Providing there is a constant pressure down the top link from the implement to the tractor it will control the depth. If you keep lifting the implement then there will be no pressure to the tractor. BUT, you can have a problem with the Draft Control Spring and Rocker behind the seat. If there is a lot of free-play in this then it would cause the problem that you have, there should be very little free-play in the spring (.020) a quick test is with the implement raised you should just be able to turn the spring with your hand, if it is very slack then it needs to be adjusted but often they are rusted now and difficult to do. You may be better using the plow for that job with the top link shortened a little more so the point will dig in more and provide the push on the top link and then you should be able to control it better. The top link should be 25.5" long from center of one pin hole to the other normally, but it is adjustable for instances like this. The problem with your Disk Harrow, depend on whose Disk Harrow it was, if it was a Ferguson you should be able to do it, but again the problem is that it MUST have a pressure down the Top Link to send signals to the hydraulics of what it should do. If you are trying to disk very lightly then you must be lifting the Disks to do this to just keep them off the ground, consequently you are Pulling at the top link and not pushing as you need to do to make it work. You may have been better dropping the Disks completely and setting then at a shallower angle so it would roll over the ground more it would still cut anything that it runs over, and if necessary you could use the disks as they were intended for a second pass over the ground after-wards. The tractor is quite capable of using a Disk Harrow, it is what you are trying to do that is the problem. But you can do it if you try it like I mentioned. If you still have problems with the hydraulics, email me at the address below and give me all the information again and tell me what model the Disk Harrow is and anything else that you can't do and I will send you the information how to set it and make it work as it should do....John(UK)...firstname.lastname@example.org
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