Crown CT21053LH-1.5 Manual Original página 34

It is recommended to set the torque regulator 5
into the position "Drill" to perform drilling�
Stepless speed adjustment
Speed is controlled from 0 to maximum by
pressing force of on / off switch 7� 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 choose the "1" gear, move the switch 5
back� This mode is used for the fastening of screws or
for large diameter hole drilling�
In order to choose the "2" gear, move the switch 5
forward� This mode is used for speed drilling of small
diameter holes�
Changing the rotational directions (see fig. 13)
Change the direction of rotation only after
a full stop of the motor, acting otherwise
may cause damage to the power tool.
Clockwise rotation (drilling, fastening of screws) -
move the reverse switch 8 to the left as it is shown in
fig. 13.
Counter clockwise
screws) - move the reverse switch 8 to the right as it is
shown in fig. 13.
Break rundown
Break rundown stops the keyless chuck 1 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 fas-
tening elements from being damaged�
Recommendations on the power tool
operation
Drilling (see fig. 14-17)
• Grease the drill bit regularly when drilling holes in
metals (except drilling non-ferrous metals and their al-
loys)�
• 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. 14).
• 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 15.
• In order to decrease dust production when drilling
holes in walls and ceilings, take actions indicated in
fig. 16-17.
rotation
(unscrewing
Screwing the screws (see fig. 18)
• To make fastening of screws easier and in order
to prevent cracking of the work pieces, first drill a
hole with a diameter equal to 2/3 of a diameter of the
screw�
• If you are connecting work pieces with the help of
screws, in order to achieve durable joint without get-
ting cracks, fracturing or layering, take actions shown
in figure 18.
Power tool maintenance / preventive
measures
Before execution of any procedures, centre the re-
verse switch 8.
Battery maintenance instruction
• Charge timely before the battery 2 is completely
exhausted� Stop operation in low power and charge
it immediately�
• Do not overcharge when the battery 2 is full, other-
wise it will shorten the life time�
• Charge battery 2 in the room temperature of 10°C
to 40°C (50°F to 104°F)�
• Charge battery 2 every 6 months without operation
for a long time�
• Replace worn out batteries in time� Decline of pro-
duction or a significantly shorter runtime of the power
tool after charging indicates aging of the battery 2 and
the need for replacement� It should be taken into ac-
count that the battery 2 may discharge faster if the
works take place in the temperature below 0°С.
the
• In case of long time storage without use, it is recom-
mended to store the battery 2 at room temperature, it
should be charged to 50%�
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
flush the power tool with compressed air thought the
ventilation slots 9�
After-sales service and application service
Our after-sales service responds to your questions
concerning maintenance and repair of your product as
well as spare parts� Information about service centers,
parts diagrams and information about spare parts can
also be found under: www.crown-tools.com.
Transportation of the power tools
• Categorically not to drop any mechanical impact on
the packaging during transport�
• When unloading / loading is not allowed to use any
kind of technology that works on the principle of clamp-
ing packaging�
Li-Ion batteries
The contained Li-Ion batteries are subject to the Dan-
gerous Goods Legislation requirements� The user can
English
34