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Old 04-04-2013, 12:54 PM
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Help with hydraulic system

I'm working on a lift table. Like the ones doctors have. The problem it's having is that when it goes up it is jerky, and when it goes down the fluid comes out of the fill/breather cap and is very foamy. It's not over filled. I'm thinking the pump is just shot, it's pretty old. Anyone have any ideas of what it could be? I'm stumped
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Old 04-04-2013, 01:48 PM
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Fluid is full and it's the right fluid? Do you have a Flowmeter to check Pressures/GPM? Is/are the Cylinder(s) leaking externally/internally? (feel the cylinder to see if it's warm to check for internal leak-

Have you checked the Spool to be certain you don't have a shredded o-ring?
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Old 04-04-2013, 06:24 PM
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Did you recently add the oil? Are you getting a whistle type sound also? Could simply be that there is still air in the system that needs time to purge out (hence the foam?)

PatM
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Old 04-04-2013, 06:53 PM
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I seriously have no idea. I gave up on it, but thanks for the responses.
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Old 04-04-2013, 08:47 PM
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What PatM said....there is air in the system and at times it is a bear to remove, trying as hard as you might. Sort of like having air in a brake system.
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