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Bosch GBH 18V-28 DC Cordless Rotary Hammer User Manual

Quick guide for the Bosch GBH 18V-28 DC Cordless Rotary Hammer, covering setup, operation, maintenance, and safety instructions.

Table of contents

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Component overview of the GBH 18V-28 DC Page 3 Tool change procedures Page 4

Quick guide from the manual

This manual provides essential information for the safe and efficient operation of the Bosch GBH 18V-28 DC Cordless Rotary Hammer. Always read the full safety instructions before use.

Component overview of the GBH 18V-28 DC
Component overview of the GBH 18V-28 DC
Tool change procedures
Tool change procedures

Device Description

The tool is designed for hammer drilling in concrete, brick, and stone, as well as light to medium chiseling. It is also suitable for drilling without impact in wood, metal, ceramic, and plastic. Models with electronic control and right/left rotation are also suitable for screwdriving.

Operation

Battery: Use only original Bosch Li-ion batteries with the voltage specified on the tool's type plate. The battery is partially charged; charge it fully before first use.

Operating Modes: Use the impact/mode selector switch (12) to choose the mode. Press the release button (11) to change modes only when the tool is switched off.

  • Hammer drilling: For concrete or stone.
  • Drilling without impact: For wood, metal, ceramic, plastic, and screwdriving.
  • Vario-Lock: For adjusting the chisel position.
  • Chiseling: For light to medium demolition work.

Connectivity: When the Bluetooth Low Energy Module GCY 42 is inserted, data and settings can be transferred to a mobile device via Bluetooth wireless technology.

Maintenance and Cleaning

Always remove the battery before performing any work on the tool (maintenance, tool change, etc.) and for transport/storage. Keep the tool and ventilation slots clean for safe operation. Replace a damaged dust protection cap immediately.

Manufacturer information

Bosch

Brand profile
Manufacturer website https://www.bosch.com Support https://www.bosch.com/contact

Practical help

Common problems

Tool does not start

Check battery charge level and ensure it is properly inserted.

Tool stops automatically

Battery is discharged or the tool has overheated. Charge the battery or allow the tool to cool down.

Rapid shut-off (Kickback Control) triggered

Release the on/off switch and press it twice to restart.

Before use

  • Ensure the battery is fully charged.
  • Check that the correct tool bit is inserted and locked.
  • Verify the operating mode is set correctly.
  • Ensure the auxiliary handle is securely attached.
  • Check that the dust protection cap is not damaged.

Specs in practice

Impact energy
3.4 J, indicating the force of each hammer blow.
Max. drilling diameter (concrete)
28 mm, the maximum hole size for concrete.
No-load speed
0–950 min-1, the rotational speed without load.

Images and diagrams

  • Page 3: Overview of components including SDS-plus chuck, mode selector, and battery.
  • Page 4: Instructions for changing tools and using the keyed chuck.
  • Page 5: Using dust extraction attachments (GDE 28 D / GDE 18V-26 D) and depth stop.
  • Page 6: Attaching the fall protection system.

Model compatibility

  • Compatible with GBA 18V and ProCORE18V batteries.
  • Requires SDS-plus tools for hammer drilling and chiseling.
  • Dust extraction attachments GDE 28 D or GDE 18V-26 D are required for concrete/stone dust.

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Manual page author

Emily Carter

User documentation editor

Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.