The Boom hydraulic cylinder for this backhoe is inside of the boom as shown by the blue arrow on the picture. I need to get this cylinder out since it needs to be resealed. Does anybody know if I need to completely disassemble the backhoe assemble to get the cylinder out of if I lay the boom out as shown in the pictures and then slide the cylinder out as the blue arrow shows?? Any help tricks or previous experience would be really appreciated.
4690 BACKHOE hydraulic cylinder removal
- Thread starter Curt B
- Start date
im far from expert in this but i would say stretched out disconnect end closest to operator seat then retract it. disconect other end disconnect backhoe from tractor and disconnect lines and it looks like enough room to slide it out.
but honestly im just guessing and that would be my first attempt
but honestly im just guessing and that would be my first attempt
Thanks, the tough part might be the if the hydraulic lines will come out far enough to disconnect them??
I’ve done that on my BL 4690 backhoe. You want to get the rear of the tractor high with respect to the point on the ground that the boom is going to touch when it’s fully extended. I think I raised the back of my tractor as high as I could with the outriggers and held it up with Jack stands. If you’re changing hoses like I did, be aware of that the clearance is very tight and you don’t want replacement hoses that are any larger in diameter than the original hoses that you remove. Somewhere I posted pictures that I took when I was doing it. That would either be here or at TBN. If I can find the thread I’ll post the link.
You definitely do not have to disassemble anything other than removing the pins at each end of the cylinder. If you’re just taking the cylinder out you of course have to disconnect the hoses from the cylinder. It’s been a while so I don’t remember exactly about how easy it is to disconnect their hoses in place.
Another thing is pay attention to the orientation of the cylinder. I can’t remember the reason why, but I do remember that I had to put the cylinder in twice because one time it was turned long it’s axis 180° and I couldn’t get the pin in, or there was some other reason, but it absolutely had to be removed rotated 180° and put back in and then it went in fine. So pay particular attention to the orientation when you take it out.
If you don’t get enough downward angle on the boom you can’t get the cylinder out because it hits something. For me the PITA part of it was replacing the hoses and threading them through a small opening the way the originals were.
You definitely do not have to disassemble anything other than removing the pins at each end of the cylinder. If you’re just taking the cylinder out you of course have to disconnect the hoses from the cylinder. It’s been a while so I don’t remember exactly about how easy it is to disconnect their hoses in place.
Another thing is pay attention to the orientation of the cylinder. I can’t remember the reason why, but I do remember that I had to put the cylinder in twice because one time it was turned long it’s axis 180° and I couldn’t get the pin in, or there was some other reason, but it absolutely had to be removed rotated 180° and put back in and then it went in fine. So pay particular attention to the orientation when you take it out.
If you don’t get enough downward angle on the boom you can’t get the cylinder out because it hits something. For me the PITA part of it was replacing the hoses and threading them through a small opening the way the originals were.
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The following thread at TBN has some pictures. Turns out I raised the back of the backhoe higher than the outriggers could lift it by putting 12 inch concrete blocks under the outrigger pads in order to get enough angle.
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BL4690A Backhoe Boom Cylinder/Hydraulic Hose Change
Hi, I have been using my backhoe a lot this summer. Digging and moving between 3 & 400 cubic yards of earth. Over the years I have had several hose failures. This summer I had one for the dipper cylinder fail. No big deal, but it caused me to dread the possibility of having to replace a hose...
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Very similar to my experience with the BT900. You need to extend the boom lower than it would go on level ground. Either raise the rear wheel on the side you swing the boom to, or hang it over a slope (but you still have to support the bucket end).
And note the cylinder orientation. If you get it wrong the hose connections will interfere with the boom at some extension.
I replaced one hose with one fabbed at NAPA. The nut was larger across the flats and wouldn't go through the slot in the boom until I ground it out a little.
WOW! Thank you very much for your pics and info. VERY helpful. One question... Once you have everything in the correct position to get the cylinder out do the hoses that are connected to the cylinder have enough slack and come out as you remove the cylinder?The following thread at TBN has some pictures. Turns out I raised the back of the backhoe higher than the outriggers could lift it by putting 12 inch concrete blocks under the outrigger pads in order to get enough angle.
BL4690A Backhoe Boom Cylinder/Hydraulic Hose Change
Hi, I have been using my backhoe a lot this summer. Digging and moving between 3 & 400 cubic yards of earth. Over the years I have had several hose failures. This summer I had one for the dipper cylinder fail. No big deal, but it caused me to dread the possibility of having to replace a hose...
You may have to disconnect one or both at the valve end to have enough slack. If so, mark them carefully.
I don’t remember when I disconnected or reconnected the hoses at the cylinder, but I also don’t remember it as being any kind of a big deal either. I think once you start the job it becomes obvious what you need to do.