CROWN CT21072HX-2 BMC - Инструкция по эксплуатации - Страница 27

27

English

Torque regulator

Rotate the regulator 

3

 in order to set one of the 21 

torque values most suitable for the work performed�

It is recommended to set the torque regulator 

3

into the position "Drill" to perform drilling�

Stepless speed adjustment

Speed is controlled from 0 to maximum by 

pressing force of on / off switch 

6

� 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 

4

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 

4

forward� This mode is used for speed drilling of small 

diameter holes�

Changing the rotational directions (see fig. 15)

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 

7

 to the left as it is shown in 

fig. 15.1.

Counter  clockwise  rotation

 (unscrewing the 

screws) - move the reverse switch 

7

 to the right as it is 

shown in fig. 15.2.

Spindle automatic locking

If the on / off switch 

6

 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�

Recommendations  on  the  power  tool 

operation

Drilling (see fig. 16-17)
[CT21072HX-2,  CT21072HQX-2  (with  installed 

quick-change keyless chuck)]

•

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. 16.1).

•

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 16.2.

•

In order to decrease dust production when drilling 

holes in walls and ceilings, take actions indicated in 

fig. 17.

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 7.
Battery maintenance instruction

•

Charge timely before the battery 

11 

is completely 

exhausted� Stop operation in low power and charge 

it immediately� 

•

Do not overcharge when the battery 

11

 is full, other-

wise it will shorten the life time� 

•

Charge battery 

11

 in the room temperature of 10°C  

to 40°C (50°F to 104°F)�

•

Charge battery 

11 

every 6 months without operation 

for a long time�

•

Replace worn out batteries in time� Decline of pro-

duction or a sig

nificantly shorter runtime of the power 

tool after charging indicates aging of the battery 

11

 and 

the need for replacement� It should be taken into ac-

count that the battery 

11

 may discharge faster if the 

works take place in the temperature below 0°С. 

•

In case of long time storage without use, it is recom-

mended to store the battery 

11

 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 

8

�

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�