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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Hydraulic cylinders leake down

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dick

09-06-2003 16:41:03




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I have Backhoe on small tractor had for about 20 years mfg, by brantly Mfg. co.been used a lot.Over the yrs, almost all cylinders leake down none are leaking fluid.Is this problem in cylinder or control valves, any help will be appreciated..Thanks Dick




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Charlie

09-07-2003 08:03:59




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 Re: Hydraulic cylinders leake down in reply to dick, 09-06-2003 16:41:03  
I remember replacing piston packings, which can be a lot of work, on my dozer only to find that the problem was an O'ring in the valve spool. I would invest half an hour or so to change the O rings in the valve before messing with the cylinder. If the cylinder isn't leaking, that means the rod seals are OK. These often fail before the piston seals because they have more exposure to dirt. So the cylinder might be fine.

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Bernie in MA

09-06-2003 18:25:08




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 Re: Hydraulic cylinders leake down in reply to dick, 09-06-2003 16:41:03  
I have a JD420 crawler and the blade was sinking down fast every time you lifted it. The cup was ripped on one cylinder. I found it by taking an old push-bottom oil can (empty) and holding the tip against each cylinder with the big end against my ear while the blade was sinking down. I could hear the oil gurgling past the cup. It might not work on slow seepage. HTH



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AJ

09-06-2003 17:30:19




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 Re: Hydraulic cylinders leake down in reply to dick, 09-06-2003 16:41:03  
I would guess that the oil is bypassing the piston inside the cylinder due to the seals been worn,with the equipment on the ground you can check the suspect cylinder by pushing the rod to the end of it stroke,stop the engine and release any pressure by moving the levers,take off the pipe nearest the rod end and blank it,start the engine and push the rod out again,if you have continuous flow of oil coming out of the nipple on the cylinder when you move the lever the oil is bypassing the piston and the seals need replacing,(if your boom cylinder lifts the boom by retracting take the pin out of the rod eye,retract the rod and remove the pipe from the bottom end and to test retract it again)When you work on hydraulics leave all the equipment on the ground so it can't fall on you should you loosen a pipe that is holding something up. AJ

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