Tools / Drills
Bosch GSR 12V-20 Professional Cordless Drill/Driver User Guide
Quick guide for the Bosch GSR 12V-20 and GSR 12V-20 HX cordless drill/drivers, covering battery installation, tool changing, operation, and safety instructions.
Table of contents
Quick guide from the manual
This document provides essential information for the Bosch GSR 12V-20 and GSR 12V-20 HX cordless drill/drivers. It covers safe operation, battery management, and basic maintenance. Always refer to the full manual for comprehensive safety warnings and technical specifications.
Device Description
The drill/driver is designed for driving and loosening screws and for drilling in wood, metal, ceramic, and plastic. Key components include the tool holder, torque presetting ring, gear selector, and battery release button.
Fitting
Charging the battery: Use only the chargers listed in the technical data. The battery is supplied partially charged; charge it fully before first use. The Li-ion battery is protected against deep discharge by Electronic Cell Protection (ECP).
Removing the battery: Press the release button and pull the battery downwards out of the tool.
Changing the tool: Always remove the battery before working on the tool. For the GSR 12V-20 HX, pull the locking sleeve forward to insert or remove the tool. For the GSR 12V-20, open the keyless chuck by turning it, insert the tool, and tighten the chuck firmly by hand.
Operation
Start-up: Insert the charged battery into the handle until it engages. Set the rotational direction switch to the middle position to prevent accidental starting.
Rotational direction: Use the rotational direction switch to change the direction. Right rotation for drilling and driving screws; left rotation for loosening screws and nuts.
Torque preselection: Use the torque presetting ring to select the required torque in 20 stages. The overload clutch is deactivated in the drill position.
Gear selection: Use the gear selector only when the tool is at a standstill. Gear I is for low speed (screwdriving/large drilling diameters), and Gear II is for high speed (small drilling diameters).
Maintenance and Cleaning
Always remove the battery before maintenance or transport. Keep the tool and ventilation slots clean for safe and efficient operation.
Manufacturer information
Bosch
Practical help
Common problems
Tool does not start
Check if the battery is charged and correctly inserted. Ensure the rotational direction switch is not in the middle position.
Tool stops during operation
The tool may be overloaded or the battery temperature is outside the permitted range. Allow the tool to cool down or reduce the load.
Before use
- Ensure the battery is fully charged.
- Check that the correct tool bit is securely inserted.
- Set the rotational direction switch to the desired direction.
- Select the appropriate gear for the task.
- Ensure the workpiece is securely clamped.
Specs in practice
- Rated voltage
- 10.8V or 12V, depending on the battery used.
- No-load speed (1st/2nd gear)
- 0-400 rpm / 0-1300 rpm, determining the speed range for different tasks.
- Max. torque (soft/hard)
- 18 Nm / 20 Nm, indicating the maximum force for screwdriving applications.
Images and diagrams
- Figure A: Removing the battery.
- Figure B: Inserting the tool (GSR 12V-20 HX).
- Figure C: Inserting the tool (GSR 12V-20).
- Figure D: Setting the rotational direction.
Model compatibility
- Compatible with Bosch 10.8V and 12V Li-ion batteries.
- Use only recommended Bosch chargers (e.g., GAL 12.. CV, AL 11.. CV, GAL 12V-.., GAX 18V-30).
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.