Bedienungsanleitung Bosch GDR 12V-105 (Seite 14 von 191) (Alle Sprachen)

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14 | English

Inserting

Pull the locking sleeve (2) forward, guide the application tool

(1) into the tool holder up to the stop and release the locking

sleeve (2) to lock the application tool.

Use only screwdriver bits with ball catch (13) (DIN 3126-

E6.3). Other screwdriver bits (12) can be inserted using a

universal bit holder with ball catch (11).

Removing the application tool

– Pull the locking sleeve(2) forward and remove the applic-

ation tool.

Operation

Method of Operation

The tool holder (1) (with the application 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 load is therefore put on the motor.

The impact mechanism then converts the power of the mo-

tor to steady rotary impacts. When loosening screws or nuts,

the process is reversed.

Starting Operation

Inserting the battery

Note: The use of batteries unsuitable for your power tool can

lead to malfunctions or damage to the power tool.

Set the rotational direction switch (7) to the middle position

to avoid unintentionally switching it on. Insert the charged

battery (6) into the handle until you feel it engage and it is

flush with the handle.

Set the rotational direction (see figureC)

The rotational direction switch (7) is used to change the ro-

tational direction of the power tool. However, this is not pos-

sible while the on/off switch (8) is being pressed.

Right rotation: To drive in screws and tighten nuts, press

the rotational direction switch (7) through to the left stop.

Left Rotation: To loosen and unscrew screws and nuts,

press the rotational direction switch (7) through to the right

stop.

Switching on/off

To start the power tool, press and hold the on/off switch

(8).

The LED (3) lights up when the on/off switch (8) is lightly or

fully pressed, meaning that the work area is illuminated in

poor lighting conditions.

To switch off the power tool, release the on/off switch (8).

Adjusting the Speed

You can adjust the speed of the power tool when it is on by

pressing in the on/off switch (8) to varying extents.

A light pressure on the on/off switch (8) results in a low rota-

tional speed. Increased pressure on the switch causes an in-

crease in speed.

Battery Charge Indicator

When the on/off switch (8) is pressed in halfway or com-

pletely, the battery charge indicator (9) indicates the bat-

tery's state of charge for several seconds. The indicator con-

sists of three green LEDs.

LED Capacity

Continuous lighting 3 x green ≥ 66%

Continuous lighting 2 x green 33–66%

Continuous lighting 1 x green ≤ 33%

Flashing light 1 x green Reserve

Temperature-dependent overload protection

In normal conditions of use, the power tool cannot be over-

loaded. If the power tool is overloaded or the permitted bat-

tery temperature is exceeded, the electronics of the power

tool will switch off until the temperature returns to within the

optimum operating temperature range.

Practical advice

The torque depends on the impact duration. The maximum

achieved torque results from the sum of all individual

torques achieved through impact. Maximum torque is

achieved after an impact duration of 6–10seconds. After

this duration, the tightening torque increases only minimally.

The impact duration is to be determined for each required

tightening torque. The tightening torque actually achieved

should always be checked with a torque wrench.

Screw applications with hard, spring-loaded or soft seats

When the achieved torques in an impact series are measured

during a test and transferred into a diagram, the result is the

curve of a torque characteristic. The height of the curve cor-

responds 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 the material being screwed/bolted

together

– Lubrication conditions at the screw/bolt connection

The following application cases result accordingly:

– A hard seat is a metal-to-metal screw application which

uses 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 also a metal-to-metal screw ap-

plication but uses spring washers, disc springs, studs or

screws/nuts with conical seats. It is also called a spring-

loaded seat when extensions are used.

– A soft seat is a screw application of e.g. metal on wood or

a screw application that uses lead washers or fibre wash-

ers as backing.

1 609 92A 7X0 | (14.07.2022) Bosch Power Tools

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