John deere 3020 remote hydraulics

Stand-by pressure should be 2250-2350 psi controlled by stroke control valve in hyd pump in frt of tractor. It is possible that pressure control valve under hood at firewall could be partially stuck blocking some pressure. one needs to check pressures to determine problem.
 
You will hear cavitation on the pump or chattering if the sump screen is plugged.

Check and set standby pressure first.
 

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