Hilti TE 12-S Instruction Manual

The Hilti TE 12-S may slip or stop while drilling in plywood due to several possible reasons:

1. Worn or Damaged Chuck – If the chuck is worn out or not gripping the drill bit properly, the bit may slip during operation.
2. Incorrect Drill Bit – Using a dull or inappropriate bit for plywood can cause excessive resistance, leading to slippage or stoppage.
3. Insufficient Pressure – Applying too little pressure may cause the drill to stop or slip instead of cutting efficiently.
4. Overloading or Overheating – Continuous use without breaks can overheat the tool, triggering safety mechanisms that stop operation.
5. Slipping Clutch Activation – The internal safety clutch may engage if excessive resistance is detected, stopping rotation to prevent damage.
6. Electrical or Motor Issues – A failing motor, worn brushes, or power supply issues can cause intermittent stopping.
7. Dust or Debris Buildup – Accumulated dust inside the chuck or motor can reduce performance and cause slipping.

To fix the issue, check the chuck for wear, use a sharp wood bit, apply steady pressure, avoid overheating, and ensure the tool is in good working condition.

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The Hilti TE 12-S is described as a hammer drill, which means it has a hammer function in addition to drilling.

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