I've got a 540 Bobcat that's been re-powered with a Honda 23 hp engine. Trying to use it today, and its got zip for power. The engine runs fine with no load and it will move pretty well straight ahead or straight back, but if you try to turn or lift or tilt the bucket it really boggs down. It won't even pull itself up a minor incline without nearly killing the engine. Hydraulic fluid level is good, replaced the hydaulic filter. What are the first things I should check. Thanks in advance - Scott