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Message: <blockquote data-quote="heatpumpproducts" data-source="post: 15715" data-attributes="member: 1332">the part that is leaking is the piston pump that controls the movement of the right hand stick.i was calling it the hydrostatic pump , but its the piston pump that sends fluid to the motors , i looked it up on messick last night.it seems to be leaking from the shaft that conects to the controle linkage for that RH- stick.looking at that , the part only rotates slowly back and forth , the seal & o-ring . don't cost very much , about how long mite it take to fix and re-adjust the lever controls .i looked at the pillow bearings for the control levers and the play in them is what seems to make the difference in the noise are these normally tight when new ? when i adjust for the noise the play is all that seems to be shifted and the HUM noise stop.i what to know if the HUM i noticed , the same RH-stick if moved ever so slitely tackes the hum away , so little that the wheels don't move . that hum is that normal when the piston pump is ingaged by the control sticks ? i only noticed it now that the instake manifold gasket has been replaced , and the center protection plate is off , to expose the controle spools .i will pay more attention today if both sides when ingaged make the same noise .i  can't tell you guys how much i enjoy this site , and all the feed back , and timely responces .THANK YOU ALL.</blockquote>