My 45 will not keep plww from falling

Was plowing yesterday with the 3-16  on my 45, everything worked great. I went to another field, and couldn't keep the plow from going down. The only way I could keep it up was to have the lever all the way up, but the hydraulic was running.  What adjustments do I need to do? Thank you.

   DrAllis, I have to disagree. It should hold the plow up at the detent position.

   My 45 has a detent when set for traction booster ?

This might help.

I just want to state the obvious, have you checked the fluid level ?

Listen to DrAllis, he is telling it like it is.

You only THINK you have a detent when set for TB...NO WAY!Absolutely no hold positon in traction booster setting and travel requires lever all the way up!The Dr is correct.

Even when my lever is all the way up (i.e. traveling down the road), the lift arms have a tendency to drop down after a minute or so.  I then have to slow down, lower plow, and then raise it all the way back up.  On long trips, I just use cylinder stops on the lift rams to keep the arms from dropping. 

Its realy not all as complicated as some make of it. The Dr is correct in that when set for drawbar control you dont have a hold position in the technical sense. Why? Because the hold valve is connected to the lift lowering section of the pump ONLY.  The drawbar control or traction booster section as it is reffered to in the manuals is run by the last plunger on the pump and it is not internaly plumbed to the hold valve, thus it works independantly of it. However, by fiddleing with the lift lower lever a person can achieive some semblance of "hold". What is happening is you are balancing the volume of traction booster section pumping against the hold valve dumping. Have you noticed that your hitches raise a lot faster in the drawbar control mode than when in hold?? Why? because you have another pump section working when so set. The detent is a seperate deal not linked hydraulicaly to the pump or valve. It's just a mechanical stopping point for the lever, that's it. Look at two disks you lock together or seperate with crew "B" The outside disk moves with the lift lower lever. the inside one is the detent, that simple. So it is possibe to have a detent in the lift lower lever while set for drawbar control but dont confuse that with a hold, its nothing of the sort. Now If the linkage is set just so-so, and the detent is at the balance point I spoke of earlier it might kind of hold there but I wouldnt want to make my living getting them so set, LOL. Your drawbar control cannot work correctly with the detent working period, it just isnt possible.

Hope this has helped and not added to the confusion. Its a whole lot eaier to show someone how the external adjustents affect the action of the hitch than to write them out.