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Hydraulic cylinders

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VaTom

03-03-2001 05:29:39




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Hello all, I browse occasionally. Run a Cat 933. Problem today is not the 933 but is a 4" hydraulic cylinder that I haven't managed to get the end off. Belongs to an antique LinkBelt crane but I figured y'all must know large cylinders. A 4' cheater bar wasn't long enough and I don't really have room for more unless I take the cylinder off the machine. Then I have a major problem holding it down. I was hesitant to heat it up but don't know what else to do. It's a stabilizer for the crane and probably was there for a reason. Actually all four need to be rebuilt. All help appreciated, thanks.

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OzDozer

03-05-2001 18:56:03




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 Re: Hydraulic cylinders in reply to VaTom, 03-03-2001 05:29:39  
VaTom - Your description of the "end of the ram" is not clear. What type of fitting is it? A picture would help greatly.



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VaTom

03-05-2001 19:27:47




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 Re: Re: Hydraulic cylinders in reply to OzDozer, 03-05-2001 18:56:03  
Hi O.D., you don't really think I'd know how to get a picture up do you? Anyway, it's the end cap that's screwed on to the cylinder, no set screw, slots for a spanner. Just stuck. I also wanted to thank everybody for their suggestions. Haven't got back to it yet but sure got a lot of helpful ideas. Anybody who hasn't, should also read what came in on the tool board next door. This is clearly not an unusual problem. Thanks again.

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OzDozer

03-07-2001 05:28:40




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 Re: Re: Re: Hydraulic cylinders in reply to VaTom, 03-05-2001 19:27:47  
Tom - Now I understand the area you are in. The other guys suggestion of heat is the only way it will come loose. You will need new seals anyway, so it doesn't matter if they cook. Look closely for a grubscrew, or even a dowel locking the thread - after years of crud buildup and many coats of paint, they can be hard to find. They are common retaining methods, although in some cases, they rely only on the fine thread and tightness to keep them together.

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VaTom

03-08-2001 05:01:02




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 Re: Re: Re: Re: Hydraulic cylinders in reply to OzDozer, 03-07-2001 05:28:40  
Thanks OD, had a friend visit yesterday. Before he got here, I used a large punch and did some serious whacking on one of the ears. It moved! Together we repositioned the cylinder, one end still attached to the crane and put a 7' cheater on the wrench. STILL didn't break the wrench! It's off and perfectly obvious why it was leaking between the sides. Turns out there was no set screw and only an Oring to seal the fine, 50 year old threads. Not even gaulled. You're right also that only the Oring would've gotten cooked. Now if I'm lucky the Cat dealer will have new seals. They're pretty strange looking. And three more to go. ;^)

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OzDozer

03-08-2001 05:49:58




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 Re: Re: Re: Re: Re: Hydraulic cylinders in reply to VaTom, 03-08-2001 05:01:02  
VaTom - Great news! And once you've got one off, the others will be easy, 'cos you know what you're up against. That must've been one d**n good wrench, to stand a 7' cheater! Good luck!



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John C.

03-04-2001 10:56:46




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 Re: Hydraulic cylinders in reply to VaTom, 03-03-2001 05:29:39  
We used to put those in hydraulic cylinder benches to break them loose. Some did have set screws that would mark up the threads. The threads are very fine and any marking would cause them to gaul and pull metal when taking them apart. Unfortunately many times the cylinder barrels had to sent out for repair or replaced. If the cap is just tight heat usually works the best for breaking it loose. After it starts to turn try lots of penetrating oil.

Good Luck

John C.

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Jonathan

03-04-2001 06:27:34




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 Re: Hydraulic cylinders in reply to VaTom, 03-03-2001 05:29:39  
make sure first that there is no other means retaining the rod guide in the barrel such as a small set screw. if you are going to be replacing seals anyway, I would heat the barrel and try that...as someone stated on the other message board, sometimes you have to get drastic and weld a bar to the front of the rod guide and use that along with a cheater pipe and heat or sledge hammer. Have seen some where the barrel had to be heated the whole duration of unscrewing the rod guide...not an easy task if you are alone..

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GEO

03-03-2001 09:19:03




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 Re: Hydraulic cylinders in reply to VaTom, 03-03-2001 05:29:39  
I have had to use heat as a last resort. If you are able to hold on to the end and not slip. I would try some other method of forcing the wrench down. I have in the past use a comalong to help break loose a stubborn cylinder. Don't like to use body weight any more than I have to. When you get older, you tend to use more brains (whats left) than brawns.

Heat will destroy any seals that is on the end of cylinder. Orings, packings and the like.

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tim

03-05-2001 18:13:55




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 Re: Re: Hydraulic cylinders in reply to GEO, 03-03-2001 09:19:03  
you might try drilling and tapping a grease zerk into the thread area and then heat it up and force some grease into things to lubricate as you try to turn. the gulling as others described is ussually the reason they turn so hard. good look this has helped me in the past.



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