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Tool Talk Discussion Forum

repair hydraulic cylinders

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azjohn

07-31-2005 06:27:07




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I have a front loader on my TO 30. It appears to be a homemade rig. The bucket will not stay in the air. Something somewhere is leaking fluid. No visible fluid on outside of cylinders. I was told this means the cylinders are leaking on the inside. How do I measure the cylinders to get the replacment kits for the inside rings??




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john nelson

07-31-2005 17:16:59




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  
If its a double acting cyl, one of the hoses or lines is pressure to extend and and the other is to retract, take the down retract side off and operate the bucket, if fluid comes out of the disconected fitting, the piston is leaking. If there are 2 cyls the leaking fluid may come out of the hose you disconected, meaning the other cyl piston is leaking. If no fluid is passing the piston the control valve must be at fault.
John

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slifnom

07-31-2005 16:23:03




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  
I have a international 350 utility and the fast hitch (double acting)also drifts down. Is there an easy way for testing if it is the control, or the cylinder?



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Bernie in MA

07-31-2005 12:58:58




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  
I have a JD crawler with 2 double acting cylinders on the blade. The blade kept sinking because of a bad cup leather on one cylinder. I found the bad one by emptying an oil can, the old kind that you push the bottom to force the oil out, and putting the tip against the cylinder and my ear against the bottom. I could hear the oil gurgling past the cup. You may have to get someone to shut the tractor off after you get positioned.

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Chris (WA)

07-31-2005 09:34:10




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  
Are the cylinders single or double acting? If they are single acting and not leaking externally the leak has to be in the control valve. If they are double acting you can temporarily add a manual shut off valve in line with the cylinder hoses , raise the loader and close the manual valve. If she still sinks it is a cylinder packing leak. If is stays up its the control valve.
To measure the packing you need the inside diameter of the cylinder , the diameter of the rod and the thickness of the packing. Best to take it apart and take it with to match it up when you get new parts.

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Carol Martin

07-31-2005 09:30:07




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  

here is a litte trick I used to test my loader
it was drifting down also.. raise the bucket and set it on couple of barrels or some other convenient item . once it is set on something take the pressure off the lift side and disconnect the two lines that feed the lift inlet of the cylinders. get a couple of caps to fit the lines AND Block them off. now back the tractor off the blocks and see if it stays put after it settles to its new position.. if it stays up trouble is in the control valves..

Carol

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Bill WI

07-31-2005 07:59:52




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  
How long does it stay in the air. If you aren't using an add on pump, the tractor pump system will normally drift over time.



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Jimmy King

07-31-2005 07:39:41




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  
It could be the cyl. is leaking inside, or it could be the control valve leaking by only way to fix them is replace. The cyl proabley can be repaired.



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Dick2

07-31-2005 07:04:24




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 Re: repair hydraulic cylinders in reply to azjohn, 07-31-2005 06:27:07  
It could be an internal cylinder leak - or it could be a leaking valve. You probably could devise some tests to determine where it is leaking - or just go trial-and-error and open cylinder and replace seals first; then go to the control valve if that doesn't work. Might want to pick up a book/manual on hydraulic systems for assistance.



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