Siroma 204E (Jinma?) hydraulics questions

[dwk789]

Hello all,

I'm from the UK, have a small holding ~ 20 acre. I use a Siroma 204E. I have some basic questions, probably not specific to Siroma, about the hydraulics. Is this the correct forum or would I be better in the hydraulics section. I guess it sounds a stupid question but couldn't decide; Chinese tractor or hydraulics.

Thanks,

 

[RonMar]

Probably better to post questions here. Siromer looks to me like a rebadged Jinma tractor. Their hydraulics can be a little different than typically found on other machines.

What are your qustions?

 

[dwk789]

Hello Ron,
OK. The tractor was bought with a double acting spool valve. We connect a tipping trailer with a single acting cylinder to it. The trailer goes up but not down. I've thought about it and sort of understand (I think) why it won't come down. I'm hoping you can confirm that everything is working correctly and its just the wrong valve for the wrong cylinder. If this is the case its time to consider options:-
1. In the manual it explains the 'standard' set up will operate a tipping trailer. I think standard is without the double acting valve fitted. Instead it seems to operate from a valve that is used to operate the 3 point linkage. Picture of valve attached.

In the diagram I can see where I might connect (T leading to a x) but on the valve I can't see where I might connect to. I was hoping someone might have experience and be able to advise

2. Final option would be to use existing valve to go up but use a T + ball valve leading to the reservoir to go down (I'd have to figure out how to let the returning oil enter the reservoir).
Thank you,

 

[RonMar]

Where exactly is this double acting valve fitted on your tractor? Do you have a picture of that?
The first drawing you show looks like the standard 3PH control valve, and the second is a picture of it To run a single acting dump trailer cylinder off the stock system, you need an additional pipe added. In the first diagram you posted, that pipe with a quick coupling fitting is plummed into the system where the "X" is shown on that diagram. The cylinder above the X is the 3PH cylinder, and the 2 valve diagrams to the right of the cylinder represent the speed regulating valve which controls the lowering speed of the 3PH to keep you from dropping a heavy 3PH impliment too quickly. That valve is located on the front of the hydraulic reservoir right down in front of the seat and has a round knob like a water faucet on the top. Can you take a pic like the second one of the valve, but zoomed out a little and panned to the right to show the area in front of the reservoir?

My 284 has that added pipe to feed a dump trailer, and it is connected to the right side of that speed regulating valve block down in front of the seat. You can see it in this picture, it comes from a banjo fitting, runs straight up and then bends to the left in the picture which is toward the rear of the tractor.


That pipe runs back and ends at a QC fitting as seen in the next pic(sorry bout the sawdust, been running the chipper). You connect the trailer cylinder to that QC. To dump the trailer you screw that speed regulating valve in front of the seat, all the way in/closed. This prevents fluid from flowing to the 3PH like it normally would when you use the 3PH control lever. With the speed reg valve closed, and with the trailer connected, up on the 3PH control dumps the trailer and down on the 3PH control allows fluid to flow back into the reservoir, allowing the trailer to lower by gravity.

 

[dwk789]

Hello Ron,
Your last reply confirmed quite a few points for me. In regards to the schematic, there was one thing throwing me a little. I understood about the restrictor to control the return of the oil flow but not the symbol that looks like 2 triangles facing each other. In my work (pneumatics) this can represent a ball valve. So I thought I can shut the restrictor but where's the ball valve. Probably a miss-understanding on my part.
I was greately encouraged by your pictures. Your control valve looks similar to mine and I can relate to where you decribe the dump trailer feed pipe to be. This weekend I'll remove a few bits & pieces so I can get a clear view around the restrictor and take a picture. In regards to the double acting valve I'll take some more pictures this weekend also. In the mean time I have a shot of the quick release couplings (4). I think its actually to double acting valves side by side. They are positioned at the rear of the tractor in a similar position to the single quick release coupling shown in your picture.


Again, thanks for your help.

 

[RonMar]

Looks like you have two rear remotes, each a supply/return to control a double acting cylinder, each connected to a double acting spool control valve with a lever, or a joystick to control the two circuits.

If so, your dump trailer should work on the installed valve, unless it has some sort of load check internally and is too restrictive for the weight of the bed to force fluid back thru. IE the fluid has to be forced back thru, like the fluid being pushed back from the back side of a double acting cylinder...

Not sure about the dual triangle symbol, that also indicates a valve to me, but I know of no valve in the circuit between the control valve and the speed reg valve down in front of the seat.

 

[dwk789]

Hi Ron,

I'm fairly certain we have the same control valve. I took out the bolt you identified as feeding to the dump trailer and as expected it was just a blank.
So this is the plan. The 2 valves that go to the 4 quick release connectors can stay in place (not doing any harm as I can see). I'll get a pipe made up with a banjo fitting the same as yours and terminate it with a female quick release coupling that I can mount near the others (similar to yours).

In your picture it shows a solid pipe from the banjo fitting. Where does it change (assuming it does some where) to flexible?

One thing I didn't expect was the thread type on the blank. I measured it as M18 x 1.5.

Again, thanks for your help.

 

[RonMar]

SO that pic you just posted is of the speed regulating block on the front of the reservoir down in front of the seat?

M18X1.5 sounds about right, that is a typical metric banjo bolt fitting on these tractors. The pipe on mine is solid from banjo all the way to where the quick connect is attached to the pipe. It is about located where your 4 quick connects are seen in your pics. You could make a pipe and banjo, or some other type banjo adapter to get fromthat metric port to the QC connection. Once you do this, it should simply be a matter of screwing that speed reg valve closed, then the 3PH control will work the dump bed on the trailer. Also a good idea to make sure the hydraulic reservoir is topped off as the dump trailer will probably consume a lot of oil when fully extended...

Good luck

 

[J_J]

As Ron says, if you are able to extend the SA cyl, when you pull the lever the other way, if there is enough weight on the cyl, the fluid from the cyl should return through the QD to tank.

Check the breather on the cyl port if it has another port.

 

[Jimmy965]

To operate a tipping trailer with a single acting cylinder on a double acting valve:
Plug the trailer into either remote. Lift in the usual way, shut down the engine when lowering.
or
Plug the trailer into one remote. Fabricate a hose from the remaining remote back to the tank for oil return.

Dean