3-Point Hitch kubota b2400 hydraulic problem

[sequachiebill]

hi, last night i thought about jacking up the scrape blade and thought that i may not have jacked it up high enough. so this morning i jacked it up higher than the 3 point lift normally went. got it down and back off the jack and blocks and the 3 point lifted up almost like normal, BUT when i tried to bring the 3 point lift and scrape blade back down, it would not go back DOWN. it appears to be stuck in the up position. does this information give you anything useful to figure out my problem. also, i googled for kubota manuels for free, but all places i went to wanted $$ for them. does anybody know where you can get free manuels for these kubota tractors? thanks to all bill