cross valve problems

[Kitz]

Howdy I just got a tractor that has a cross 2 lever control valve with pb. It has both return and pb going to hyd adapter block. Is that right ? The loader is slow and jerky plus my 3 point dont operate properly. Would anyone have any thoughts and possibly a drawing of where these hoses go. It just dont seem right the way it is plumbed. Thanks in advance

 

[J_J]

Does the valve have a hose from the pump going to the IN port of the loader valve?

Check your fluid levels.

Check filters and screens if you have them.

 

[Kitz]

it has a adapter block with 3 hoses coming out with all 3 going to control valve 1 goes to in 1 goes to return 1 goes to pb. the fluid level is a little above but i havent check screen yet.

 

[oldnslo]

it has a adapter block with 3 hoses coming out with all 3 going to control valve 1 goes to in 1 goes to return 1 goes to pb. the fluid level is a little above but i havent check screen yet.

It has both return and pb going to hyd adapter block.
In the adapter block are these two lines connected or seperate? If thye are common this will not work properly.

Connections on the cross valve should be:
Inlet on valve connected to pressure port of pump.
Power beyond port connected to the inlet of the three point hitch
return or tank connected to your reservoir.

 

[J_J]

On some hyd blocks there is a return line from the hyd block to the side of the tractor and to tank.

The hyd block will also feed the 3pt.

 

[Kitz]

They are all 3 separate. The hyd block should allow the 3 point to operate shouldnt it? Wouldnt the pb be used for adding on? I had another identical tractor that only had 2 hoses coming off hyd block and it operated fine. The control valve was a different brand though

 

[J_J]

The tractor originally had 3pt only, and the relief was on the 3pt.

My relief is located on the hyd block.

Some have a cover plate so additional adapters can be added.

Some just remove plugs and screw in the proper fittings.

The hyd block is there to provide add on to the hyd system.

If you don't have the hyd block, it is just as simple to plumb from the loader valve with PB to the back for remotes.

 

[SSdoxie]

If PB and tank return are both dumping to same circuit should not have any affect on the loader, it would on 3 pt. If fluid was not needed after the FEL valve these would dump to common retrun anyway. With jerky FEL and 3pt, I think you have something else wrong not necessarily and plumbing (routing) problem.

 

[Leejohn]

After you check the screen, check the pump intake hose for sucking air. The plumbing is like one of my tractors, should be ok.

 

[Kitz]

If PB and tank return are both dumping to same circuit should not have any affect on the loader, it would on 3 pt. If fluid was not needed after the FEL valve these would dump to common retrun anyway. With jerky FEL and 3pt, I think you have something else wrong not necessarily and plumbing (routing) problem.

Would it be ok to plug pb at valve and hyd block to see if 3 point works?

 

[J_J]

All return hose should be going to tank.

If the valve has an operating PB port, it has to be connected in series for flow downstream to the 3pt.

If you block PB, you could damage the hyd system.

 

[Kitz]

Ok so i checked filter screen it is ok. Then i removed all hoses feeding the loader (4 hoses) still nothing but then i bumped boom up and down lever and the 3 point started to raise a touch jerky when going up but up. Could it be a block in the valve that cleared up? Could the jerking be because of the pb hose going back to hyd block. I would think that the pb would be for a aux valve instead of going back to block

 

[J_J]

When operating the loader, the 3pt lever should be in neutral.

If it is in the up position, the 3pt would be raised and the fluid is passing over the relief valve, and causing the loader valve to act strange.

By locking the 3pt on, you have pressurized the entire path from pump to the 3pt.

Set the 3pt to neutral or about the middle of the lever range.

If you had a gage, you could see the pressure developed by the hyd's

Since you have not blown anything yet, the fluid from the pump must be going to tank.

The fluid in an open center system should flow in a series path.

The path should be something like this. Pump to hyd block, from hyd block to loader valve, PB from loader back to hyd block,then from hyd block to 3pt. The return line from the hyd block should go to tank.

The PB going back to the hyd block, can be used for a remote valve which would be placed between the hyd block and the 3pt.

Did you do the plumbing ?

 

[Kitz]

No I just bought it online thats why im asking. My other tractor had a block with 3 outlets on the block but only 2 were being used and the other plugged. The loader valve had a hose from hyd block to valve and a hose from valve to hyd block the pb port was plugged. The plumbing is real sloppy on this one and i want to redo it to my satisfaction. I admit im just having a hard time understanding why i cant just remove the pb hose and have the 3point work as normal. Seems to me if i plugged all ports on hyd block the system would be like day one then take a hose to loader valve then return line back to block.

 

[J_J]

What you need is a good manual with a hyd schematic.

The dealer for your tractor should have the data you need.

 

[Kitz]

Here are a couple of pics of my hyd block. Why dont the 3rd hole go all the way thru? I know theres a reason what is it

 

[J_J]

It could just be a passage way for the fluid to flow from and to a certain point.

 

[Leejohn]

If you look a little closer you can see the hole that doesn't go stright thru, it's also drilled from the side and goes out the fitting that is on it. Blow air back thru that fitting and see where it comes out. I would guess it feeds the 3pt and the other one is for rear hyd.

 

[J_J]

Ok so i checked filter screen it is ok. Then i removed all hoses feeding the loader (4 hoses) still nothing but then i bumped boom up and down lever and the 3 point started to raise a touch jerky when going up but up. Could it be a block in the valve that cleared up? Could the jerking be because of the pb hose going back to hyd block. I would think that the PB would be for a aux valve instead of going back to block

This is a probably scenario.

The hyd ump probably feeds the hyd block, and with no loader installed, the fluid from the hyd block is directed to the 3pt.

Now, you install a loader, and you have to power the loader first, so the PB fluid from the hyd block is now redirected, going through the loader valve, and the return port fluid is going to a tank line, and the PB out from the loader valve goes back to the hyd block so it can feed a remote valve and the 3pt.

 

[Kitz]

Here are a couple of pics of my hyd block. Why dont the 3rd hole go all the way thru? I know theres a reason what is it View attachment 297375View attachment 297376View attachment 297377

By looking at these pics can anyone tell me which hoses from loader cv go where. Thanks