NH TL100 Hydraulics

[cdcastle]

New owner of new holland 2000 TL100. Factory set of 3 rear remotes with an aftermarket KD QT6400 Front loader. previous owner installed loader and connected the loader hydraulics to one set of the rear remotes. I believe the rear remotes are CCLS type. Problem- I have to manually move the lever inside the cab back to the neutral position in order to run the loader. I can't use the the 3 point unless I move the lever out of the rear position. In other words I can't use the loader or 3 point without manually moving the lever-- which is very annoying while doing work-- (my smaller 3930 ford has live action all the time to the 3 point and the loader- without making any changes)
- I want my TL100 to work the same way. So, when looking at the TL100 I see the main hydraulic supply coming from the engine mounted pump as it goes to the back of the tractor it plumbs into a hydraulic manifold supplying oil to all the various functions-- can I disconnect this line and redirect it directly to the loader control valve ,and then send the power beyond port outlet of loader control valve back to the hydraulic manifold . This would basically make the fel loader valve see hydraulic oil first , and then the tractor gets its oil. I've read there may be a problem with the load sensing aspect ? Something about maybe needing a shuttle valve? Am I all wrong, or is there a simple way to do this.

 

[J_J]

I see your hyd system is a closed center hyd system. If this is true then the following will apply.

All valves are equal as any valve can use the flow, since the valves in a closed center hyd system are in parallel.

All of the valves could work at the same time , the total flow would divide with all valves spools.

CC valves do not use PB as the flow is stopped at the valve until the lever is moved.

If you are not using the 3pr, then the lever should be in the neutral position. BUT even if you did leave it in the full raise position, the flow would go over the relief. The other valve should still work.

 

[cdcastle]

Are you saying my 3 point should work all the time- no matter what position the lever is in? If that is so, then there is something wrong with my tractor.
I can not use the 3 point at all until I move the lever out of the neutral position- as soon as i do that I can then no longer use the loader. I can use one or other but not both. That is what I'm trying to solve- I want to be able to use either without having to manually change the lever-- I think I need to get away from using the rear remotes as the source of oil for the loader- what is the best way to do that?

 

[J_J]

I am talking about the most common CC hyd system, and your tractor goes beyond that.

I would read the owners manual from cover to cover.

You have some electronic controls on your tractor that I am not familiar with.

You may also have a mix of CC and open center valves.

http://www.cls-selfdrive.co.uk/PDFs/56.pdf

Remote valves
Type Open centre or closed centre deluxe
Max. number

 

[cdcastle]

Here are 2 photos - the aftermarket loader valve at the front , and then the factory hydraulic manifold set up at the rear.

 

[cdcastle]

If I disconnect the hyd supply coming directly from the pump ( red arrow) can I redirect it directly to the loader valve pressure in . Then send the PB port from the loader valve back to the point I disconnected the supply line ( red arrow) Currently the PB port on the loader valve is not being used capped off.

Will making this change screw up the tractor hydraulics? I believe the items in the photo are: black box- load sensing hydraulic manifold: red box - rear remotes set up; the green arrows are supply oil to the remotes: yellow arrows - are return oil from the remotes ; the blue arrows - load sensing feedback lines from the remotes?

 

[J_J]

Tell us what operating hyd system you have first.

If your tractor is a CC hyd system, All valves should be in parallel.

All valves get the same supply.

If you feed the FEL from the rear remotes, that means that you are using the remote valve as the supply, and you have to activate the remote valve to use the FEL. Note right in my opinion.

Is your FEL valve Open center or closed center. It sounds like it is open center if you have to use the remote valves to supply the fluid.

A closed center pump is usually smaller than a gear pump and is not required to run all the time.

However if you use the remote valve to supply the FEL, that means the CC pump is running constantly.

Who installed the loader valve?

I can understand how the open center loader valve will work , but how well is debatable.

Can you verify your tractor operating system, either OC or CC.

Can you verify the loader valve is OC, or CC?

You may have a convertible hyd valve and someone did not know.

 

[cdcastle]

JJ - The previous owner installed the FEL which is Open Center and is plugged into the rear remotes- The main tractor operating system is CC Load Sensing.

The FEL is using the rear remotes as the supply oil. I agree, I do not think this is the proper way to hook up the FEL. That is why I'm wanting to replumb the hydraulics . I have to move the rear remote lever to the rear most position in order to use the FEL- but I can't use the 3 point when I do this.
As soon as move the lever out of the rear position , I can then use the 3 point- but then the FEL doesn't work.
Not sure what a convertible hyd valve is?

 

[J_J]

Look at your FEL valve and see if it has PB port.

You might have said it was plugged.

A convertible valve is a hyd valve that can be converted to open center valve, open center with PB adapter or a plug to block off the PB to use it as a CC valve.

It just might have a closed center plug in it.

Here is an example of all three plugs. Page 8

http://www.princehyd.com/Portals/0/valves/LvManual.pdf

The first plug is just a plug to close the port and let the pump flow and cyl flow pass to the OUT port of the valve.

The center adapter fitting is the PB adapter to pass pump fluid downstream to the next valve.

The third plug screws into the PB port to close off all pump flow and all cyl fluid passes to the OUT port.

Is your remote valve CC valve?

 

[IHdonnie]

Found this site and topic with a google search looking for the same information.

Did the original poster have any luck with what you were trying to do?