3pt hitch sometimes wont lift when in draft control????

Try doing this: when in draft control, and the lift stops raising when you have the quadrant lever all the way up, try pushing rearwards on the selector lever. If the lift begins to raise properly, your linkage is out of adjustment. There is a simple poor goat farmer fix that has worked for me. For my 640, I cut a small 2x2 about 6.75" long to slip between the front of the selector lever and the tran/hyd flange to hold the selector lever back while in draft control. Works like a charm, but of course you have to remove it whenever you need to use position control. Hopefully it'll work for you until you can get in there and fix the linkage. Keep us posted!

the lever being farther down means the tractor will let the impliment pull very heavy.. the position lever higher up means that less pressure on the top link will cause the lift arms to raise the plow... that way you can see the postion lever in draft mode to allow the tractor to automatically adjust up or down pending on load... so that when the plow started to dig in and the pressure increased the tractor would lift the plow the right amount and go on plow...

if the arms do not lift in with the position lever in the all "up" positon while in the draft mode, you probably have a worn cam follower pin and need to make a slight adjustment to compensate for the worn pin.. this adjustment requires removing the lift cover and is pretty intensive.. if they lift some times, it could be based on the feed back on the top link,,, if you are pushing or pulling on the top link, you can amplify the the lifting of the plow.. but the spring is pretty stout to be pulling against..

good luck bill