Posted 12/27/2014 19:57 (#4268716 - in reply to #4268682) Subject: RE: JOHN DEERE 4020 HYDRAULICS
+1. To check your driver valve remove return hose to tractor and hold in a bucket. Start tractor and open supply to driver. If oil flows through driver valve in neutral the valve will have to be converted for use with the 4020 closed center system. Hope this helps.
JOHN DEERE 4020 HYDRAULICS
