Hydraulics on IH 434 problem.

[owad]

Hi there. I'm very new to hydraulics subject. I recently bought old IH 434 with loader added to it. One of previous owners modified hydraulics to hook up loader. Originally pressure line from pump went to some kind of block (see picture-lower right port that has plug on it), but it was re-directed to loader valves, from there line goes to some kind of pressure regulator( see second picture), and from that, one line feeds 3 point hitch, second line goes back to reservoir.

I have a few challenges here:
1. What this original block is there for? What does it do? Low pressure line for pump still runs through it. When I took off that lower right plug, oil would leak. Other two bottom ports on that block are just connected together with short hose loop.
2. What is purpose of pressure regulator in this set up? Do I need it.? No other attachments on this tractor.
3. Where do I hook up my post pounder's pressure side (shaver HD-10) to this system. I already learned, ( hard way) that this is open center system, but HD-10 is closed center, so I have to convert it to open center.
Any ideas ? Thanks in advance for any help.

 

[J_J]

First valve in picture is a flow control valve.

That is probably a pressure relief valve on the hyd block.

I believe the two ports connected together are the aux ports and is where you get the pressure for the post pounder.

Some valves have adapters to modify the valve between open center, closed center and PB.

So if you have one of the convertible valves, just remove the closed center plug and insert the PB adapter.

The PB from the post pounder valve should go back to the hyd block to feed the 3pt.

Is there another valve in series with the main valve?

The large return hose from the post pounder should go directly to tank.

Double check the flow using a hyd gage to analyze the ports and flow.

I don't know what your hyd pressure, but you should not be using water pipe fittings in a hyd system.

 

[J_J]

First valve in picture is a flow control valve.

That is probably a pressure relief valve on the hyd block.

The hyd block is there to distribute the fluid.

Some valves have adapters to modify the valve between open center, closed center and PB.

So if you have one of the convertible valves, just remove the closed center plug.

If you are not feeding another valve, then use the open center plug which is shallow plug.

If it is a prince valve, remove the large plug and the inside hex screw and replace with the shallow plug. The valve is now an open center valve.

If it is a Gresen valve, I believe it has a sleeve plug. Replace with an open center plug.

Is there another valve in series with the main valve?

The large return hose should go directly to tank.

 

[owad]

Thanks J.J, that clarify a lot. I read lots of your posts about converting post pounder valves to open center and I thing I understand that issue. I will check what is there when I will get back home in couple weeks. For now my question is: do I need this flow control valve? Because now 3pt is fed from it. So if I want to utilize hyd block, I move pressure hose from pump, that now goes directly to loader valves, back to right side lower port, than one bottom port will feed loader valve and post pounder valve in series, and from PB on post pounder hose to 3pt ? Will this work? I will not be using loader and post pounder at the same time.

 

[J_J]

I am not sure why the flow control is there to feed the 3pt.

Is the flow control before the hyd block or after?

If the pump goes into the flow control first, then it could vary the flow to a hyd motor, or slow downany hyd component used.

What you probably want to do is ensure the flow is going from the pump to the hyd block which has the relief valve, and then to the loader valve which probably has a relief valve, and back to the hyd block, and then to the 3p, and tank.

Is the post pounder valve a Gresen or Prince valve?

In your diagram, you should only have one hose from the loader valve to the block.

The other hose from the pump would be the suction hose directly from the tank.

The loader return/out hose has to go to tank.