NDDan
Guest
Might want to be sure high pressure hoses between hydro pump and motor are not rubbing on frame. Isulate or reposition if they are. Be sure nothing is grounding out cab for it needs to be completly rubber isulated. I noise is abnormal and you can get it to do it while loading hydro at various RPMs standing still you should suspect pump and it it increases with ground speed you should maybe suspect motor. Change both filters and very carefully dump out the large one to watch for and catch any iron. Would be very good time to catch a bearing failing. Good luck