Inspect the cord entry point for breaks; check the length of the carbon brushes. Lack of lubrication or debris build-up
| Symptom | Manual Solution | Part Reference | | :--- | :--- | :--- | | | Hydraulic oil low or piston o-ring failed. Requires Hilti service center repair. | Section 8.4 | | Green LED flashing | Service indicator: Carbon brushes worn to 40% life. Replacement needed (Part #214471). | Section 10.2 | | Chisel falls out of chuck | TE-Y locking sleeve worn or dust ingress. Clean with Hilti grease (special lubricant, not standard grease). | Section 6.1 | | Excessive vibration | Broken internal spring in AVR system. Stop use immediately. | Safety Alert p.12 | hilti te 55 manual exclusive
: Combines rotation with high-impact percussion for drilling into hard masonry. Inspect the cord entry point for breaks; check
Pull back the chuck sleeve firmly; tap the bit lightly with a rubber mallet while pulling. Overloading or blocked vents | Section 8