Crown CT12018 Originalbetriebsanleitung Seite 14

Power tool designation
The power tool is intended for tightening and loosing
nuts and bolts�
The area of the tool application can be expanded due
to use of additional accessories�
Power tool components
1 Tool holder
2 Body
3 On / off switch (reverse function)
4 Ventilation slots
5 Screw plug
6 Socket wrench *
* Optional extra
Not all of the accessories illustrated or described
are included as standard delivery.
Installation and regulation of power tool
elements
Before carrying out any works on the power tool it
must be disconnected from the mains.
Socket wrench mounting / dismounting (see fig. 1)
• Insert the socket wrench 6 onto the tool holder 1 and
press it to fix it (see. fig. 1).
• Disassembly operations do in reverse sequence�
Initial operating of the power tool
Always use the correct supply voltage: the power sup-
ply voltage must match the information quoted on the
power tool identification plate.
Switching the power tool on / off
Rotation to the right
Press and hold the on / off switch 3 on the bottom (see
fig. 2.1), to switch off - release it.
Rotation to the left
Press and hold the on / off switch 3 on the top (see
fig. 2.2), to switch off - release it.
Design features of the power tool
The tool holder 1 with the socket wrench 6 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 ac-
tion)� The impact mechanism is activated as soon as
the screwed connection runs tight and thus load is
put on the motor, converting the power of the motor
to steady rotary impacts� When loosening screws or
nuts, the process is reversed�
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 dura-
tion of 3-5 seconds� After this duration, the tighten-
ing torque is increased only minimally� However, the
transmission housingheats up noticeably�
The
heating-up are high wear of all hammer
mechanism components and a high
requirement of lubricant.
The impact duration is to be determined for each re-
quired tightening torque� The actually achieved tight-
ening torque is always to be checked with a torque
wrench�
Recommendations on the power tool
operation
Apply the socket wrench to the tool hold-
er only when the power tool it is switched
off.
A torque depends on the following factors:
• Strength properties of the screws / nuts�
• Type of backing (washer, disc spring, seal)�
• Strength properties
screwed / bolted together�
• Lubrication conditions at the screw / bolt connec-
tion�
Hard seat - is given for metal-to-metal screw applica-
tions with the use of washers� After a relatively short
impact duration, the maximum torque is reached� Un-
necessary long impact duration only causes damage
to the machine�
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�
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 impact duration is required�
The impact duration is to be determined through practi-
cal testing�
At temperatures below the freezing point, run the ma-
chine for approx� 3 minutes at no-load to improve its
lubricating capacity�
Power tool maintenance / preventive
measures
Before carrying out any works on the power tool
it must be disconnected from the mains.
Cleaning of the power tool
An indispensable condition for a safe long-term exploi-
tation of the power tool is to keep it clean� Regularly
English
14
consequences of
of the material
excessive
being