The motor is the powerhouse. In the exploded view, you’ll find:
Common Failure: Users ignore the carbon brushes until they wear down to the spring, which arcs and destroys the commutator. The diagram shows exactly how to access the brush caps without full disassembly.
Based on the official Hilti TE 17 spare parts list (document number 237862), the tool splits into seven functional groups: hilti te 17 parts diagram
Moving forward in the diagram, you encounter the mechanical transfer of power. The Gearing Group is where the high RPM of the motor is converted into the torque needed for drilling.
The schematic details the Grease Chamber, which houses the primary pinion and the main gear. For anyone attempting a repair, this section of the diagram is crucial for ordering the correct seals and gaskets. A common failure in older TE 17s is grease leakage; the parts diagram identifies the exact O-rings needed to reseal the housing, preventing the catastrophic lubrication loss that kills gears. The motor is the powerhouse
Hilti does not design tools to be disposable, but they are complex. The TE 17 has over 150 individual components. Guessing which seal or spring goes where will lead to a box of leftover screws and a dead tool.
The official parts diagram gives you:
| Symptom | Likely Cause | Diagram Reference Group | |--------|-------------|------------------------| | No hammering but motor runs | Worn piston seal | Group 4 (pneumatic) | | Tool spins but won’t drill | Stripped spur gear | Group 3 (gear train) | | Excessive sparking | Worn brushes or commutator | Group 2 (motor) | | Bit falls out of chuck | Broken locking spring | Group 5 (tool holder) | | Intermittent power | Damaged cord or switch | Group 7 (electronics) | | Oil leak from front | Torn dust seal or o-ring | Group 5 (chuck) |