Bosch GBM Professional 23-2 Original Operating Instructions page 9

OBJ_BUCH-43-002.book Page 9 Monday, October 29, 2007 11:42 AM
Assembly
Auxiliary Handle
Operate your power tool only with the auxil-
iary handle 2.
Screw the auxiliary handle 2 into the thread 8 on
the gear head.
Changing the Tool
Before any work on the power tool itself,
pull the mains plug.
Drilling tools with a MT2 morse taper can be in-
serted directly into the tool holder 4. For drill bits
with MT1 morse taper, use the reducing sleeve 10.
Pay attention that the morse cone and the morse
taper are free of grease.
The use of drilling tools with cylindrical shank is
possible with the key chuck 12. For this, place
the tapered arbor 11 into the tool holder 4 and
screw on the key chuck 12.
Do not exert any force when inserting the
morse taper or the tapered arbor. This can
damage the tool holder and the inserted tool.
Before removing the inserted tool, unscrew the
auxiliary handle 2.
Place the drift 9 into the opening 3 in such a man-
ner that the rounded off side faces to the pres-
sure plate 1.
If the drift 9 cannot be inserted through the drive
spindle, turn the tool insert a little.
Press the drift 9 toward the pressure plate 1 and
release the tool insert from out of the tool holder.
Dust/Chip Extraction
Dusts from materials such as lead-containing
coatings, some wood types, minerals and
metal can be harmful to one's health. Touch-
ing or breathing-in the dusts can cause aller-
gic reactions and/or lead to respiratory infec-
tions of the user or bystanders.
Certain dusts, such as oak or beech dust, are
considered as carcinogenic, especially in con-
nection with wood-treatment additives (chro-
mate, wood preservative). Materials contain-
ing asbestos may only be worked by
specialists.
Bosch Power Tools
– Use dust extraction whenever possible.
– Provide for good ventilation of the working
place.
– It is recommended to wear a P2 filter-class
respirator.
Observe the relevant regulations in your coun-
try for the materials to be worked.
Operation
Starting Operation
Observe correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the type plate of the
power tool.
Gear Selection, Mechanical
Actuate the gear selection lever 7 only when
the machine is at a complete standstill.
Two speed ranges can be preselected with the
gear selection lever 7.
1st gear:
Low speed range; for working with
large drilling diameter.
2nd gear:
High speed range; for working with
small drilling diameter.
If the gear selection lever 7 cannot
be fully engaged, lightly rotate the
drill bit by twisting the drill chuck.
Switching On and Off
To start the power tool, 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 power tool,
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.
1 609 929 M65 | (29.10.07)
English | 9