Mahindra Question and 3 pt Backhoe Hydraulic Problem

[wozDaddy]

I'm guessing this may not be just a Mahindra question, but ...........
The hydraulic manifold where the bucket hoses attach to, has 3 ports.
T, N, P I'm guessing P is for high pressure. What are the other two ??

Anyway, I tapped the P line for the backhoe pressure side. I called a Mahindra
dealer and asked what port the return line do I need to use. He said T.

Ok, All hooked up. Tractor is running (fluid level is ok) , the two stabilizing arms
work properly, but nothing else does. I noticed also that during this test, the bucket will not
do anything.

I hope this is enough info to ask for help with.
Thank you,

woz

 

[K5lwq]

I will give it a shot.

I have not looked closely at how Max 28XL is plumbed but seeing what you posted I have an idea.

You should not Tee into a power line to run another valve. The loader valve should have 7 hoses on it. 4 are your work ports for the loader. 1 is the power in line from the "P" port on the block you posted. 1 is return to tank that goes to the "T" port on the block you posted. And the last one is Power Beyond that goes to the "N" port on the block. This feeds your 3Pt hitch valve and any remote valves.

I am assuming your hoe valve will have only a power in port and a return port.

What I would do is take the power beyond line from the loader valve and go to the hoe valve. Then from the return port of the hoe valve to the "N" port in your post where the Power Beyond is now plumbed.

When you disconnect the hoe valve, you WILL have to loop the hose from the loader valve that feeds the hoe valve to the hose that goes to the "N port on the block you posted. Failure to do this will damage your system.

Basically you are just inserting the hoe valve in between your loader valve and 3pt. When the hoe is removed, everything is plumbed the way it was before you added the hoe.

I can do it all day long but am not great at explaining so hopefully you understand. Someone will correct me if I am wrong I am sure. :laughing:

 

[LouNY]

Looking at your posted picture;
N is your power beyond port that should go to feed your backhoe,
T is the tank port that is your return from your backhoe,
As has been mentioned when you remove the backhoe you should be connecting a jumper hose from the N port to the T port.
One option would be using a male connector on one hose and a female on the other and the same on your backhoe,
when disconnecting the hoe connect the tractor hoses together.

 

[wozDaddy]

Thank you for your detailed reply !!

I was following you at first, but then got lost. At this point, for me, everything has to be labeled T, N, or P.
I think I got the point, but not sure. I actually (my first try) used the N & T ports to feed the backhoe.
There was a factor, I eliminated my last attempt, and the was a hydraulics oil tank reservoir mounted on the hoe.
I think it was there to facilitate a power take off pump. Leaning the hard way and loosing a lot of oil, I removed the tank and
connected that return line directly to the tractor. Unfortunately using the P & T ports. (The manuals leave a lot to be desired).
That is why ( I think) this has been a frustrating project.

I also received a second forum reply after yours. I believe it support yours. If I have this right, I use N for thr supply (to the hoe)
and T for the return. (like I did ny first try, but the tank was in between). (not good)
The connection loop)of T & N also makes sense when the hoe is not present.

My retired background is a tool & die, mold maker and plastic injection mold design engineer.
Perhaps i'm mechanical, but ..........

Please give feedback concerning this reply.
You both have helped me understand better. ( I hope).

Thank you.

 

[wozDaddy]

Hi LouNY !

Thank you for your reply.
I just replied to K5lwq concerning his help. Please review those thoughts as they also pertain to you.

As always, thank you so much !!

woz

 

[K5lwq]

Lou is much smarter than me but I want to tell you correctly. Can you post a picture of your loader valve connections? We just need to locate the power beyond from that valve assuming you can plumb it back the way it was before you started.

Then you just have to go from loader Power Beyond port to hoe valve and from hoe valve to the hoes that was connected to the Power Beyond on your loader valve.

 

[wozDaddy]

I need to go an see if I can identify the 3 hoses (originally) coming from the loader connected to the ports.
I took a picture , but had a mother board failure compromising my PC data. Hope I had a recent backup, but should be able to figure it out.
Tomorrow will be my next chance.

Enjoy your evening.
Thank you.

 

[wozDaddy]

Good morning All,

Somehow I managed to find a good drawing description. It supports your help.
I need to re-plumb. I will post my results asap.

Thank you all for your efforts !!!View attachment MB60_ops_manual_rev_04152012.pdf

 

[K5lwq]

Good Morning. Glad you found that diagram. I still would love to see how the loader was plumbed before you started the project. However, your diagram supports my thoughts although I think the valve is different.

If I had a picture of your valve and where each hose goes I could tell you how to do it correctly. I have not had any luck finding a hydraulic schematic diagram of your tractor.

 

[wozDaddy]

Thank you K,

I'll take a picture asap.

Since my last reply, I replumbed the 3 ports back to like the sketch. (my original try)
The only difference is the oil reservoir tank removed so no feedback in to it.

Results were better because this time the loader was normally functional, but pressure at the backhoe
was barely enough to stretch the outrigger supports. Now I'm dealing with ..... why ?
After that I gave up for the day. This problem is a butt kicker for me. My thoughts now are, the pressure
from the N port is somehow regulated because there was never any need for full pressure when manufactured.
That would kind of make sense ? Now have to figure out how to fix it.
Has to be an adjustment valve somewhere.