#1 Check your brushes & brush springs - you will have to remove the switch handle completely to access both brushes
#2 Visual of the armature - is it black / burnt or does it have raised segments?
Most likely it will need an armature if it has run for any length of time with bad brushes.
The armature comes out the front of the motor housing so you need to remove the gearcase to access it.
Armature 2610003331 for Bosch Power Tool eReplacement Parts Carbon Brush Set
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