Tools / Power Tools
Operating Instructions for Bosch GRW 18V-120 Professional Mixer
Quick guide for the Bosch GRW 18V-120 Professional cordless mixer. Includes assembly, operation, safety instructions, and maintenance.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
The Bosch GRW 18V-120 Professional is a cordless mixer designed for mixing powder-based construction materials like mortar, plaster, and adhesives, as well as solvent-free paints and varnishes. Safety first: Always use the auxiliary handle, wear appropriate personal protective equipment (including eye protection and a P2 dust mask), and ensure the mixing container is stable before starting.
Product Description
The mixer features a variable speed control, soft start, constant electronic control, and KickBack Control for user safety. It uses an M14 tool holder for the stirrer paddle.
Assembly
Auxiliary Handle
Before first use, screw the auxiliary handle (11) into the handle element (10). The thread contains a thread-locker that ensures the handle does not loosen during normal operation after a 12-hour drying time.
Extension Piece
A 13 cm extension piece (8) can be attached to the drive spindle (7) to increase the working height for taller users. Tighten it using the provided open-ended spanner (12).
Changing the Tool
Screw the stirrer paddle (13) into the drive spindle (7). Hold the drive spindle with a 22 mm open-ended spanner and tighten the paddle with a second spanner (22 mm or 24 mm).
Operation
Switching On/Off
To start, push the lock-off switch (5) upwards, then press and hold the on/off switch (6). Release the switch to stop.
Adjusting Speed
Speed can be adjusted continuously by varying the pressure on the on/off switch (6) or by using the speed preselection thumbwheel (4).
KickBack Control
This feature provides better control and user protection. If the tool suddenly rotates around the axis of rotation, it will switch off automatically. The LED (1) will flash red. Release and press the on/off switch again to restart.
Maintenance and Cleaning
Always remove the battery before performing any maintenance or tool changes. Keep the tool and ventilation slots clean for safe and efficient operation.
Manufacturer information
Bosch
Practical help
Common problems
KickBack Control LED flashes red
The rapid shut-off function has been triggered. Release the on/off switch and press it again to restart.
Tool will not switch on
The KickBack Control function may be faulty. Have the tool serviced by a qualified professional using original spare parts.
Battery charge indicator does not light up
The battery may be defective and needs to be replaced.
Before use
- Ensure the battery is fully charged.
- Check that the auxiliary handle is securely attached.
- Verify the correct mixer paddle is selected for the material viscosity.
- Ensure the mixing container is stable and secure.
Specs in practice
- No-load speed
- 0–600 min⁻¹ (adjustable)
- Max. paddle diameter
- 120 mm
Images and diagrams
- Page 3 shows the main components: (1) KickBack Control LED, (4) Speed preselection, (6) On/Off switch, (7) Drive spindle, (11) Auxiliary handle, (13) Stirrer paddle.
Model compatibility
- Compatible with GBA 18V and ProCORE18V batteries.
- For maximum performance, use ProCORE18V batteries with ≥ 5.5 Ah.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.