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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

hydraulic cylinder rod nut.

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hazfun7

09-11-2005 10:51:09




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This hydraulic cylinder is off of a Yutani excavator. I have it off the machine with
The rod on my work table. Problem is the nut
that holds the piston (4or5")is tight?.Besides
dynamite how do I remove this nut?.I do not
have a socket this large? I have had heat and
a 36" wrench with a 15' cheater pipe on it
with no luck. I can see the treads they are right
Handed. Any ideas will be appreciated. Thanks Hazfun7

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hazfun7

09-12-2005 16:57:29




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 Re: hydraulic cylinder rod nut. in reply to hazfun7, 09-11-2005 10:51:09  
Hi all Got er done today. Thanks to all. What I
did was tied it to the legs of my welding table with a 5" pipe 24 'long through the eye of the cylinder. 36" pipe wrench 15'
Cheater pipe. Pulled my bobcat into shop
And set my grapple bucked down on it. Pop
it was loose!!!.The bore on this cylinder
is 5.184" it the very top one that's 20'
off the ground.(not a small machine).Just
Waiting on parts now. Again this is a great
Forum. Thanks Hazfun7

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2x4

09-11-2005 22:54:20




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 Re: hydraulic cylinder rod nut. in reply to hazfun7, 09-11-2005 10:51:09  
at the other end of the rod is the eye. Put the eye back in its hole & put its pin back. Now you have it where it cant give with you. Buy the proper size socket with breaker bar (3/4 inch)& it will come fairly easily. That is a small machine & its not really that difficult. You must replace the nut because it has plastic in the end & heat probably destroyed it. With the proper tools you wouldn't have needed heat.

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NC Wayne

09-11-2005 19:51:01




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 Re: hydraulic cylinder rod nut. in reply to hazfun7, 09-11-2005 10:51:09  
Your best bet would be to take it to one of your local dealerships. Around here about all of them have a cylinder bench to loosen the nuts, but CAT is the best, quickest, and cheapest place to go. I don't know what size the nut your dealing with is but is isn't uncommon for them to be tightened in excess of 5000 ftlbs. I'm pulling the bucket roll cyliner off a 320B CAT tomorrow to pack it and by the book the nut is tightened to 5700ftlb =/- 200 ftlb. If it were the cylinder for the dipper the nut on it is torqued over 8000 ftlbs... Whatever the torque, anything over about 2500-3000 ftlbs your never gonna get off by hand. Short of taking it somewhere and having it loosened your only choice is to cut it off but then you've still got no way to tighten it back up properly. Good luck.

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motorhead460

09-11-2005 16:22:06




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 Re: hydraulic cylinder rod nut. in reply to hazfun7, 09-11-2005 10:51:09  
Hi,make sure it hasn"t got a set screw.If you try heating it make sure you only heat the nut really quick and try loosening quickly,if the shaft gets hot it will expand also and bind up.If you can get a wrench on it to where you can beat on it with a big hammer it will loosen faster than just pulling on it.Hope this helps,Rick



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CATFIXER

09-11-2005 11:13:22




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 Re: hydraulic cylinder rod nut. in reply to hazfun7, 09-11-2005 10:51:09  
Make sure there is no setscrew in that nut stopping you from removing the nut and galling the threads and ruining the rod!It is probabably a locknut and torqued really tight.Before we bought the really expensive cylinder bench at the CAThouse I work at we would put them in a really large vice heat them if needed use a pipe wrench cheater pipe whatever it takes try blocking it somehow and use a truck,tractor or whatever it takes.maybe your local CAT house or equipment shop could remove it for you for cheap or maybe free!you might be better off that way after you repack it it can be torqued to spec.

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