Posted by Hugh MacKay on August 10, 2008 at 14:10:37 from (209.226.106.5):
In Reply to: Re: SMTA Hum posted by Retcol on August 10, 2008 at 09:48:41:
Retcol: The cause of a hum in a hydraulic system can often be hard to find. My first place to look would be the pressure bypass. Hums are usually on the pressure side as opposed to suction side through the filter and on to the pump. Wouldn't hurt to check the filter or screen whichever it has. I suppose any noise caused by partially cloged screen or filter could cause a hum if the flow restriction were constant. Personally I'm used to intermitant squaks from suction side.
One other matter, are you sure the seasonal disconnect completely disengaged. If that hasn't been uncoupled for a few years it might have kept turning the IPTO. Did you try the PTO? You may find it's a two man job engaging the seasonal disconnect. One at the belly lever and the other guy turning the engaged IPTO until the coupler comes in line to mesh.
Also, some seasonal disconnects have been replaced inside with a solid no disengage coupler. Just make sure moving the disconnect lever did it's thing. If it's disconnected you should be able to turn IPTO with PTO engaged and tractor not running.
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