Locking Sleeve: A spring-loaded collar that holds the bit in place.

Identify the Generation: There were minor revisions to the TE 17 over its production life. Ensure your diagram matches your specific serial number.

Cooling Fan: A plastic or metal fan sits on the armature shaft to pull air through the housing. Ensure it is free of dust buildup to prevent overheating. The Chuck and Front End (TE-C System)