hydraulics and attachments on Dong Feng tractors

[RonMar]

I think that port on the FEL valve going straight up is the Power Beyond output port. I say this because it is removable and they are most always located very near the T output. The P going into a valve is always hard threaded in the body of the valve.
Please check that out.

Larry

Thanks for the hint, You could very well be right, particularly the part about it being removeable/cappable to disable the power beyond feature. The notes Jay put on his photos showed the lower port was labeled "P1". I am also used to the float spool being the first spool after the inlet. The one pic he posted of the valve shows the spool with float on the top. That first schematic diagram he posted also showed the P and T ports near one another with the P1 on the opposite end of the valve body. Of course, that schematic could have been drawn any which way for ease of drawing, but there are a lot of indicators that would lead me to believe that the top port is the inlet "P" port. I didn't note in the photos though the locaton of the relief valve cartrige. That is also typically located near the inlet port, but it is hard to tell from a single photo with the valve installed in the bracket.

 

[bluechip]

OK the quick connect that is on the tractor gets opened and becomes half of each of the two quick connects shown on the schematic, drawn with loader in place. If the Power beyond at top has a plug in it as it appears, and if a power beyond sleeve is not included, I will assume you plumb this just like a Jinma using the "two hose" method. this gives the best flow to the loader, but prevents moving the 3 point at the same instant you are lifting the loader. not a big deal. All of the flow goes to the 3 point when the loader is not being moved.

This appears to be a similar valve design as used on Koyker loaders, power in on the bottom, return on the side at the top, pb on the very top (with an added sleeve replacing that plug).

1. The half of the existing quick connect on the tractor that leads to the pump gets attached to a matching new quick connect (or replace both sides, both must ahve the same type of check valve, ball or cone or problems can happen). This quick connect will get attached to a hose that goes to the bottom of the Loader valve,

2. connection "T" on the valvel get a new hose attached and on the other end, a new quick connect that will attach to the one on the tractor you didnt use in 1 above. This should lead to the lift box on the tractor. At this point, if you have oil and everything is connected you could start the engine and try the loader valve and 3 point valve if they work, you can start on the backhoe.

3 Since you don't have a tank on the backhoe, I will assume that they intend to run it off the tractor pump and hydraulics. If I remember right, the DF uses the transmission oil for hydraluics, like Ford and John deere (filter maintenance is very important on this design) if so, this will be plenty of oil for the backhoe, but even if I am wrong here, it could work. You can choose either of the quick connects in 1 or 2 above and open it up, the side that is closest in line to the pump will go to the pressure line on the hoe and the other will attach to the return line.

The idea is that you want all the valves in series. The only place you can use a T fitting (not to be confused with the "T"port on the loader valve) is on the return line in a system that uses the power beyond. (your actual return to the resevoir is inside the lift box on the lift valve and dumps directly into the tank on the "two hose" method.

I too will add a disclaimer that I have NEVER put a loader or backhoe on a DF tractor, Never installed a Bush Hog loader (if the book you linked to is hte model you have, be carefull it seems like a LOT of loader capacity for one of these tractors) So I cant make any guarantee that the info I am posting is accurate. But if I had this in my shop, this is the way I would proceed.

Best of luck!

 

[bluechip]

By the way, there seem to be 3 spool valves on your loader, do you have a 4 in one bucket?

 

[Tractor Nubi]

Thank you all for your help. P was on the bottom of the valve (it had an arrow beside it). I pulled it off and looked at it better. I attached the P to the pump on the motor and the P1 to the other end QC. T was a low pressure relief that you mentioned and I found that a lot of the returns were into drain plugs in the system (there are a lot of them). So I attached into one of them. I powered it up and other than a few leaks (they didn't teflon tape any threads in China) it has worked very well. I am currently working on attaching the backhoe and I am down to attaching the in and the out hoses. I was able to get another two quick connects and two "t" fittings from a local supplier. Does the backhoe connect to the 'spare quick connects' that are labeled in the first schematic (off of P1 and T)? Yes I have a 4-1 bucket.
Jay

 

[bluechip]

The customary way to add the backhoe is to open the quick connect between the loader and the lift box of the tractor, In your case this should be coming out of the top of the loader valve if you are using the power beyond plug this is the pressure line leading to the lift box, the pressure line for the backhoe attaches to the pump side of that quick connect, the return line attaches to the lift box. be sure to always ahve the circuit complete before running the engine or pump failure is likely. If you attach the backhoe to the extra port on the loader, you may not be able to build any pressure. Open center hydraulics pump oil through the lines all the time without any real pressure, until a valve is moved to direct the flow against a cylinder, then pressure is developed. If you have anything that works as a "T" in the system, the pressure won't build, it will just go the other way straight to the tank. I suspect that P1 is the same as P (two ports into same cavity in the valve) and so would act like a T preventing any pressure build up if it was used.