Changing The Tool; Method Of Operation; Starting Operation - Bosch Professional GDR Manual Original

empty, the machine is switched off by means of a protective
circuit: The inserted tool no longer rotates.
u Do not continue to press the On/Off switch after the
machine has been automatically switched off. The
battery can be damaged.
To remove the battery 6 press the unlocking buttons 5 and
pull out the battery downwards. Do not exert any force.
Observe the notes for disposal.

Changing the Tool

u Before any work on the machine itself (e. g.
maintenance, tool change, etc.) as well as during
transport and storage, remove the battery from the
power tool. There is danger of injury when
unintentionally actuating the On/Off switch.
u Regularly clean the power tool's air vents. The
motor's fan will draw the dust inside the housing and
excessive accumulation of powdered metal may cause
electrical hazards.
GDR 120-LI:
Inserting (see figure B)
Pull the locking sleeve 2 forward, push the insert tool to the
stop into the tool holder 1 and release the locking sleeve 2 to
lock the insert tool.
Screwdriver bits 13 can be inserted using a universal bit
holder with ball lock 12.
Removing
Pull the locking sleeve 2 forward and remove the insert
tool.
GDS 120-LI: (see figure C)
u When working with an application tool, pay
attention that the application tool is connected
securely on the tool holder. When the application tool
is not securely connected with the tool holder, it can
come off during application.
Slide the application tool 14 onto the square drive of the tool
holder 1.
With this system, there will be a slight amount of play around
the application tool 14 after connecting securely to the tool
holder ; this has no influence on the function/safety.
Operation

Method of Operation

The tool holder 1 with the tool is driven by an electric motor
via a gear and impact mechanism.
The working procedure is divided into two phases:
Screwing in and tightening (impact mechanism in action).
The impact mechanism is activated as soon as the screwed
connection runs tight and thus load is put on the motor. In
this instance, the impact mechanism converts the power of
the motor to steady rotary impacts. When loosening screws
or nuts, the process is reversed.
1.600.A00.X5J | 04.2016

Starting Operation

Inserting the battery
Set the rotational direction switch 7 to the centre position
to protect the power tool against accidental starting.
Insert the charged battery 6 from the front into the base of
the power tool until the battery is securely locked.
Reversing the rotational direction (see figure D)
The rotational direction switch 7 is used to reverse the
rotational direction of the machine. However, this is not
possible with the On/Off switch 8 actuated.
Right rotation: For driving in screws and tightening nuts,
press the rotational direction switch 7 through to the left
stop.
Left Rotation: For loosening and unscrewing screws and
nuts, press the rotational direction switch 7 through to the
right stop.
Gear selection, mechanical
u Actuate the gear selector 3 only when the machine
is at a standstill.
Two speed ranges can be preselected with the gear
selector 3.
Gear I:
Low speed range; for screwdriving or working with large
drilling diameter.
Gear II:
High speed range; for working with small drilling diameter.
If the gear selector 3 cannot be pushed through to the stop,
lightly turn the drill chuck with drill bit.
Switching On and Off
To start the machine, press the On/Off switch 8 and keep it
pressed.
The power light 9 lights up when the On/Off switch 8 is
slightly or completely pressed, and allows the work area to
be illuminated when lighting conditions are insufficient.
To switch off the machine, release the On/Off switch 8.
To save energy, only switch the power tool on when using it.
Adjusting the Speed
The speed of the switched-on power tool can be variably
adjusted, depending on how far the On/Off switch 8 is
pressed.
Light pressure on the On/Off switch 8 results in a low
rotational speed. Further pressure on the switch results in
an increase in speed.
Temperature Dependent Overload Protection
In normal conditions of use, the power tool cannot be
overloaded.
If the power tool is overloaded or not kept within the
permitted battery temperature range, the power output is
reduced or the power tool is switched off. The power tool
will not run at full power output again until the permitted
battery temperature has been reached.
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