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Armature (rotor), field coil (stator), carbon brushes, cooling fan, and the trigger switch assembly.
Armature and Field Coil: These are the core electrical components. Look for burnt windings or "dead spots" on the commutator. hilti te 17 parts diagram
When a TE 17 fails, a systematic teardown guided by a schematic is the best way to diagnose the problem. Here is how to map symptoms to specific parts on your diagram. Symptom 1: The motor spins, but the tool does not hammer field coil (stator)
In any pneumatic tool, air pressure is everything. The parts diagram will highlight several critical seals: hilti te 17 parts diagram