why this is not working ??

[Rockbadchild]

I bought a rootrake grappler, my tractor is really basic 2706e and I don't have the rear remote. I was given a wood splitter valve 24 GPM flow through so I took my hydraulic pump pressure and send it to my new single action valve took the out and send it back in my original tractor function valve should this work ? I tried it and everything work but it didn't hold the pressure as soon as I would let go the lever the grappler would close. I was told the valve is busted... so I order a new one, flow through single directional valve. I even tested it with air, it goes right through pull on the lever the air goes out one port, pull and the air comes out the other just how it should. Hook it up the same way as before, pressure in the IN the OUT of the single action valve back in my tractor dual valve pressure and the out is un-touch. Started the tractor everything was normal, pulled the stick to lift the tractor loader (tractor original valve) and the grappler open while I was lifting the tractor boom... the single action valve send pressure in the line without pulling or pushing on the lever why ???

 

[duffer]

Did you use a "power beyond" adapter fitting in the control valve for the FEL? If you just hooked up the grapple hose to the control valve it won't work (ask me how I know). You need a power beyond adapter fitting in the main control valve. Has something to do with the regulated flow to that hose and cuts off flow elsewhere on your internal spools.

Also check to see if your hoses aren't reversed on the valve for the grapple valve. Tough to tell from the pic, but looks like they might be.

 

[K5lwq]

Your new valve is not designed to have any real pressure on the out port. You can not feed another valve from that one.

The electric 3rd function valves you see plumbed straight to another valve is designed to handle back pressure.

You need a valve with power beyond for your grapple. Then plumb it after you loader valve.

 

[Rockbadchild]

ha I see, ok thanks ... No I haven't used a power beyond fitting .... I will check that out.

 

[Vigo327]

The original issue with the log splitter valve almost made me think you were using one with 'auto return' that would reset the log splitter when you let go of the handle, but i think that's just something the grim irony part of my brain wants to be true because it would be funny.. not that it's actually true.

I'm under the impression that just because something doesn't have a power beyond port doesn't necessarily mean it can't have pressure on its outlet, but i also don't know what other way to consistently tell. For example all those modular 'stackable' valve sets clearly can have pressure on their outlets.. there may be some other trait or term to identify that feature. But anything with a power beyond port will definitely work.

Conceivably you might be able to just reroute your plumbing so that the loader valve is first and the grapple valve is after. That may allow the hardware you already have to work. Depends on the loader valve. It may be able to deal with pressure on its outlet/'tank' port, or it might already have a power beyond port that's currently plugged and just needs the proper adapter inserted.

 

[Rockbadchild]

Conceivably you might be able to just reroute your plumbing so that the loader valve is first and the grapple valve is after. That may allow the hardware you already have to work. Depends on the loader valve. It may be able to deal with pressure on its outlet/'tank' port, or it might already have a power beyond port that's currently plugged and just needs the proper adapter inserted.

yes I have consider trying it that way but I have two out on my loader valve T2 and T3, so I have to find out from the dealer what that's all about ...

 

[Raul-02]

why this is not working ??​

The wood splitter valve is a pressure detent valve. When the return stroke is complete the pressure caused the valve to go into open mode

 

[LD1]

I believe your loader already has power beyond. Hard to tell from the picture but it looks like you have SEVEN hoses attached to the loader.

Take off the 4 going to your loader and there are 3 left connecting to the tractor.
1 is pressure in
2 is power beyond out going to feed the 3PH
3 is the tank return

Thats how most modern tractors are set up. So as far as swapping the valves and making loader first aint gonna work. Because ONLY the LAST valve in the system can be without PB.....and in your case thats the 3PH.

The danger of using a NON power beyond valve before the loader as you have it now.....is whatever pressure is required to do the loader work is seen as backpressure on the tank port of the 3rd valve. The issue that causes is most valves arent rated for that, as the tank passage inside the valve is some thin casting....and can crack the body of the new valve, or blow out seals where the spools protrude for the lever to connect. But none of that should cause the grapple to move while ALSO moving the loader unless the casting is already cracked.

But more than likely the problem is you have gotten a true open center valve....rather than the technically correct term.....a tandem center valve.

A true open center not only connects P to T port (as you found out by pressure testing) but also connects the work ports back to tank. So it dont allow load holding whereas a tandem center valve blocks the work ports.

Since you ordered a new valve....do you have paperwork, model number, or schematic of it you could post a pic and I could tell you for sure? Cause if its true open center or even a motor spool in the new valve.....and not having PB.....that combination causing backpressure will indeed cause pressure on the work ports of your 3rd function valve. And pressure on those ports will indeed open your grapple.

 

[Rockbadchild]

I believe your loader already has power beyond. Hard to tell from the picture but it looks like you have SEVEN hoses attached to the loader.

Take off the 4 going to your loader and there are 3 left connecting to the tractor.
1 is pressure in
2 is power beyond out going to feed the 3PH
3 is the tank return

Thats how most modern tractors are set up. So as far as swapping the valves and making loader first aint gonna work. Because ONLY the LAST valve in the system can be without PB.....and in your case thats the 3PH.

The danger of using a NON power beyond valve before the loader as you have it now.....is whatever pressure is required to do the loader work is seen as backpressure on the tank port of the 3rd valve. The issue that causes is most valves arent rated for that, as the tank passage inside the valve is some thin casting....and can crack the body of the new valve, or blow out seals where the spools protrude for the lever to connect. But none of that should cause the grapple to move while ALSO moving the loader unless the casting is already cracked.

But more than likely the problem is you have gotten a true open center valve....rather than the technically correct term.....a tandem center valve.

A true open center not only connects P to T port (as you found out by pressure testing) but also connects the work ports back to tank. So it dont allow load holding whereas a tandem center valve blocks the work ports.

Since you ordered a new valve....do you have paperwork, model number, or schematic of it you could post a pic and I could tell you for sure? Cause if its true open center or even a motor spool in the new valve.....and not having PB.....that combination causing backpressure will indeed cause pressure on the work ports of your 3rd function valve. And pressure on those ports will indeed open your grapple.

yes you are right I have 3 hoses P2/P3 then T2B and T3A ... that makes sense ... yes I have the paper work but wont be able to get my hand on it for week or so I know I dont not have PB on my new valve and what you are saying makes perfect sense it must be it... so my power beyond is already used ? I can't used it since its already used ? my only options is a third function kit ? or changing to a three spool directional valve with a power beyond for the 3 point hitch ?

 

[LD1]

yes you are right I have 3 hoses P2/P3 then T2B and T3A ... that makes sense ... yes I have the paper work but wont be able to get my hand on it for week or so I know I dont not have PB on my new valve and what you are saying makes perfect sense it must be it... so my power beyond is already used ? I can't used it since its already used ? my only options is a third function kit ? or changing to a three spool directional valve with a power beyond for the 3 point hitch ?

Actually you have several options.

What power beyond is.....is also called "high pressure carry-over".....so perhaps that is a more accurate description.

Valves on an open center tractor such as yours and most are all in series. So there is only ever ONE power beyond.

So when designing a system with multiple valves.....all the valves have 3 hoses. Pressure in, Power beyond (that goes to the pressure in of the next valve in the series), and a tank return.

The tank return ONLY flows oil when using the valve. So like when raising or lowering the loader.....the oil that is expelled out of the cylinders other port.....returns back through the tank passage and returns to the transmission sump of the tractor rather than being forced through all the downstream valves....

99.9% of all manual valves that I have seen are NOT rated for pressure on the tank port....but 99% of all electric valves I have see ARE rated for pressure.

Since you CANNOT make the 3rd function valve the LAST valve in the system.....because the last valve is the 3PH and usually internal to the tractor and internal passages.....your 3rd function IF you insist on a manual valve MUST be a power beyond capable valve with appropriate PB cartridge/plug.

So basically what you have will NOT work. So starting over.....here are your options:
1. Yes you can get a single 3-spool valve that replaces your existing loader valve and has the 3rd function built in. This is probably the most expensive option
2. You can get a single spool valve as you have already done.....only this time, get one that has power beyond and is tandem center
3. You can get an electric 3rd function valve.....as those dont normally need a PB as mentioned. But you have to supply it 12v through a button or rocker switch added to your joystick
4. You can go the diverter route. A diverter doesnt change any of the 3 hoses connecting your loader valve how it was originally installed. Rather you pick either curl/dump function or the lift/lower function and tie into them. Still need the 12v and a button. But it uses your existing loader valve to control the grapple by diverting one of the functions whenever button is pushed.

And I guess a 5th option would be long hoses going from rear remotes IF your tractor has rear remotes and IF the control for those remotes is ergonomically handy and in close proximity to the loader joystick