Bosch GDR 10,8-LI 0.601.9A6.972 - Инструкция по эксплуатации - Страница 20

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Bosch Power Tools

Battery Charge-control Indication

The battery charge-control indicator 

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 consists 

of three green LEDs, and indicates the charge 
condition of the battery for a few seconds when 
the On/Off switch 

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 is pressed halfway or fully.

Temperature Dependent Overload Protection

When using as intended for, the power tool can-
not be subject to overload. When the load is too 
high or the allowable battery temperature range 
of 0 – 70 ° C is exceeded, the speed is reduced. 
The power tool will not run at full speed until 
reaching the allowable battery temperature.

Protection Against Deep Discharging

The lithium ion battery is protected against 
deep discharging by the “Electronic Cell Protec-
tion (ECP)”. When the battery is empty, the ma-
chine is switched off by means of a protective 
circuit: The inserted tool no longer rotates.

Working Advice

f

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 
maximum achieved torque results from the sum 
of all individual torques achieved through im-
pact. The maximum torque is achieved after an 
impact duration of 6 – 10 seconds. After this du-
ration, the tightening torque is increased only 
minimally.
The impact duration is to be determined for 
each required tightening torque. The actually 
achieved tightening 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 im-
pact series are measured and transferred into a 
diagram, resulting in the curve of a torque char-
acteristic. 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 fac-
tors:
– 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 con-

nection

The following application cases result accord-
ingly:
– A 

hard seat

 is given for metal-to-metal screw 

applications with the use of washers. After a 
relatively short impact duration, the maxi-
mum 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 fibre 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 im-
pact duration is required.

LED

Capacity

Continuous lighting 3 x green

≥

 2/3

Continuous lighting 2 x green

≥

 1/3

Continuous lighting 1 x green

< 1/3

Flashing light 1 x green

Reserve

OBJ_BUCH-1066-001.book  Page 20  Thursday, December 3, 2009  9:10 AM