Posted 12/27/2014 22:17 (#4269034 - in reply to #4268967) Subject: RE: JOHN DEERE 4020 HYDRAULICS
Shine a light into the filler tube while it's running to see if you notice any oil spraying around in the sump. There is a cover plate on the underside of the rockshaft. It has an o-ring that can blow out,our the cover itself can Crack. I had the same problem with a 4020, and this cover was cracked.
JOHN DEERE 4020 HYDRAULICS
