I am working on a PC 200-8 excavator (serial # C62338) that has a very weak stick. The stick normal relief is at 150 (2130 psi) and the power relief is at 200 (2850 psi). According to my manual these figures should be 355 (5041 psi) for stick relief in economy mode and 380 (5400 psi) for power mode. Both the bucket and the arm reliefs are higher even though they are still low with normal relief at 250 (3550 psi) and power relief at 330 (4700 psi). The track reliefs are running normal at 395 (5600 psi) on both sides so the pumps have the capacity of high pressure. I am looking to up all the boom pressures but especially the stick. The main relief valves are set at 5600 psi so they are not causing a problem and we have swapped the valve block relief valves around and that has not helped. Is there a relief valve that I am missing? Why is the stick so much lower than everything else? We have tried to set all the pump pressures according to the manual and the functions operate at normal speed but lack power. Any ideas will be appreciated!