580B extendahoe cylinder pin stuck

[sfchovis]

Case 580B

Need to get extendahoe cylinder seal fixed. Got disassembled to the point of removing the upper cross pin holding the cylinder in. This pin is stuck. Will not move with 10 pound sledge. What is the best way to approach this problem? Here are options that popped into my head.

1. Build bracket and put 20t jack on pin, apply pressure to try and pop loose...add heat if necessary.
2. Apply heat and pop pin with sledge.
3. Try to torch as much pin away as possible to be able to pull cylinder out, then remove pin.
4. Cut channels into side of boom to remove the cylinder through the top with pin attached. Reweld plates that were cut out.

What do you guys think? One and four are not ones I would be looking forward to doing.

Hovis

[YentnaTinker]

I have had the same problem. I was able to change the seals without pulling the cylinder because the gland nut is on the bottom end. You have to be careful but as long as you don't need to replace hoses this will work.

[xpackdeals]

i would also leave the cylinder on and fix it like that but if it must be removed i would do the heat with hammer i would be careful not to hit it to hard at first and would even consider hitting one side then the other to get it to move i wont swear to it but it think the flanges you will heat on the backhoe itself are made of cast and that could crack if you just start beating the heck out of it.I have heard of heating things like that then cooling them really quick will sometimes work but im not sure about using this on cast

[sfchovis]

The hoses don't have to be replaced but I would like to because of Murphy's law (they look a little rough). There is an extension on the cylinder that has the sleeve the pin slides through. The pin is loose on the boom but rusted in place in the sleeve. I thought I could heat that and when it expands, try and knock the pin through. I'm going to look at the service manual closer and see if the extension is actually a seperate piece that connects to the cylinder. If it is, it wouldn't bother me if it broke and I needed to replace it. I did notice that there is not a grease joint on this collar, that is why it rusted together. I do like the idea of redoing the clyinder in place but I have never done a cylinder before and don't know where to go to get the tool (spanner)to take it apart.

thanks for all your help
Hovis

[xpackdeals]

If your handy with a welder there are guys making that spanner wrench on here i am looking at making a wrench myself for my 580ck if you do some searching on here you will see some ideas i know one guy took 2 pcs of 3/8 flat steel and bolted them together on one end so it would open and close basically like needle nose pliers and on the other end he drilled holes and welded a pin in each end i think it was a 1/4 in pin.I have seen spanner wrenches on ebay that use a ratchet you might look at them. As far as pulling the pin if you do that i would heat that area where it is stuck but if you have room wedge some steel or something between the cylinder sleeve and the backhoe sleeve then try driving it out would help to avoid breaking the cylinder and i dont think that is a seperate piece its part of the cylinder.I have rebuilt cylinders in the past but not for one of these 580's but i am going to rebuild some on my 580ck i just bought and mine is also a extendahoe and that is one i will be rebuilding.The cylinders i have done in the past are a no brainer and i dont see where these will be much different one thing i did read on here was if you do it on the tractor and you can run the cylinder all the way out then just bump it back in a little this is so you dont fight the piston and rod to pull it out of the cylinder.Hope this helps

[sfchovis]

Thanks,

I believe I'll try and do it on the hoe. Seems like the simplist way. Just have to find the parts now.

Hovis