Hello everybody, my name is William and I have a 2004 Cat 305 cr machine that has me scratching my head. Here is what I have done. I have checked all fuel lines pumps and everything fuel air related and it’s looking great. The machine runs really strong (Mitsubishi k4n engine) when using any functions other than boom raise and blade lowering. I originally thought it was the hydraulic pump so I replaced that but the problem remains. I have included the hydraulic schematic for some possible input on what might be causing my issue. I appreciate any help.
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