MF 2135 hydraulic setup

[MF2135tn]

 

[used red MN]

View attachment 136110

Hello MF2145tn, welcome to YT! It looks like you are posting some screen shots from some other forum that appears to have your ability to post pending registration approval. I’m going to guess that you may be confused about what is needed for you to offer further communication here. If so, below my reply, you will see a box that says “Write a reply… in sort of shaded letters. Click on the W in Write and type your information. Then hit the “Post reply” at the lower left when you are done.

 

[MF2135tn]

Yes, sorry I had typed it twice trying to get on the FB forum and decided to copy it. Then I registered here and just pasted it.
I purchased an older MF 2135, gas tractor 4 cylinder with MF loader and an off brand looks like attachment backhoe. The backhoe is welded the the undercarriage bracket of the loader.
My question is on hydraulics, there’s a front pump. It feeds both attachments.
Neither work without putting a spooler lever fully released (return mode) on the opposite attachment.
Ie to use the backhoe the loader bucket control lever has to be locked or pinned in the up position. And all backhoe controls in neutral position, Then the backhoe works.
Conversely for the loader to work the backhoes right side outrigger needs to be pinned held in release down position.
There’s got to be a better solution.
TIA

 

[MF2135tn]

It’s an odd setup but I don’t know hydraulics.
It appears a two way out valve with one input might be a solution?
But I’ve read a little about relief adjustment and that’s a mystery. But pressure has to go somewhere understandably.
Thanks

 

[Jim.ME]

Welcome to the forums.

It sounds like your machine is set up with a diverter valve to swap the hydraulics between the loader and backhoe. I believe it would likely take some major plumbing and at least one control valve replacement to properly set it up with power beyond hydraulics which would eliminate that diverter valve.

Post some pictures of your complete machine and the valves and piping to give a better idea of the set up and that might get your loader and backhoe identified.

Going forward you might want to consider posting about your MF 2135 on the brand specific Massey Harris and Massey Ferguson Forum down in the Manufacturers section here, just scroll down the index to find it.

 

[MF2135tn]

Thank you Jim.me
I will try posting as you suggested.
And get some pics thanks

 

[used red MN]

When you say the back hoe “works” does this mean you have actually dug with it or do the functions just move in trial movements? And is it the same for the loader? My understanding of how it is now connected; it is an open center system and the supply to the loader and hoe are incorrectly tee’d to supply each at the same time. To verify this if you lock the loader lever in the up position then uncurl the digger bucket of the hoe and continue holding the bucket lever when it gets to the end of its stroke does the loader then start to raise? If it does this verifies the proposed incorrect connection.
If when you operate a function and it has no affect on the opposite system it would seem to me that there is some kind of a diverter valve in the system that is not functioning properly. Or maybe I am not understanding your explanation of a “spooler (spool? )valve”?? Is there one of these spool valves both the hoe and loader controls? If so I maybe have a bit of a better understanding. The two functions are tee’d but they have installed block valves to force the fluid to flow or pressurize the opposite function.
Can you clarify?

 

[MF2135tn]

Thank you Used Red.
It’s cold a rainy/snowy here in TN or I would get those pictures up.
From what I’ve visually seen the pumps supply line come to a tee one feeds the loader controller, the other to the hoe controller.
The loader control that is pinned for the Hoe to function holds the bucket in full curled position. Don’t know if I’ll get any movement since it’s fully curled.
I will try the test you suggested when we get better weather to confirm.
Thanks again

 

[used red MN]

Don’t know if I’ll get any movement since it’s fully curled.

That answers my question, it is connected as I guessed and is confirmed by you saying the two are supplied by a tee.
You need a diverter valve like #906154 the 6th one in this linked list. Possible valve Unless the piping is 3/4”
You would either mount it at an accessible location for the operator or mount it where an extension rod would be used to change the control knob in or out.
There is a possibility that the loader valve could be capable of a series connection but for that it needs a 2nd return to the reservoir to allow discharge fluid from the spools a path back to the reservoir. Photos might give enough information to assess if that is possible.

 

[Jim.ME]

I apologize, I misread your first post and thought you were shifting a diverter valve. After re-reading it, I will say used red MN is right, you need a diverter valve in place of the Tee. Then you turn the valve one way to use the loader and the opposite way to use the backhoe. It needs to be sized for your hoses and rated for at least 3000 psi. A diverter valve would look similar to this one from Summit Hydraulics.




If you want to be able to use both without shifting a valve one of your control valves needs the "power beyond" function. There is a good chance that would require a new control valve and some plumbing rework and additions.

 

[MF2135tn]

 

[Jim.ME]

As used red MN said, you need a diverter valve in place of the tee. Or as I said you need to convert the loader valve to one with power beyond and replumb the hydraulics.

If you add a diverter valve it must always be turned to send oil to either the loader or the backhoe. If it can shut oil of to both sides, it would deadhead the pump and likely destroy the pump.

 

[BarnyardEngineering]

What you have is a simple "open center" hydraulic system, and the way it's set up, it has two paths for the oil to flow back to the reservoir. The oil will always take the path of least resistance. This is why nothing works unless one implement is "blocked off" by latching back a function of that implement. The diverter valve suggestion above is the simplest solution to the issue.

 

[MF2135tn]

Thanks for everyone’s input