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I have a performance power 9" angle grinder,I have replaced the bearing in ?

I have replaced the bearing in the gearbox that supports the motor.Now it is running backwards on blade rotation,can anyone suggest what is wrong.It is a performance power 9" angle grinder.
Toyota joe, September 2017
If you've had to disconnect the electrics possibly either the armature connections or the field winding connections are reversed.

azadfa, September 2017