1995 Hitachi ex270lc hydro pump control question

My excavator seams to act like its under a huge load no matter how easy you are working it. It uses about 3-5 gallons of fuel per hour just doing light work like gathering brush. If you pick the boom up it labors the engine even with the bucket empty. I talked to a few guys who suggested to check the Solenoid that control the pump control. And to check the computer for it.

The "computer" was by passed when I bought this machine so I need to fix it. Or does anyone know of any way that I can "trick" the computer or solenoid to not make it load the pump so much?



I want to fix the machine correctly but if its a lot of money it's not in my budget right now. For now I just need to try to get it to not use so much fuel.



Any body have any insight on how the pump set up works on my machine?



Thanks

1995 Hitachi ex270lc hydro pump control question