Makita 6917FD MAINTENANCE

1. When the battery cartridge is discharged almost com-

pletely, 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 some-

what 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.

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. Limit mark

001145