Rear hydraulics Jinma 354- top n tilt

[benqqu]

First post here on the forum, i ve been lurking around and using the search function alot.
My tractor: Jinma 354 with separate hydraulic pump for steering, ZL-30 FEL with block type valve and then half remotes in the rear.
Im going to install hydraulic top and sidelinks and would like to make sure a couple of issues (that remain unclear after reading the topics on the forum and info on hydraulics)

1) Im planning to cut the connection between the loader valve high pressure port and the 3-point lever. The loader valve does not seem to have a tank return line- do i need one for the new valve if i connect the power beyond port to the 3-point valve?That is is the tank return line necessary if you have an open center valve downstream from the valve in question?

2) I would need a single acting remote for the dump trailer- and have a spool valve block with only double acting valves. Does it work if i connect one of the valves so that port A is pressure to the trailer and connect port B to a tank line. Does this result (as i have understood it) in the valve actually having same functionality as a single-acting valve? ( i have not been able to find a single- acting spool to my valve)

The tractor is used on my small farm on the south coast of Finland mainly for snow clearing and small-scale forest duty. The tilt function seems useful when clearing very uneven forest roads from snow

I would be very grateful for a confirmation if i have understood/misunderstood these details of hydraulics.

[mrmikey]

Hey Benqqu, welcome aboard.
On question numer one I don't quite understand. I can't see how the fel valve would work if there's no return port.
Does the pressure line go from the pump to the fel valve which has a power beyond plug which feeds the three point valve and then to tank? The oil from the pump has to go to tank somhow
I think (if I understand correctly) you plan on adding a power beyond valve into the three point valve to feed the top and sidelinks?. If so, that would work, a bit unconventional but it would work.
You need a line to tank somewhere so the return oil from the cylinders will return to tank.
Question number 2 that would work no problem.....Mike

[benqqu]

Mrmikey, thanks. It seems that the FEL-valve is connected exactly as you mention, pump to FEL-valve, power beyond port to 3-point and then from 3-point to tank. No tank line from the FEL-valve directly. Im thinking of cutting the high pressure line between the FEl-valve and the 3-point valve, and installing a new valve in between so that the pipe from the FeL-valve goes to the inlet, and the power beyond connection of the new valve would feed the 3-point valve. Because the FEL-valve dont have a tank line im wondering if i need to connect a tank line to the new valve either, or does the returning oil from the new valve go through the power beyond port and 3-point valve to the tank?

[mrmikey]

There are two types of power beyond, some have a separate return port but the majority are as you described, thru the valve power beyond port.
All the power beyond plug does is prevent the pressurizing of the return ports on the valve.
If you attempt to hook up another valve to the return port without the plug, it'll blow the seals out when the downstream valve becomes pressurized

Because the FEL-valve dont have a tank line

It does, it's thru the next valve in the circuit.

.....does the returning oil from the new valve go through the power beyond port and 3-point valve to the tank?

Yep, when you think about it, the oil from the valve has to go somewhere so there has to be a connection to tank somewhere.....Mike

[benqqu]

I figured out that the pipe to the 3-point valve could be a nice place to tap into. I marked in the picture with 2 yellow lines where im planning to remove a couple of inches of pipe and connecting 2 hoses with L connectors. One to the inlet of the new valve, the other from the power beyond port of the new valve to the inlet of the 3-point valve. I figure i get a very clean install with minimum amount of hydraulic hoses with this solution?
Got hold of a hydraulic toplink finally today- a friend will bring it from Germany in a couple of weeks time. I was not able to find a short enough toplink locally

[benqqu]

Now with the picture

Attachments:

[bradblazer]

Welcome Benqqu,
Technically your loader should have a separate return line but if it has worked fine so far it should be okay. You just need to avoid cumulative pressure build-up which could occur if you operate the loader and another downstream valve such as the 3ph or new valve AT THE SAME TIME.

I recommend using a power beyond valve with separate return to tank for the new remotes.

The spot where you want to tap in is fine. How do you plan to attach fittings to the tubing? It looks like Swagelock makes compression fittings with a sufficient pressure rating.
www.swagelok.com/downloads/WebCatalogs/EN/MS-01-140.pdf
I welded a fitting to mine at that location for a power beyond loop to my backhoe. (pay no attention to the nut I forgot to remove before welding)

Here is a picture of my return line. I added a 10um filter. The reservoir has a tapped fitting in the lower right rear corner on my Kama. Basically it's the hydraulic drain fitting.

p.s. there is a problem with photobucket - the thumbnail code generator doesn't work

[benqqu]

Thanks for the tip and the pictures. Based on comments on the forum i will probably also upgrade the loader valve. Probably smart to plan the system so that there is return lines from both valves(new loader valve and top n tilt valve). I will have to investigate into the connection to the 3 point valve - it would not be nice to have a high pressure hydraulic leak just inches away from your leg

[nuno]

Hello Benqqu,

don't know if the ZL-30 Loader have the same Loader Valve as the ZL-20 Loader but i replace my Loader Valve last year an in my opinion, this is the best Upgrade you can do on the ZL-20 Loader.

Don't know if this can be helpfull for you and your Tractor because i think the 354 is different than the 244e but i make an connection to the Hydraulik Sump for the Return Line from the PRV i have add also to the Hydraulic System like this shown in the Picture


later when i replace the Loader Valve i use an T-Connection to connect booth Return Lines ( PRV and Return Line from Loader Valve)


i have seen, you talk about your Friend will bring some Stuff from Germany.
If you are interssted i can tell you a few good Hydraulic Internet Stores in Germany they sell and shipp also to scandinavia or let me know if i can help you

[nuno]

Hey Benqqu,

take a look at your Message Box

[benqqu]

Thanks Nuno, very helpful links You sent me. I made an order for some hydraulics stuff.