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Message: <blockquote data-quote="OldMachinist" data-source="post: 50945" data-attributes="member: 437">When mine was sucking air there was no sign of a leak either. Put a pressure guage in one of the aux hydrualic connections and see what the pressure is when you engage the aux.. It should be 1400-1450 psi. This will give you some insight as to the condition of the hydraulic pump. The best way to check it would be to have a pressure and flow test done. Any good hydraulic shop or the dealer can do the test.Where is the screaming coming from? Could it be that one of more of the pivot pins have siezed from sitting.</blockquote>