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OBJ_BUCH-2610-002.book Page 9 Wednesday, June 15, 2016 9:11 AM
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.
Starting Operation
Inserting the battery
Set the rotational direction switch 9 to the centre position to
protect the power tool against accidental starting.
Insert the charged battery 8 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 9 is used to reverse the rota-
tional direction of the machine. However, this is not possible
with the On/Off switch 10 actuated.
Right rotation: For driving in screws and tightening nuts,
press the rotational direction switch 9 through to the left
stop.
Left Rotation: For loosening and unscrewing screws and
nuts, press the rotational direction switch 9 through to the
right stop.
Switching On and Off
To start the machine, press the On/Off switch 10 and keep it
pressed.
To switch off the machine, release the On/Off switch 10.
Adjusting the Speed
The speed of the switched-on power tool can be variably ad-
justed, depending on how far the On/Off switch 10 is
pressed.
Light pressure on the On/Off switch 10 results in a low rota-
tional speed. Further pressure on the switch results in an in-
crease in speed.
Preselecting the Speed/Impact Rate (not for power tools
with article number 3 601 JE0 0F. and 3 601 JE0 1F.)
With the button 6 you can preselect the required speed/im-
pact rate in 2 stages. Press the button 6 repeatedly until the
desired setting appears in the speed indicator 5. The selected
setting will be saved.
The required speed/impact rate depends on the material and
the working conditions, and can be determined through prac-
tical testing.
Switching the "PowerLight" On/Off (not for power tools
with article number 3 601 JE0 0F. and 3 601 JE0 1F.)
To switch the "PowerLight" 3 on, press button 4. To switch
the "PowerLight" 3 off, press button 4 again.
Bosch Power Tools
Battery Charge-control Indication
The battery charge-control indicator 11 consists of three
green LEDs, and indicates the charge condition of the battery
for a few seconds when the On/Off switch 10 is pressed half-
way or fully.
LED
Continuous lighting 3 x green
Continuous lighting 2 x green
Continuous lighting 1 x green
Flashing light 1 x green
Temperature Dependent Overload Protection
In normal conditions of use, the power tool cannot be over-
loaded. If the power tool is overloaded or not kept within the
permitted battery temperature range, the power output is re-
duced 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.
Working Advice
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 impact. The maximum torque is achieved
after an impact duration of 6–10 seconds. After this dura-
tion, 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
A test in which the achieved torques in an impact series are
measured and transferred to a diagram will produce the curve
of a torque characteristic. The height of the curve corre-
sponds with the maximum reachable torque, and the steep-
ness 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 given for metal-to-metal screw applications
with the use of washers. After a relatively short impact du-
ration, the maximum torque is reached (steep characteris-
tic curve). Unnecessary long impact duration only causes
damage to the machine.
– A spring-loaded seat is given for metal-to-metal screw ap-
plications, 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 back-
ing.
English | 9
Capacity
≥ 2/3
≥ 1/3
< 1/3
Reserve
1 609 92A 35M | (15.6.16)
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