fittings are physically way larger than SAE 8. SAE 8 is a more appropriate fitting size for smaller valves where you will be connecting 3/8" or 1/4" hoses.

1/2" NPT has tapered threads with the outer thread diameter at .84" and the inner diameter at .53".

SAE 8 is straight 3/4"-16 with an OD of .75" and and ID of .66". The SAE fittings for the valve will use an O-ring for sealing. SAE 8 to 3/8" adapters are commonly used here.

MarcusCarr · Mar 14, 2006

Are you able to tell from the attached photo what fittings I am currently using? I this project, I will need to purchase a male and female quick connect that will match up to the quick connects shown in the photo. The black lines you see here all have "1/2" printed on them.

Thanks,
Marcus