The blower motor gets very hot on mygoodman heat pump

My blower motor gets hot and seems to run very slow.

OK... filter's clean.. return air vent(s) un-obstructed? Age of unit, lack of lubrication all factors to consider. Can you turn off the power and reach in and turn the blower.. and does it freewheel easily or is it a bit stiff? Does it stop when overheated... and how do you know it gets overheated?