What can I do with the Hydraulics Connections?

[fartypants]

Hi, I now have 68hrs on my Jinma 244E mostly used mowing, general tree dragging, a bit of grading and general transport around the land and feel as though I ought to start using the hydraulic connections at the rear of the tractor... but what can I use with them. I'm afraid I was not told what I can connect to them and which is the out and which is the return. I know I feel a bit of a plonker but if I don't ask I wont get to find out. I would like to get in the future a wood splitter and a tipping trailer. I have included 3 photos which I hope will help you identify what exactly I have got fitted. I have the one lever showing Raise and Lower. I am aware of a knob below my seat that controls the speed of raising and lowering the 3 point linkage. Hope that's enough to give me some advice? Cheers, Phil

 

[Diamondpilot]

Not much at all.

As you look at your first picture the one on the left is the return and simply dumps into the reservoir. The one on the right is the pressure side. You must first completely disable the 3 point lift by turning the knob clockwise between your legs as you sit on the operators seat. This reroutes the fluid from the 3 point lift cylinder to the remote on the back on your right side, the pressure remote. You now will not be able to use the 3 point and to control the fluid flow to the remotes you use the lift lever just as you would to control the 3 point.

Chris

 

[tommu56]

I'd add a loop back line so if you move valve to wrong position by accident you wont damage any thing.
It looks like it would dead head now.

There is another thread on that problem about burning up a pump or some thing.

tom

 

[fartypants]

Thanks Chris, that's more than I knew before. What equipment can I use with just these two connections?

 

[fartypants]

Thanks Tom.... I'm not sure what you are talking about re 'dead head' I'll see if I can find the thread that might explain that.

 

[Diamondpilot]

About all you can do is use things with single acting cylinders. Just like your 3 point its gravity down and pressure up. So things like a dump trailer or a hydro lift on a pull behind plow.

If you want real remotes to run things like log splitters and such check our Ronald at Ranch Hand Supply. He has a aftermarket kit that is a direct bolt on to give you true rear remotes.

By the way dead heading is when you apply hydro fluid to a line with no where to go like a cylinder and then the back pressure blows the pumps gaskets or worse yet the pumps metal body. It has happened alot. What he is suggesting is run a hose from the pressure side of the factory remotes to the return side of the remotes. That way if you do something wrong it will simply cycle the fluid back to the reservoir. Of course this is not a possibility if you do not adjust the knob below the seat and between your legs.

Chris

 

[RonMar]

You won't deadhead the system if you close the speed reg valve in front of the seat and try and lift the 3PH. This would be the same as if you tried to lift something too heavy for the 3PH to lift. The 3PH valve assembly has a safety relief valve built into it. On the top of the valve, there are two caps. The forward one with the square head is over the safety valve. It is set using washers to preload the spring. Mine came set from the factory a little too high at 3000PSI. A quick way to check the setting of the 3PH safety is to put a gauge on a QC fitting and plug it into the supply port on the right. Close the speed reg valve and try and lift the 3PH. The pressure read on the gauge is the pressure that the relief is opening at. I had to remove a washer to get my relief pressure down into a safer range. If you put a line between these two ports, your 3PH will not lift as it will send all it's flow right back to the resovoir and cannot build any pressure when you lift the 3PH control lever.

My tractor had the supply pipe like yours, but not the return. I added a return up in my filler cap to allow me some flexibility. It also allows me an easy way to filter the main hydraulic flow when I am not using the 3PH as seen in this picture. That is a Quick connect set, a buyers 11GPM return line filter from surplus center and a hose from a local shop(about $35 all totaled as a QC set came with my tractor). I just close the speed reg valve, plug this rig in and lift the 3PH control, and almost all the system flow goes thru the filter. Only the fluid used by the steering skips the filter.

This setup, like yours would allow me to put an open center valve with quick connects between those ports, much like the loader valve is placed between the pump and the steering diverter valve. lifting the 3PH control lever with the speed reg valve closed would send fluid to this new valve This would allow me to operate as many cylinders as the new valve has spools for, But, the 3PH would be disabled whenever this new rear circuit was connected, so it may not be particularly usefull. I had thought I might power a backhoe with this port and an auxilliary resovoir, but got a BH with it's own pump, so I have only used the ports to filter the fluid.

A more functional way for additional hydraulics IMO would be to plumb an open center valve in series with the existing loader valve if you need more functions, or replace the two spool loader valve with one with more spools to support more functions. This is what I did. I replaced the 2 spool valve that did not have float, with a 3 spool valve with float on the first spool. The new third spool is for a grapple or whatever else I feel like using it for...

 

[fartypants]

Ron,
Thanks, that has increased my knowledge by 1000%. There is a lot more to this than meets the eye... especially as this is the first tractor owned or ever been around. I'll wait until I need a certain piece of equipment and then take it from there. If anyone has any other comments I'd be more than happy to read them... but thanks anyway to those who have already responded. Cheers, Phil.

 

[Smalljobs]

I'm just learning as well and am planning on buying a 3PH splitter for my Jinma 284.

If I connect the splitter do I have to close off the lowering valve for 3PH to run the splitter? How can I raise the splitter off the ground or can I swap from one system to another to make it all work? If I disconnect the splitter and then open the lowering valve for 3PH can I then raise the splitter?

This is confusing...what is the purpose of the rear remotes if we must give up the 3PH lift in order to use them?

 

[RonMar]

I'm just learning as well and am planning on buying a 3PH splitter for my Jinma 284.

If I connect the splitter do I have to close off the lowering valve for 3PH to run the splitter??

Yes you must close the lowering valve. If you don't, as soon as you put a load on the splitter cylinder and start to build pressure, this pressure will reach the 3PH cylinder and try and lift it. And if the splitter lines are connected to the ports, the fluid will go thru the valves open center instead of lifting the 3PH when you raise the 3PH control lever.

How can I raise the splitter off the ground or can I swap from one system to another to make it all work? If I disconnect the splitter and then open the lowering valve for 3PH can I then raise the splitter??

You can swap back and forth like you described. Drive to where you want to split and lower the 3PH/splitter to the ground. Close the speed reg valve and connect the supply/return QC ports to the splitter open center control valve. Raise the 3PH control lever to send fluid to the splitter.

When you are done and want to move on, lower the 3PH lever to stop fluid flow to the splitter valve. Disconnect the supply QC to the splitter control valve. Open the speed reg valve and lift the 3PH/splitter off the ground.

This is confusing...what is the purpose of the rear remotes if we must give up the 3PH lift in order to use them?

Well they are not a true "remote" I believe the correct term is half remote. In fact, mine only came with the supply port. The chinglish translation in the manual alludes to this port being able to supply a single acting cylinder on a dump trailer. With the speed reg valve closed, lifting the 3PH control lever would supply and dump a hydraulic dump bed trailer. Lowering the 3PH control lever would allow the dump trailer to come back down by gravity, just like the 3PH does. With a trailer attached to the drawbar, you don't really have any use for the 3PH anyway

Here is a diagram of how my 284 hydraulic system is plummed. It only showes the supply remote, but the return remote just feeds back into the reservoir.