Furukawa 735 LC slow and weak. Light on dashboard

Hello, Machine is old 97 year Furukawa 735 LC. Its too slow and too weak if done grading and needed to do three movements at one time- move boom,digging arm and bucket. Also yellow light on dashboard goes on if more power movements are done. The light on on the pictures link below is the on the right hand. Also can someone tell where are the solenoids on the hydraulic pump on this machine. There is a picture of the pump also. The problem may be with the solenoids? http://imageshack.us/g/404/bsyu.jpg/