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OBJ_BUCH-241-002.book Page 9 Thursday, December 14, 2006 8:52 AM
Starting Operation
Inserting the Battery
Use only original Bosch lithium ion batteries
with the voltage listed on the nameplate of
your power tool. Using other batteries can lead to
injuries and pose a fire hazard.
Note: Use of batteries not suitable for the machine can
lead to malfunctions of or cause damage to the power
tool.
Set the rotational direction switch 8 to the center posi-
tion in order to avoid unintentional starting. Insert the
charged battery 7 into the handle so that it can be felt
to engage and faces flush against the handle.
Reversing the Rotational Direction (see figure C)
The rotational direction switch 8 is used to reverse the
rotational direction of the machine. However, this is not
possible with the On/Off switch 9 actuated.
Right rotation: For driving in screws and tightening
nuts, press the rotational direction switch 8 through to
the left stop.
Left Rotation: For loosening and unscrewing screws
and nuts, press the rotational direction switch 8
through to the right stop.
Switching On and Off
To start the power tool, press the On/Off switch 9 and
keep it pressed.
The power light 4 lights up when the On/Off switch 9
is slightly pressed, and enables illumination of the
screwing location in unfavorable light conditions.
To switch off the power tool, release the On/Off
switch 9.
Adjusting the Speed
The speed of the switched on power tool can be vari-
ably adjusted, depending on how far the On/Off switch
9 is pressed.
Light pressure on the On/Off switch 9 results in a low
rotational speed. Further pressure on the switch results
in an increase in speed.
Temperature Dependent Overload Protection
When using as intended for, the power tool cannot be
subject to overload. When the load is too high or the
allowable battery temperature of 70 °C is exceeded,
the speed is reduced. The power tool will not run at full
capacity until after cooling down.
Protection Against Deep Discharging
The lithium ion battery is protected against deep dis-
charging by the "Electronic Cell Protection (ECP)".
When the battery is empty, the machine is switched off
by means of a protective circuit: The inserted tool no
longer rotates.
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Working Instructions
Apply the power tool to the screw/nut only
when it is switched off. Rotating tool inserts can
slip off.
The torque depends on the impact duration. The maxi-
mum achieved torque results from the sum of all individ-
ual torques achieved through impact. The maximum
torque is achieved after an impact duration of 6–10
seconds. After this duration, the tightening torque is
increased only minimally.
The impact duration is to be determined for each
required tightening torque. The actually achieved tight-
ening torque is always to be checked with a torque
wrench.
Screw Applications with Hard, Spring-loaded or
Soft Seat
When in a test, the achieved torques in an impact
series are measured and transferred into a diagram, the
result is the curve of a torque characteristic. The height
of the curve corresponds with the maximum reachable
torque, and the steepness indicates the duration in
which this is achieved.
A torque gradient depends on the following factors:
•
Strength properties of the screws/nuts
•
Type of backing (washer, disc spring, seal)
•
Strength
properties
of
screwed/bolted together
•
Lubrication conditions at the screw/bolt connection
The following application cases result accordingly:
•
A hard seat is given for metal-to-metal screw appli-
cations with the use of washers. After a relatively
short impact duration, the maximum torque is
reached (steep characteristic curve). Unnecessary
long impact duration only causes damage to the
machine.
•
A spring-loaded seat is given for metal-to-metal
screw applications, however with the use of spring
washers, disc springs, studs or screws/nuts with
conical seat as well as when using extensions.
•
A soft seat is given for screw applications, e. g.,
metal on wood or when using lead washers or fiber
washers as backing.
For a spring-loaded seat as well as for a soft seat, the
maximum tightening torque is lower than for a hard
seat. Also, a clearly longer impact duration is required.
the
material
being
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