Mr Chris
New member
Hello All,
I have an unusual hydraulic problem. For years I have been unable to figure it out. The problem is on a 1980 John Deere 2040. What happens is I go to the field in the morning and start to mow. I run a 9' New idea moditioner. It runs good and the pto comes on strong as one could imagine. If I run all day it will continue to work without fail. Occasionaly as you would expect I have a plug up and have to shut off the pto to clear it. When I do this often the PTO will not come back on?? If it sits overnight it comes on just as strong the next day. Like I said if it plugs it will burn out the mower clutch it has so much power. So I know there is no slippage. I have rebuilt the PTO Spool, replaced all the pressure regulator springs and valve in the shift cover, replaced the surge valve the bypass valve etc. The previous owner replaced the internal transmission hydraulic pump. The wacky thing is I have put a Gauge on the test port of the cover and get the right psi with the pto engaged. If I leave that tester on and mow the psi doesn't change while running. Once I dis-engage the PTO the pressure drops off to low and the PTO is not going to engage no matter what I do. If as I said I let it sit over night the pressure comes right back the next day and is there all day unless I shut it off again. Occasionaly I have gotten it to come on by driving it in circles over some bumpy patch of field??? Is it possible that it's getting some sort of air lock??? Or is there something that may prevent hydraulic fluid from returning to the rear end?? This will also effect my breaks. The loader stays strong but the bucket will pause on the dump motion. Steering works as well. I should point out I had to rebuild the streering and I don't know where those little white O rings went. I found what I think was all the pieces in the screen. Is it possible the vent valve on top of the resivoir could do it??? I am obviously at a loss. I have been using it in this unreliable reliable way for seven years. None of the John deere mechanics in my area have a clue as to why?? Anyone ever run into such a strang issue?? Thanks Chris
I have an unusual hydraulic problem. For years I have been unable to figure it out. The problem is on a 1980 John Deere 2040. What happens is I go to the field in the morning and start to mow. I run a 9' New idea moditioner. It runs good and the pto comes on strong as one could imagine. If I run all day it will continue to work without fail. Occasionaly as you would expect I have a plug up and have to shut off the pto to clear it. When I do this often the PTO will not come back on?? If it sits overnight it comes on just as strong the next day. Like I said if it plugs it will burn out the mower clutch it has so much power. So I know there is no slippage. I have rebuilt the PTO Spool, replaced all the pressure regulator springs and valve in the shift cover, replaced the surge valve the bypass valve etc. The previous owner replaced the internal transmission hydraulic pump. The wacky thing is I have put a Gauge on the test port of the cover and get the right psi with the pto engaged. If I leave that tester on and mow the psi doesn't change while running. Once I dis-engage the PTO the pressure drops off to low and the PTO is not going to engage no matter what I do. If as I said I let it sit over night the pressure comes right back the next day and is there all day unless I shut it off again. Occasionaly I have gotten it to come on by driving it in circles over some bumpy patch of field??? Is it possible that it's getting some sort of air lock??? Or is there something that may prevent hydraulic fluid from returning to the rear end?? This will also effect my breaks. The loader stays strong but the bucket will pause on the dump motion. Steering works as well. I should point out I had to rebuild the streering and I don't know where those little white O rings went. I found what I think was all the pieces in the screen. Is it possible the vent valve on top of the resivoir could do it??? I am obviously at a loss. I have been using it in this unreliable reliable way for seven years. None of the John deere mechanics in my area have a clue as to why?? Anyone ever run into such a strang issue?? Thanks Chris
