User Manual for Bosch GPO 12V-77 Professional Polishing Machine
Quick guide for the Bosch GPO 12V-77 Professional Polishing Machine. Includes setup, speed and timer settings, battery management, and maintenance instructions.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
This manual provides essential information for the Bosch GPO 12V-77 Professional Polishing Machine. Always read the full safety instructions before use.

Product Description
The GPO 12V-77 is a cordless polisher designed for polishing coated surfaces. Key features include speed preselection, a timer function, and constant electronic control.
Assembly
Changing the Polishing Pad: Lift the pad from the side and pull it off the polishing disc. Clean the disc before attaching a new pad. Press the new pad firmly onto the disc.



Changing the Polishing Disc: Remove the polishing pad. Hold the spanner flat on the tool with the open-ended spanner and turn the disc anticlockwise to remove. Tighten the new disc clockwise while holding the spanner flat.
Operation
Switching On/Off: Press the On/Off switch to start. Use the locking mechanism to lock the switch in the 'on' position. Release the switch or press it briefly to turn off.

Speed and Timer Settings: Use the buttons (7) to adjust speed and set a timer. Follow the LED indicators to confirm settings.
Battery Management
Use only recommended Bosch chargers. The battery charge indicator shows the remaining capacity. If the tool is overloaded or the battery temperature is outside the permitted range, the tool will reduce speed or shut down.
Maintenance
Remove the battery before any maintenance. Keep the tool and ventilation slots clean for safe operation.
Manufacturer information
Bosch
Practical help
Common problems
Overload or battery temperature out of range. Let tool run at no-load to cool down.
Rectify blockage and switch on again.
Before use
- Check polishing tool is fitted properly
- Ensure tool can move freely
- Perform 1-minute no-load test run
- Check battery charge level
Specs in practice
- Rated voltage
- 12V
- Max. polishing disc diameter
- 77 mm
Images and diagrams
- (1) On/Off switch
- (4) Polishing disc
- (7) Speed/Timer buttons
- (10) Polishing pad
- (11) Open-ended spanner
Model compatibility
- Use only GBA 12V batteries and GAL/GAX chargers
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.