1900 3 POINT HITCH WON'T RAISE

[JC-jetro]

Ok checked a few things with no luck,and called messicks , they told me to turn slot on block from 10 to 2 or other way , don't think the 1900 has that to divert front to rear ,
Hers what I did , loosened high pressure line that goes in under 3 pt controls , has pressure when running , pulled plug on side of lift cylinder head while running -no oil !!, backed off screw on control valve that bolt on spool and did effect the loader performance ,screwed back in , had no effect on 3 pt., I do have a pressure gauge but at am a loss what to check with nothing at lift cyl. head.. Thanks !!! for any help, and that messick site is awesome!!

The pic below is where I put the gauge. if you removed the plug and no oil cam out then we need to go backward to see where you have any flow.



The pic below is where the relif pressure device is. On mine when I had issue with the pump I opened the plug out and turned the engine on. With plug out I had no flow. once you open it if you have oil flow then there is something wrong with the spool. if no flow than at the diverter block flow is not diverted. I don't know if you have a relief device for your loader system as well.


Pic below shows the valve and spring to adjust the pressure.



I'm thinking your issue might lie in the spool control valve. test out the relif device and let us know. I thing we might be getting close.

JC,

 

[toolhawk]

I have the Identical relief devise , will pull insides out tonight and see if I have oil flow , backed off screw on relief last night while running and it did effect loader performance. so we will see . THANKS!!!!!

 

[jinman]

Toolhawk, I still think something is allowing oil to return to the reservoir before it is being routed to the 3PH whether it be a blown seal in the 3PH control valve or somewhere else. The system pressure relief valve is adjusting overall hydraulic pressure and would effect all systems. I sincerely doubt it is related to your problem.

 

[JC-jetro]

Jim,

In my rig without a loader, hyd pump discharge is directly routed to the Relief device. There is nothing in between pump discharge and relief device on my rig. In tool hawks case there is going to be some hyd block (diverter or whatever) that sends flow to loader and or 3 point. If he takes the plug out at the relief and no flow then for sure the problem lies on the diverter/hyd block. If he has flow there (what a mess it makes) then the only thing from that point to the lift system is the lift spool valve. He needs to establish how far the flow goes and where it stops and why?

JC,

 

[jinman]

He needs to establish how far the flow goes and where it stops and why?

JC,

I could not agree with you more. I'd love to have a schematic diagram of the 1900's hydraulic system to see how flow is supposed to go with a loader attached.

EDIT: Look at the diagram below. The part # 16 in this diagram is inserted between the relief valve and the 3PH control valve. That's what taps flow/pressure off for the loader, but I see no place on it to test pressure. I think that is the diverter block.

 

[JC-jetro]

I could not agree with you more. I'd love to have a schematic diagram of the 1900's hydraulic system to see how flow is supposed to go with a loader attached.

EDIT: Look at the diagram below. The part # 16 in this diagram is inserted between the relief valve and the 3PH control valve. That's what taps flow/pressure off for the loader, but I see no place on it to test pressure. I think that is the diverter block.

Jim,

#16 is a hyd block that is between the spool valve and the relief device. The pics below is from another 1700 that I looked at. That rig did have a loader on it. in the fashion pictured below there is one relief device that works both loader and 3 point. I was trying to locate a block like that to make a rear remote for a splitter or something. I don't know if OP's loader is configured like the pics below.
If he removes the cap on the relief device and there is flow there then for sure spool got an issue or diverter block has blockage. There is remote possibility (highly unlikely) that relief check at the head is stuck wide open. it is very easy to take the diverter block and clean it up and push some compressed air in it. The o-rings in the block can be replaced by a metric o-ring from HF.

JC,


two lines out of the hyd block going to loader valve.



two lines going to loader spool valve, two going to lift and two to curl.



close up pic of the loader spool valve.

 

[toolhawk]

jinman when you say you would like schematic diagram of the 1900's hydraulic system , what more are u looking for than u posted ? that is my system ?

pulled relief valve screw out , your right WHAT A MESS!!, SHOT OUT 3PLUS FEET!!

 

[JC-jetro]

jinman when you say you would like schematic diagram of the 1900's hydraulic system , what more are u looking for than u posted ? that is my system ?

pulled relief valve screw out , your right WHAT A MESS!!, SHOT OUT 3PLUS FEET!!

Cool, we're getting closer.

Now, do you have a hyd block as I pictured on my previous post. If so, the hyd block might have a blocked port or your 3 point spool valve is blocked or diverting all flow back to diffy. If I were you and had a box of HF assorted metric 0-rings, I'd then remove the relief device, take a hyd block off, clean and blow air in it to make sure all internal ports are open. I'd think that just might do the trick. I hope you will not have do any dis assembly of lift spool valve. That would be a lot more involved and expensive.

JC,

 

[jinman]

jinman when you say you would like schematic diagram of the 1900's hydraulic system , what more are u looking for than u posted ? that is my system ?

Yes, that's the piping, but not the complete system showing the 3PH control valve internally. It really doesn't matter if you can't see or get to anything to test pressure. Knowing how it works doesn't do you any good if you can't test it. From that aspect, you are completely right that I don't need anymore than what we already have. As much as I'd like to know it, I can't do much with the info if I had it.

I'm going to suggest that if you remove that tap block as JC suggested, that you put the relief valve back on without the block so that the loader is eliminated from the circuit. If the 3PH does not then work, then you know you have to pull off your control valve to do seal replacement or repair.

 

[toolhawk]

ok i did pull spool apart, not to worry I teach machining and fabrication and repair all my own equipment,lathes , milling machines , power shears....but this is kicking my butt!!!! ok worry !! it all came apart as it should except the slotted port #21 check valve seat, it is TIGHT!!! , Will make a tool to fit slot better and get it out, everything else is clean and free ,all o rings looked good,