General / Other Manuals
Hilti AG 125-7SE / AG 125-8SE Angle Grinder User Guide
Quick guide for the Hilti AG 125-7SE and AG 125-8SE angle grinders, covering setup, disc mounting, operation, safety, and maintenance.
Table of contents
Quick guide from the manual
This document provides essential information for the safe and efficient operation of the Hilti AG 125-7SE and AG 125-8SE angle grinders. It covers assembly, disc mounting, operation, and maintenance. Always read the full safety instructions provided in the original manual before use.
Device Description
The AG 125-7SE and AG 125-8SE are hand-held electric angle grinders designed for cutting, grinding, and sanding metal and mineral materials without the use of water. They feature adjustable speed preselection (6 levels) and a restart interlock.
Assembly and Setup
- Side handle: Screw the side handle into one of the provided threaded bushings.
- Guard: Open the clamping lever, fit the guard onto the spindle collar, rotate to the required position, and close the lever.
- Front cover: For cutting or grinding with straight discs, snap the front cover onto the standard guard.
Operation
- Switching on: Plug in the tool, press the rear section of the on/off switch, slide it forward, and lock it.
- Cutting: Apply moderate feed pressure and do not tilt the tool. For profiles, start at the smallest cross-section.
- Rough grinding: Move the tool with an angle of 5° to 30° and moderate pressure.
- Switching off: Press the rear section of the on/off switch to release it.
Maintenance and Care
Regularly clean the air vents with a dry brush. Keep the tool, especially the grips, dry, clean, and free of oil and grease. If the tool is used frequently on conductive materials (metal, carbon fiber), maintenance intervals may need to be shortened. Only use original Hilti spare parts and consumables.
Troubleshooting
If the tool does not start, check the power supply, inspect the power cord/plug for damage, or check if the carbon brushes are worn. If the tool is overloaded, release the switch, press it again, and let the tool run at no load for 30 seconds.
Manufacturer information
Hilti Corporation
Practical help
Common problems
Tool does not start
Check power supply, inspect power cord/plug, or replace worn carbon brushes.
Tool does not work
Tool is overloaded. Release the on/off switch, press it again, and let the tool run at no load for 30 seconds.
Tool does not achieve full power
Use an extension cord with an adequate conductor cross-section.
Before use
- Read and understand all safety warnings and instructions.
- Ensure the tool and accessories are in perfect working order.
- Check that the correct guard is fitted for the application.
- Ensure the side handle is securely attached.
- Check that the disc is correctly mounted and the clamping nut is tight.
- Verify the power supply matches the tool's rating plate.
Specs in practice
- Rated power input
- 710 W for AG 125-7SE, 800 W for AG 125-8SE.
- Maximum disc diameter
- 125 mm.
Model compatibility
- Use only synthetic-resin-bonded, fiber-reinforced discs with a maximum diameter of 125 mm.
- Discs must be approved for at least 11,500 rpm and a peripheral speed of 80 m/s.
- Always use the standard guard with an additional cover plate when cutting or slitting.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.