Tools / Power Tools
Bosch Professional GEX 18V-125 Random Orbit Sander User Manual
Quick guide for the Bosch Professional GEX 18V-125 random orbit sander, covering battery operation, sanding sheet replacement, dust extraction, and operational settings.
Table of contents
Quick guide from the manual
The Bosch Professional GEX 18V-125 is a cordless random orbit sander designed for dry sanding of wood, plastic, filler, and coated surfaces. Before starting, ensure the battery is fully charged and inserted until it clicks. Always remove the battery before performing any maintenance or changing accessories to prevent accidental startup.
Operation
To turn the tool on, press the On/Off switch (1). To turn it off, press the switch again. You can preselect the orbital stroke rate using the thumbwheel (7), with settings 1-2 for low, 3-4 for medium, and 5-6 for high speed. The tool features Constant Electronic to maintain a consistent speed under load.
Sanding Sheet Replacement
To remove the sanding sheet (10), lift it from the side and pull it off the sanding pad (8). Clean the pad of dust and dirt before attaching a new sheet. Ensure the holes in the sanding sheet align with the holes in the sanding pad for optimal dust extraction.
Dust Extraction
The tool supports both self-generated dust extraction using the included dust bag (2) and external extraction via a hose (16). For the dust bag, push it onto the extraction outlet (13) until it is flush. Empty the bag regularly to maintain suction performance. For external extraction, connect a suitable vacuum cleaner hose to the extraction outlet.
Maintenance and Care
Always remove the battery before maintenance. Keep the tool and ventilation slots clean for safe and efficient operation. If the battery charge indicator shows a high defect risk (1 LED), it is recommended to replace the battery.
Manufacturer information
Bosch
Practical help
Common problems
Reduced suction power
Empty the dust bag or clean the filter element. If using an external vacuum, check the hose and connections.
Battery charge indicator shows high defect risk (1 LED)
Performance and runtime may be reduced; it is recommended to replace the battery.
Sanding pad damaged
Replace the sanding pad (8) immediately.
Before use
- Ensure the battery is fully charged.
- Check that the sanding sheet is correctly aligned with the pad holes.
- Verify the dust bag or vacuum hose is securely attached.
- Ensure the tool is switched off before inserting the battery.
- Wear appropriate personal protective equipment (dust mask, safety glasses).
Specs in practice
- No-load speed
- 6000–10000 min-1, adjustable via thumbwheel.
- Orbit diameter
- 2.5 mm, determines the sanding pattern.
- Sanding pad diameter
- 125 mm, standard size for this model.
Model compatibility
- Compatible with GBA 18V and ProCORE18V battery series.
- For maximum performance, use ProCORE18V batteries with at least 4.0 Ah.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.