Pump/ Motor removal

Removed pump and motor housing, working on removing the motor to get to the seals etc; behind the impeller , motor feels pretty locked on, already removed the disk mount and now working on getting the motor broke free. thanks,

I purchased a 8535760 pump motor assembly – how do I remove the old motor. It looks like it just twists off but it is on very tight. What is the recommended way to get the old motor off?