Small Engines (Lawn Mowers, etc.): Poulan rideing mower, wont move, rideing

Question
My mower will run sometime for an hour and then slowly it starts to slow down until it wont move foward nor backward. I do what the manual said , bleed the air out of the xmsn and it runs OK for a while then it does it again.If I let it set for a while and completley cool down it does the same thing. I have no clue where to even check for fluid level nor does the manual tell you.  

Answer
Without knowing the exact model of transmission in your mower, I recommend you find an authorized Poulan service dealer and get the information on the fill level for the transmission.  If the fluid level doesn't correct the problem, the issue may be more involved and better left to a good shop to repair.  Hope this helps.