Tools / Power Tools
Bosch GEX 18V-125 Cordless Random Orbit Sander User Manual
Quick guide for the Bosch GEX 18V-125 Cordless Random Orbit Sander, covering assembly, battery charging, sanding sheet replacement, dust extraction, and operation.
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Jump to the sectionQuick guide from the manual
The Bosch GEX 18V-125 is a cordless random orbit sander designed for dry sanding of wood, plastic, filler, and coated surfaces. Before using the tool, ensure the battery is fully charged. The tool features an orbital stroke rate preselection thumbwheel for adjusting performance based on the material and application.
Assembly
Always remove the battery before performing any maintenance or changing accessories to prevent accidental startup. To attach a sanding sheet, clean the sanding pad with a brush, then press the sanding sheet firmly onto the pad, ensuring the holes align for optimal dust extraction. Use a Pad Saver (accessory) to extend the life of the sanding pad.
Operation
To switch on, press the on/off switch. To switch off, press it again. You can preselect the orbital stroke rate using the thumbwheel (1-6). For fatigue-free work, the tool can be held from above, the side, or the front. After working at a low stroke rate for an extended period, run the tool at maximum speed for 3 minutes without load to cool it down.
Dust Extraction
The tool supports self-generated dust extraction using the included dust bag or external extraction via a hose. For optimal performance, empty the dust bag regularly. When working on vertical surfaces, hold the tool so the dust bag or extraction hose faces downward.
Maintenance
Keep the tool and ventilation slots clean for safe and efficient operation. For repairs or spare parts, contact an authorized Bosch service center and provide the 10-digit article number from the tool's nameplate.
Manufacturer information
Bosch
Practical help
Common problems
Tool does not start
Check battery charge level and ensure it is properly inserted.
Poor dust extraction
Empty the dust bag, ensure holes in the sanding sheet align with the pad, or check if the extraction hose is clogged.
Battery charge indicator does not light up
The battery may be defective and needs replacement.
Before use
- Ensure the battery is fully charged.
- Check that the sanding sheet is correctly attached and holes are aligned.
- Verify the sanding pad is not damaged.
- Ensure the dust bag or extraction hose is properly connected.
- Check that the workpiece is securely clamped.
Specs in practice
- Orbital stroke rate
- Adjustable speed (6000-10000 min-1) to match the material being sanded.
- Orbit diameter
- 2.5 mm, determines the sanding pattern and material removal rate.
- Sanding pad diameter
- 125 mm, standard size for compatible sanding discs.
Images and diagrams
- The manual includes diagrams showing the attachment of the sanding sheet (A), replacement of the sanding pad (B), and connection of the dust bag (C-E) or external vacuum hose (F).
Model compatibility
- Use only original Bosch sanding accessories.
- Compatible with GBA 18V and ProCORE18V battery series.
- Compatible with GAL 18, GAX 18, and GAL 36 series chargers.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.