580sk hissing noise while swinging boom

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Posted by john snell on Saturday, November 03, 2007:

1994 580sk,when i swing the boom either way i hear a hissing type noise.changed hyd fluid and filter,swing relief valve checked o.k.it seems loadest at loader valve so put in new main reief valve but did not help.swing cylinders seem strong.took hose off end of cylinders and tried to force fluid by piston but neither cyl leaked any fluid.boom swing does`t seem as fast as it shoud be.flow meter test shows 86%for pump.machine has 4600 hrs. it has been this way for over a year.still digs good.any ideas would be appricated.

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