Small Engines (Lawn Mowers, etc.): poulanpro54in26hphdro, spindle bearings, electrical problem

Question
my blades wont engage, i have change switch ,it turn blades and turn off wont engage again,what could the problem be dont a manual this mower. please help if you can. thanks

Answer
Is this an electrical problem?  Does the engine stop when engaging the blades ore is the pulleys and belt jammed?  

If this is an electrical issue, where the tractor dies if the blades are engaged, check the seat switch PTO switch and brake/clutch switch.

If it binds up and dies check the spindle bearings, clutch and belt.  Hope this helps.