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| Bought this 4020 syncro year ago in sad shape had to rework injection system, starter, and various other things just to get her running. Been using it for light pto work ie mower auger etc. This fall hooked it up to a shaver hyd postdriver and noticed when we raise hyd ram on driver hyd hose vibrates and hyd pump seems to cavitate . Check/ CHANGED fluid/ level, changed hyd filter cleaned sump screen, checked pressure at remote 2250, still the same. I also cranked tractor over with filter out seemed to have flow from transmission pump but unsure if it is enough. Have not taken stoke control valve out yet, but that may be the next thing I try, just seems to me that main pump is short on fluid or something is wrong with it. I keep leaning towards the transmission pump not providing enough fluid to main pump. but could be way off. TIA STAN | |
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JOHN DEERE 4020 HYDRAULICS
