Bosch Professional GBM 50-2 Original Instructions Manual page 28

28 | English
Transport
– Check that all application tools are firmly connected with
the power tool and that the drill core is no longer situated
in the application tool.
– Wind up the network cable completely and tie it together.
– Always use the transport handle (3) to lift and transport
the power tool.
– Never pull on the crank or the cable of the power tool in
order to move it.
Maintenance and service
Maintenance and Cleaning
Pull the plug out of the socket before carrying out any
u
work on the power tool.
To ensure safe and efficient operation, always keep
u
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.
Replacing carbon brushes
Indicator for carbon brush change:
The indicator for changing the carbon brush (14) will start to
light up red approx. eight hours before the power tool auto-
matically switches off as a result of the carbon brushes wear-
ing out. You can continue to use the power tool until it
switches off.
The power tool should be sent to the Bosch after-sales ser-
vice. 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 inten-
ded specifically for your product.
– Unscrew the carbon brush cover (1) using a suitable
screwdriver.
– Replace the spring-loaded carbon brushes and screw the
cap back on again.
Adjusting the Guide Rail Gap (see figures E1 – E3)
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 ap-
plication tools and the coolant supply system and place
the power tool down on a firm, level and horizontal sur-
face.
– Turn the drill unit (44) using the crank handle (4) up-
wards, until the recess is above the uppermost screw
(45).
– Unscrew the upper screw (45) for the left guide rail using
the hex key (4 mm) (25).
– Turn the drill unit (44) all the way up using the crank
handle (4).
1 609 92A 7Y6 | (31.05.2022)
– Unscrew the three lower screws (45) for the left guide rail
using the hex key (4 mm) (25).
– Tighten the four screws (46) using the hex key (3 mm)
(25) while turning the drill unit (44) 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 (45) 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 (45) for the left guide rail using the hex key (4 mm)
(25).
Adjusting the laser (see figure F)
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 (47).
– Slightly undo the screws for the clip (49).
– Move the laser cross right or left by turning the screw
(50) in the appropriate direction.
– Move the laser cross towards or away from the tool by
turning the screw (51) in the appropriate direction.
– Retighten the screws for the clip (49).
– Screw the laser cover (47) back on.
After-Sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com
The Bosch product use advice team will be happy to help you
with any questions about our products and their accessor-
ies.
In all correspondence and spare parts orders, please always
include the 10‑digit article number given on the nameplate
of the product.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham Uxbridge
UB 9 5HJ
At www.bosch-pt.co.uk you can order spare parts or arrange
the collection of a product in need of servicing or repair.
Tel. Service: (0344) 7360109
E-Mail: boschservicecentre@bosch.com
You can find further service addresses at:
www.bosch-pt.com/serviceaddresses
Disposal
The power tool, accessories and packaging should be re-
cycled in an environmentally friendly manner.
Bosch Power Tools