Operation; Working Instructions - Bosch GBM 13-2 PROFESSIONAL Operating Instructions Manual

• Don't use damaged accessories such as stiff bits,
worn out sanding paper, split grinding wheels, etc.
• Don't use your tool in damp locations.
• Don't use your tool in the presence of flam-
able fluids or gases. Danger of explosion!
• Before drilling walls and ceilings, be sure
there are no water pipes, electric conduits,
gas lines, etc.
• Watch out for the initial torque reaction of
the drill, especially when drill bit is tight.
• Wear protective hair covering to contain
long hair.
• Do not wear loose clothing.
• Keep proper and safe footing when han-
dling the tool.
• Do not place such loads on the machine that it ceas-
es to turn. Damage the motor.
Bosch is only able to ensure perfect functioning of
the machine if the original accessories intended for
it are used.

Operation

Before connecting the plug to any electrical single-
phase outlet, be sure that the voltage matches the indi-
cations on the tool's name plate. A voltage in excess will
increase the revolution/peripheral of accesories speed;
a smaller voltage will reduce the power. Of tool's in both
cases, the tool's motor will be damaged and the user
will be exposed to hazards.
Switch
Its basic function is to switch the motor ON (intermittent
or continuous) and OFF.
Intermittent switching
ON - Press trigger of switch 5.
OFF - Release trigger
Continuous switching
ON - Press trigger of switch 5, then lock button 6 and
release it.
OFF - Press and release trigger on switch 5.
Changing speed
Impact drill is built with a sliding key mechanism which
has two positions. The position can be changed more
easily when the motor is almost stopping or stopped.
Rotate lever 8 180° to select the opposite position.
The lever seats naturally in position 1 and 2 (1
speed). If there is any difficult in getting the gears to engage
when changing speeds, turn the chuck a little bit by hand.
Accessories assembly
Bits
Make sure:
• The bit you are intending to use is the correct one for
this specific material.
12
• The bit is in perfect working conditions (not buckled/
correctly sharpened).
Acessories for:
Polishing, sanding, grinding, brushing, etc. - follow the
assembly and use instructions of the bits blister.
Assembly
Open the chuck and insert the accessory's shank until
it reaches the botton of the chuck. Use chuck key 7 to
tighten it up through the three holes of the chuck.
Warning!
An accessory shank that has only the tip fastened:
• will damage the chuck's jaws
• will destroy the accessory's shank thus making it
buckle due to the centrifugal force
• may cause an accident due to the wrong assembly.

Working instructions

Check the material to be drilled and select the correct
bit.
Do not drill with a bit that is inadequate for the job, be-
cause this will damage either your workpiece or the bit
itself.
Small workpieces
Use a vise or clamps to hold your workpiece. Loose
pieces could grip int the bit and cause accidents.
Select the right bit
By choosing the correct bit for every specific material,
and keeping it correctly sharpened, you'll allow your tool
to show its best performance.
Carbon tipped bits - wood
High speed steel bits - soft steel, aluminium, wood,
etc.
Carbide tipped bits - concrete, marble, ceramics, etc.
Attention!
When drilling in metal, use special cutting oil to prevent
the bit to burn. Drillings in concrete, stone, ceramics,
etc. should be in dry.
Side handle
To improve handling and safety, always use side han-
dle 9.
Depth stop rod
For serial drills of same depth you have to put the depth
stop 10 in the auxiliary handle and to adjust the depth
an 2
st nd
according to your necessity.
Chuck replacement
Use an open-end spanner at spanner surface 10 to re-
tain the chuck. Place the chuck key 8 in one of the 3
bores and loosen the chuck by turning it to the left using
the key as a lever. If the chuck is frozen in place, a tap
on the chuck key 8 should loosen it. The removal proce-
dure is reversed for re-assembling.