Maintenance And Service; Maintenance And Cleaning - Bosch GBM Professional 23-2 Original Instructions Manual

18 | English
1st gear:
Low speed range; for working with
large drilling diameter.
2nd gear:
Higher speed range; for working
with small drilling diameter.
If the gear selector 7 cannot be ful-
ly engaged, lightly rotate the drive
spindle with the drill bit by twisting the drill
chuck.
Switching On and Off
To start the machine, press the On/Off switch 6
and keep it pressed.
Lock the pushed On/Off
switch 6 by pushing the lock-
on button 5 upward.
To switch off the machine,
release the On/Off switch 6
or when it is locked with the
lock-on button 5, briefly
press the On/Off switch 6 and then release it.
Adjusting the Speed (GBM 23-2 E)
The speed of the switched on power tool can be
variably adjusted, depending on how far the
On/Off switch 6 is pressed.
Light pressure on the On/Off switch 6 results in
a low rotational speed. Further pressure on the
switch results in an increase in speed.
Working Advice
Use drilling lubricant or cutting oil for cooling
and lubrication, and to avoid overheating or jam-
ming of the drill bit.
When drilling diameters >10 mm, drill a pilot
hole with a small drilling diameter. This allows
you to reduce the feed pressure and the power
tool is strained less.
For drilling in metal, use only perfectly sharp-
ened HSS drill bits (HSS=high-speed steel). The
appropriate quality is guaranteed by the Bosch
accessories program.
The machine vice, which is available as an acces-
sory, enables secure clamping of workpieces.
This prevents the workpiece from turning and
any accidents this would cause.
1 609 929 T43 | (12.11.09)

Maintenance and Service

Maintenance and Cleaning

Before any work on the machine itself, pull
the mains plug.
For safe and proper working, always keep
the machine and ventilation slots clean.
If the machine should fail despite the care taken
in manufacturing and testing procedures, repair
should be carried out by an after-sales service
centre for Bosch power tools.
In all correspondence and spare parts order,
please always include the 10-digit article
number given on the type plate of the machine.
After-sales Service and Customer
Assistance
Our after-sales service responds to your ques-
tions concerning maintenance and repair of your
product as well as spare parts. Exploded views
and information on spare parts can also be
found under:
www.bosch-pt.com
Our customer service representatives can an-
swer your questions concerning possible appli-
cations and adjustment of products and acces-
sories.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
Tel. Service: +44 (0844) 736 0109
Fax: +44 (0844) 736 0146
E-Mail: boschservicecentre@bosch.com
Ireland
Origo Ltd.
Unit 23 Magna Drive
Magna Business Park
City West
Dublin 24
Tel. Service: +353 (01) 4 66 67 00
Fax: +353 (01) 4 66 68 88
Bosch Power Tools