yanmar tractor 1700 hydraulic problem

[Colby92]

I have a yanmar 1700 diesel tractor. I was running low on hydraulic fluid. I place in 1qt of dextron 3 because i use it in my hydraulics on my wood splitter. I was pulling dirt with my box blade for about 2 hours. All of a sudden, I raised the box blade and it hung in the up position. Also when i went to let out on the clutch and the tractor wanted to bog down and shut off. Please HELP!