Makita BTW251 - Инструкция (Страница 6)

6
160
140
120
100
80
60
40
20
0
0 0.5 1.0 1.5 2.0
Standard bolt
Fastening torque
Fastening time (S)
Proper fastening torque
M16
M16
M14
M14 M12
M12
(1632)
(1428)
(1224)
(1020)
(816)
(612)
(408)
(204)
N m
(kgf cm)
007536
0
High tensile bolt
N m
(kgf cm)
Fastening torque
Fastening time (S)
Proper fastening torque
160(1632)
140(1428)
120(1224)
100(1020)
80(816)
60(612)
40(408)
20(204)
180(1836)
200(2040)
1.0 2.0 3.0
M14
M14
M12
M12 M10
M10
007535
NOTE:
•
Hold the tool pointed straight at the bolt or nut.
•
Excessive fastening torque may damage the
bolt/nut or socket. Before starting your job, always
perform a test operation to determine the proper
fastening time for your bolt or nut.
•
If the tool is operated continuously until the battery
cartridge has discharged, allow the tool to rest for
15 minutes before proceeding with a fresh battery
cartridge.
The fastening torque is affected by a wide variety of
factors including the following. After fastening, always
check the torque with a torque wrench.
1. When the battery cartridge is discharged almost
completely, voltage will drop and the fastening
torque will be reduced.
2. Socket
•
Failure to use the correct size socket will
cause a reduction in the fastening torque.
•
A worn socket (wear on the hex end or square
end) will cause a reduction in the fastening
torque.
3. Bolt
•
Even though the torque coefficient and the
class of bolt are the same, the proper
fastening torque will differ according to the
diameter of bolt.
•
Even though the diameters of bolts are the
same, the proper fastening torque will differ
according to the torque coefficient, the class of
bolt and the bolt length.
4. The use of the universal joint or the extension bar
somewhat reduces the fastening force of the
impact wrench. Compensate by fastening for a
longer period of time.
5. The manner of holding the tool or the material of
driving position to be fastened will affect the
torque.
6. Operating the tool at low speed will cause a
reduction in the fastening torque.
MAINTENANCE
CAUTION:
•
Always be sure that the tool is switched off and the
battery cartridge is removed before attempting to
perform inspection or maintenance.
Replacing carbon brushes
Fig.9
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
Use a screwdriver to remove two screws then remove
the rear cover.
Fig.10
Raise the arm part of the spring and then place it in the
recessed part of the housing with a slotted bit
screwdriver of slender shaft or the like.
Fig.11
Use pliers to remove the carbon brush caps of the
carbon brushes. Take out the worn carbon brushes,
insert the new ones and replace the carbon brush caps
in reverse.
Fig.12
Fig.13
Make sure that the carbon brush cap have fit into the
holes in brush holders securely.
Reinstall the rear cover and tighten two screws securely.
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be
performed by Makita Authorized Service Centers,
always using Makita replacement parts.