# Maintenance and Cleaning

- Pull the plug out of the socket before carrying out any work on the power tool.

- To ensure safe and efficient operation, always keep the power tool and the ventilation slots clean.

In order to avoid safety hazards, if the power supply cord needs to be replaced, this must be done by Bosch or by an after-sales service centre that is authorised to repair Bosch power tools.

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The indicator for changing the carbon brush (14) will start to light up red approx. eight hours before the power tool automatically switches off as a result of the carbon brushes wearing out. You can continue to use the power tool until it switches off.
The power tool should be sent to the Bosch after-sales service. For addresses, see the section "After-Sales Service and Application Service".

Never replace only a single carbon brush!

Note: Only use carbon brushes supplied by Bosch and intended specifically for your product.

- Unscrew the cap (1) using a suitable screwdriver.
- Replace the spring-loaded carbon brushes and screw the cap back on again.

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If the power tool vibrates strongly when drilling or a gap is visible on the guide rail, the width of the guide rail gap must be adjusted. This prevents application tools from being snapped off and avoids damage to the power tool.

- Pull the mains plugs out of the plug socket, remove application tools and the coolant supply system and place the power tool down on a firm, level and horizontal surface.
- Turn the drill unit (46) using the crank handle (4) upwards, until the recess is above the uppermost screw (47).
- Unscrew the upper screw (47) for the left guide rail using the hex key (4 mm) (25).
- Turn the drill unit (46) all the way up using the crank handle (4).
- Unscrew the three lower screws (47) for the left guide rail using the hex key (4 mm) (25).
- Tighten the four screws (48) using the hex key (3 mm) (25) while turning the drill unit (46) up and down using the crank handle (4). Adjust the required feed force while doing so.
- Turn the drill unit all the way up and tighten the three lower screws (47) for the left guide rail using the hex key (4 mm) (25).
- Turn the drill unit all the way down and tighten the upper screw (47) for the left guide rail using the hex key (4 mm) (25).

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To ensure precise drilling, the laser beams must be checked after intensive use and adjusted as necessary.

- To switch on the laser, push the laser on/off switch (7) into position "I".
- Unscrew the laser cover (49).
- Slightly undo the screws for the clip (51).
- Move the laser cross right or left by turning the screw (52) in the appropriate direction.
- Move the laser cross towards or away from the application tool by turning the screw (53) in the appropriate direction.
- Retighten the screws for the clip (51).
- Screw the laser cover (49) back on.