Power Steering & FEL on Yanmar F16 project

[DRL]

jimmer, We all do what we have to do to get a job done, however, I would not leave it that way long or work it hard(pick up heavy loads). If you look at the specs for any hydraulic valve it will give a pressure rating, say 2500 psi, then it will give a rating for the outlet side, sometimes called back pressure. It is not uncommon for the outlet side of a valve to be limited to a couple hundred pounds. If this is the case in your valve you could be heading for blown seals.

Also when you hook 2 valves in series with out PB you can wind up with the loads adding together. Lets say you have a load in the FEL that takes 1500psi to lift, then you pick up a load with the 3pt that also takes 1500psi. You now can have 3000 psi in you FEL valve. Again, heading for blown seals.

As far as the steering priority valve goes, sounds like that is working right. Those split off a set flow in GPM, does not matter if you are moving or not. That why your hydraulics will always be slower now.

DRL

 

[jimmer2880]

Good info (as usual). Thank you.

I am ordering the PB sleeve ASAP. I had actually planned to before reading your reply, but now I just may expadite the shipping . You make a very good point on the double load.

After all of this, I guess I need to figure out how to up my GPM.

I don't really have enough room under the hood for a belt driven pump. I'd like to keep my crank free so I can run my MMM from that in the future. The rear PTO is in use. I wonder if it's possible to swap out the factory pump for a higher capacity pump? From the parts book, it looks like the shaft on the pump is a key'd shaft. What do you think the chances are that I can find a bolt-up replacement pump?

thank you again for all of your help.

 

[DRL]

I am not familiar with you tractor but it would be worth a shot.
DRL

 

[mopacman]

If your three point is operating that slow is their a chance you have the hoses to the power steering and the rest of the tractor reversed? That would put more flow to the steering than needed.........Larry

 

[DRL]

Lets see a couple close up pix of the pump.
DRL

 

[DRL]

mopacman, good thought, sure worth checking. Does sound like it would have that result.

DRL

 

[jimmer2880]

Good point guys. I'll take a close look (and snap some pics) today.

 

[MJPetersen]

Sometimes priority valves are adjustable. If that is the case maybe an adjustment is in order--or the hoses would be reversed. I was suspicious at the beginning when you said the steering was quick and the FEL slow.

Mike

 

[jimmer2880]

Sometimes priority valves are adjustable. If that is the case maybe an adjustment is in order--or the hoses would be reversed. I was suspicious at the beginning when you said the steering was quick and the FEL slow.

Mike

Unfortunately for me, this Priority valve is not adjustable. And, After double-checking, I do not have the hoses reversed.

After I get the Power Beyond sleeve installed, if everything is still slow (which, I believe it will be), I think I'm going to try removing my pressure relief from the circuit. I bought this one from surplus center.

Surplus Center Item Detail

I'm guessing that it could be bad and relief'ing too soon? I don't think thats the problem either. But, before I go buying a bigger, or an additional pump, I'd like to be certain.

It didn't come with any manuals. The way I ran the lines, was In (from the priority valve non-priority port) on the Right, Out (to the FEL feed) on the Left and Dump from the upper, horizontal port. On the body, the casting says:

<== Pressure ==>

Which, is the word Pressure between 2 arrows going away from center. To me, that tells me it's omni-directional. Correct?

I wish I had a pressure guage.

Any other ideas?

 

[DRL]

I would be guessing on the <==pressure==> also but I would have guessed the same as you, omni-directional. To check the valve just take the dump line off, and plug it, then if you have another line go from the dump port on the priority valve to a bucket, to catch the possible mess. With the engine idling and no load on the FEL or 3pt there should not be much or any oil coming out of the dump port.

Problem with this theory is if the pressure relief valve is bad your FEL would be as slow as your 3pt. But it may be worth checking.

You say you are sure about the priority line being correct. I am still leaning toward something in it. What model do you have. What is the flow rate(hope you did not say early in the thread and I just forgot). If it has a priority flow rate of say 3GPH and your tractor only flows 4GPH, that only leaves 1GPH to run the FEL and 3pt. Wait, now we're back to the FEL not being slow like the 3pt. Maybe I just shot myself in the foot.

Are you sure about the 3pt valve. Didn't you say you had to change a plug or 2 inside or something.

DRL