My hydraulics work great except for my 3 point hitch. It will lift up and down however when I try to lift something over 300 pounds it stalls. The picture shows the valve under the seat. Is it suppose to squirt that much oil out will trying to lift a heavy load? Also my lever on the Right side of seat that controls Arms is frozen. I can't push down and twist it. PleAse help. I found thIs tractor in the weeds and have replaced pto clutch, radiator, rebuilt injection pump replaced fillets and cleaned hydraulic fluid screen. This is last thing i need to fix. Please help!!!!!!!