Crown CT21090HMX, Original Instructions Manual

Page: 35 / 204

35
English
LED lamp
When the on / off switch 15 is pushed, the LED lamp 4
is automatically switched on that allows to carry out
works in low light conditions�
Function switch (see fig. 17)
[CT21093HMX-2, CT21093HMX-4]
Switching the operation modes shall be
carried out only in the off mode of the
tool's motor.
F unction switch 11 is designed for the switching
the following operation modes of the tool:
Screwing (set the function switch 11 in the position
indicated in figure 17.1) - for screwing in of threaded
fastening elements� In this operation mode, it's pos-
sible to set one of the 21 torque values�
Drilling (set the function switch 11 in the position in-
dicated in figure 17.2) - non-impact drilling in wood,
synthetics, metal�
Impact drilling (set the function switch 11 in the po-
sition indicated in figure 17.3) - impact drilling in ma -
sonry, concrete, natural stone�
Torque regulator
Rotate the regulator 12 in order to set one of the 21
torque values most suitable for the work performed�
Attention: for models CT21093HMX-2, CT21093H -
MX-4 this function works in "Screwing" mode only.
It is recommended to set the torque regu-
lator 12 into the position "Drill" to perform
drilling�
Stepless speed adjustment
Speed is controlled from 0 to maximum by
pressing force of on / off switch 15 � Weak
pressing results in low revolutions, which
enable a smooth power tool switch-on�
Step speed selector switch
Attention: one can only change the revo -
lutions per minute range after the engine
fully stops.
In order to put in the "L" gear, move the switch 9 back�
This mode is used for the fastening of screws or for
large diameter hole drilling�
In order to choose the "H" gear, move the switch 9
forward� This mode is used for speed drilling of small
diameter holes�
Changing the rotational directions (see fig. 18)
Change the direction of rotation only
after a full stop of the motor, acting oth -
erwise may cause damage to the power
tool.
Clockwise rotation (drilling, fastening of screws) -
move the reverse switch 14 to the left as it is shown
in fig. 18.1.
Counter clockwise rotation
(unscrewing the
screws) - move the reverse switch 14 to the right as it
is shown in fig. 18.2.
Spindle automatic locking
If the on / off switch 15 is not pressed, the spindle of the
power tool is locked this enables to use the power tool
as an ordinary screwdriver (for example it can be used
to tighten manually screws or bolts, if the battery is low)�
Break rundown
Break rundown stops the spindle of the power tool
immediately after the power tool is turned off� This
helps to avoid an excessive tightening of the bolts and
screws and prevents work pieces, screwdriver bits and
slots of fastening elements from being damaged�
Brushless motor
Power tool equipped with a brushless motor that pro-
vides the following advantages (compared to the pow-
er tool having a brush motor):
• high reliability due to the lack of wearing parts (car-
bon brushes, commutator);
•
increased operating time on a single charge;
• compact design and light weight�
Recommendations on the power tool op -
eration
Drilling (see fig. 19-21)
• Grease the drill bit regularly when drilling holes in met-
als (except drilling non-ferrous metals and their alloys)�
•
When drilling hard metals, apply more force to the
power tool and lower the rotation speed�
• When drilling large diameter holes in metal, first drill
a hole with a smaller diameter and ream it till the nec-
essary diameter (see fig. 19.1).
• In order to avoid splitting of the surface at an exit
point of a drill bit when drilling holes in wood, follow the
instructions shown in figure 19.2.
• In order to decrease dust production when drilling holes
in walls and ceilings, take actions indicated in fig. 20.
• When drilling holes in glazed ceramic tiles, in order
to improve the drill centering accuracy and to save
the glaze from damage, apply adhesive tape to the
presumed hole center and drill after that (see fig. 21).
Start drilling at lower speed increasing it as the hole
deepens� Caution: for models CT21093HMX-2,
CT21093HMX-4 - drill tiles in the impactless drill -
ing operation mode only.
Impact drilling
[CT21093HMX-2, CT21093HMX-4]
During the impact drilling, the result does not depend
on the pressure applied to the power tool - this is
caused due to the peculiarities in the impact mecha-
nism design� That is why you should not apply exces-