John Deere 4010 steering issues

[70allfuel 720]

I have a John Deere 4010 I recently brought back to life so far I've replaced hydraulic fluid and installed a new hy-cap main pump. My issue is the other day I pulled onto our road in 8th gear and I turned left hot the wheels straighten out cracked the throttle and the wheels went hard left with out moving steering wheel I got it straightened out somehow with out losing control then it worked fine until I backed it into the barn when I did do stealing got really tight to the left at idle. This tractor is trycycle front end and I've bled steering valve per the JD book I've put 8 hours on it since I've got it running. I'm wondering on if I need to rebuild valve or if I have a pressure issue from pump

 

[Bob]

My GUESS would be debris in the steering valve that may or may not clear itself.

 

[tim s]

It sounds like the steer valve needs rebuilt i can help you with it if you want help