Could be the control valves. Some tractors have closed system Hyd. and others an open system. Some people that sell loaders and install do not know this and install the wrong valve. I know that a John Deere has a closed system and the wrong valve will work but not very well. The valves can be adjusted by installing something inside off them. I know that this answer is vague and not much help for you, but will give you a chance too ask some Hyd. gurus about it.