Posted by bc on July 12, 2009 at 13:49:33 from (71.158.222.210):
In Reply to: Hydraulics Questions posted by Steve Lehman on July 11, 2009 at 20:19:00:
The rattling noise or what sounds like a zinging noise that vibrates the pressure line could be pump cavitation due to a partially plugged filter and/or filter screen or even a suction leak allowing air in. It is common during the winter when the fluid is cold and thick and not flowing well till it warms up.
Another source of that sound is when a valve isn't centering properly or gunk plugging somehing in the valve or return or flow divider area (if it has one) that causes the pressure to go up and constantly hit the pressure bypass valve. That constant opening and closing of the bypass could cause the zinging sound or if the bypass never closes it may just make a high pitch whine.
I wouldn't worry about the hydraulic except next time replace with the recommended type.
How long has it been since you changed the filter and cleaned the screen? Check it and post back.
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