Makita BTW072 Manuale di istruzioni - Pagina 16
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MAINTENANCE
1. Limit mark
16
1. When the battery cartridge is discharged almost com-
pletely, voltage will drop and the fastening torque will be
reduced.
2. Socket
•
•
3. Bolt
•
•
4. The use of the universal joint or the extension bar some-
what reduces the fastening force of the impact wrench.
Compensate by fastening for a longer period of time.
5. Type of materials to be fastened, the manner of holding
the tool and the tool speed will affect the torque.
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
001145
Remove and check the carbon brushes regularly. 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 iden-
tical carbon brushes.
1
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.
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.