Max26XL Hydraulics

[vietvetharry]

I had to replace the hydraulic pump and metal pressure line going to the block. After about 5 minutes of running, I get a squealing sound from the pump area. I had that sound before the metal fluid line ruptured at the fitting which is why I replaced the pump. Do I need to vent/bleed the line or is something else going on?

 

[vietvetharry]

I'm wondering since the two pumps are in series, gear driven off the engine, if my problem might be the steering pump or the gears themself? I should also mention the 3 point is not working.

 

[LittleBill21]

sounds like your in pressure relief, do you have the hoses looped in the back? do you have a backhoe? I need to make a loop when i disconnect the backhoe so I am not dead heading the pump

 

[vietvetharry]

sounds like your in pressure relief, do you have the hoses looped in the back? do you have a backhoe? I need to make a loop when i disconnect the backhoe so I am not dead heading the pump

I had to remove the frame for the FEL due to a fracture for welding and disconnected all the hoses from the block. For the backhoe I did have those lines looped. I started the tractor yesterday and it ran quietly for 5 minutes at idle but then it developed a fairly loud squeal from the pump area. The front steering pump had quite a bit of vibration. I turned the wheels to make sure the power steering cylinder was primed. I had power steering, but the vibration continued.

 

[LittleBill21]

if you crack a line does the fluid come out? if the 3pt is not working you prolly aren't looped right, the 3pt is the last item in the line before the tank I believe.

 

[Harry in Ky]

"The block"? is that a diverter block with a spool on one side you can rotate with a screwdriver? If so, and you didn't rotate it when you removed all the loader plumbing, that's how you messed up the pump and line. You might be about to mess up another one.

 

[vietvetharry]

"The block"? is that a diverter block with a spool on one side you can rotate with a screwdriver? If so, and you didn't rotate it when you removed all the loader plumbing, that's how you messed up the pump and line. You might be about to mess up another one.

Good question, I don't recall seeing a spool that can be turned. I'll take a picture tonight and post.

 

[vietvetharry]

if you crack a line does the fluid come out? if the 3pt is not working you prolly aren't looped right, the 3pt is the last item in the line before the tank I believe.

I did crack it and fluid came out. Not sure about looping, all the flexible hoses have been removed for the FEL & backhoe.

 

[vietvetharry]

sounds like your in pressure relief, do you have the hoses looped in the back? do you have a backhoe? I need to make a loop when i disconnect the backhoe so I am not dead heading the pump

I have all the flexible hoses removed and the pressure valve in front of the seat set at the halfway point.

 

[LittleBill21]

so there are no lines hooked up at? and fluid isn't pouring out? are the filters blocked?

 

[vietvetharry]

so there are no lines hooked up at? and fluid isn't pouring out? are the filters blocked?

No flexible hoses are hooked up to the block that went to the FEL & backhoe. There are three hard metal lines that are attached to the distribution block that supply fluid to the 3 point and power steering. If I break the fitting fluid does flow.

 

[vietvetharry]

Good question, I don't recall seeing a spool that can be turned. I'll take a picture tonight and post.

The three capped outlets were where the flexible lines were connected for the FEL and backhoe. The other picture is the pump I replaced with the hard line off the bottom of the pump goes to the front connection at the pump. Any suggestions if the connections contribute to the 3 point not working?

 

[vietvetharry]

I have seen on other threads for Mahindra tractors that the wrong hydraulic filter other than an OEM one can cause problems. I did replace the filter with a Baldwin BT8488. Does anyone know if that filter would cause a problem on a Max26?

 

[Harry in Ky]

The wrong filter may cause A problem but it won't cause THIS problem. Your problem has to do with the "block". The three ports on the side had three lines connected to a loader valve? You removed those three lines and installed the three plugs we see in the photos? Do I have that right?

If that's the case, there must be some plugs inside the ports with plugs in them. Try removing the plugs and take some shots of the inside of them. Maybe that will tell us something. It seems what you've done has somehow blocked flow from the pump from going anywhere, and that's what broke the pump.

 

[doneill127]

Could not find a parts diagram for the max 26xl. Found them for the max 25 and 28xl, your hydraulic block looks similar to the 25 with the relief valve mounted on the top. The block on the 2ixl is mounted on the pump. Thinking. You might want to pull the plugs and the relief valve and make sure everything’s clean and free. Don’t believe there’s anything behind the plugs.

 

[vietvetharry]

The wrong filter may cause A problem but it won't cause THIS problem. Your problem has to do with the "block". The three ports on the side had three lines connected to a loader valve? You removed those three lines and installed the three plugs we see in the photos? Do I have that right?

If that's the case, there must be some plugs inside the ports with plugs in them. Try removing the plugs and take some shots of the inside of them. Maybe that will tell us something. It seems what you've done has somehow blocked flow from the pump from going anywhere, and that's what broke the pump.

Yes to the three plugs. I'll try to get us a picture. Thanks.

 

[vietvetharry]

Could not find a parts diagram for the max 26xl. Found them for the max 25 and 28xl, your hydraulic block looks similar to the 25 with the relief valve mounted on the top. The block on the 2ixl is mounted on the pump. Thinking. You might want to pull the plugs and the relief valve and make sure everything’s clean and free. Don’t believe there’s anything behind the plugs.
View attachment 797506View attachment 797507

Your diagram looks very similar to what I have for the Max 26XL. I seem to have fluid flow through the system, but I will pull those plugs for inspection. Thanks.

 

[vietvetharry]

I

The three capped outlets were where the flexible lines were connected for the FEL and backhoe. The other picture is the pump I replaced with the hard line off the bottom of the pump goes to the front connection at the pump. Any suggestions if the connections contribute to the 3 point not working?

I backed off the pressure relief plug on top of the block and let the tractor run for about 15 minutes. The system ran quietly and did not start the squealing as before.
Could it have been since I removed the FEL that the pressure was too high for the system? But the 3 point still does not work.
I examined the pump I replaced and it does not appear to be worn badly and spins smoothly. Maybe it didn't need to be replaced.

 

[Harry in Ky]

Backing off the relief valve probably lets whatever the pump puts out flow directly to sump, building little or no pressure. No squeal, but no work being done either.

You screwed up when you removed the loader valve and didn't get the plumbing right. You need to revisit the "block" and the three plugs. The answer is in there.

 

[doneill127]

Not sure what backing off the top relief valve plug would do as the adjustment of the relief is set by shim thickness if it’s the same as mine and with no load the valve should be closed.
Just a wild ass guess on my part, but it sounds like the relief valve is open so there’s no pressure to 3 ph. Wonder if it’s because when the loader is installed they put a plug into one of the ports, and now there’s no hose connected but the plug might still be there.