Tools / Drills
User Manual for Bosch GSR 18V-21 and GSB 18V-21 Cordless Drill/Driver
Quick guide for the Bosch GSR 18V-21 and GSB 18V-21 cordless drill/driver. Includes setup, operation, maintenance, and safety instructions.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
This manual covers the operation and maintenance of the Bosch GSR 18V-21 and GSB 18V-21 cordless drill/drivers. Always read the safety instructions before use. Ensure the battery is charged before first use and remove it before any maintenance or transport to prevent accidental activation.
Product description
The tool features a keyless chuck, torque presetting ring, gear selector, and worklight. The GSB model includes an additional operating mode ring for impact drilling.
Assembly
Battery: Insert the charged battery into the handle until it clicks into place. To remove, press the release button and pull the battery out.
Tool change: Open the keyless chuck by turning it in the direction of rotation 1. Insert the tool and tighten the chuck sleeve firmly by hand in the direction of rotation 2.
Operation
Direction of rotation: Use the rotational direction switch to change the direction. Set to the middle position to prevent accidental starting.
Operating mode: Use the torque presetting ring (GSR) or operating mode ring (GSB) to select between drilling, screwdriving, or impact drilling (GSB only).
Speed and torque: Adjust speed by varying pressure on the on/off switch. Use the torque ring to pre-select the required torque in 20 stages. Use the gear selector to choose between low speed (high torque) and high speed (low torque).
Maintenance and service
Cleaning: Keep the tool and ventilation slots clean for safe operation.
Carbon brushes: Check the length of the carbon brushes every 2-3 months and replace both if necessary. Use only original Bosch carbon brushes.
Service: For repairs or spare parts, contact your local Bosch service center or visit www.bosch-pt.com.
Official resources from the manual
Manufacturer information
Bosch
Practical help
Common problems
Tool suddenly stops
Check if the battery is discharged or if the tool has overheated. Allow it to cool down.
Tool fails in dusty environments
Remove and check the carbon brushes for wear.
Before use
- Ensure the battery is fully charged.
- Check that the correct bit is inserted and tightened.
- Set the correct gear for the task (1 for high torque, 2 for high speed).
- Set the correct operating mode (drilling, screwdriving, or impact drilling).
Specs in practice
- 0-27,000 min-1
- Impact rate (GSB model only)
Images and diagrams
- (1) Tool holder
- (2) Keyless chuck
- (3) Torque presetting ring
- (4) Operating mode ring (GSB only)
- (5) Gear selector
Model compatibility
- Compatible with Bosch GBA 18V and ProCORE18V batteries.
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.