My bobcat 743 is acting very strange. When i first start it up and use it for about 10 min it runs fine and everythings works perfect, but after the 10 min it seams to be lossing lots of its power. I can hardly steer the 743 when it is on a hard surface and when i try to steer it it sounds like the hydraulic motor is growling really lound. It is especially feels like the left side is alot weeker then the right. Also when i try to lift the arms up with a load of dirt and drive forward the arms go up extramly slow or not up at all unless i stop moving and let all the hydraulic power go to the arms. I had the bobcat dealership look at my 743 and the said it was the left drive motor that was bad. Well i went out and bought a new motor and what do you know there is no difference. It is still just as bad. The only thing i can think of that can be wrong is something with the hydraulic pump. Has anyone else had this problem? I have changed the hydraulic fluid and filter. I am stumped i cant figure it out.