Makita 9521NB Manuel D'instructions page 6

OPERATING INSTRUCTIONS
Installing the wheel guard (Fig. 1 & 2)
Important:
Always be sure that the tool is swiched off and
unplugged before installing or removing the wheel
guard.
Mount the wheel guard with the tab on the wheel
guard band aligned with the notch on the bearing box.
Then rotate the wheel guard 180° clockwise (for
9520NB) or counterclockwise (for 9521NB and
9522NB). Be sure to tighten the screw securely.
Side grip (auxialiary handle) (Fig. 3)
For 9521NB and 9522NB only
For your own safety, always use the side grip. The
side grip can be installed on either side of the tool.
Installing or removing the depressed center
wheel (Fig. 4 & 5)
Important:
Always be sure that the tool is switched off and
unplugged before installing or removing the wheel.
Mount the inner flange onto the spindle. Fit the wheel
on over the inner flange and screw the lock nut onto
the spindle. Press the shaft lock to prevent spindle
rotation, then use the lock nut wrench to tighten the
lock nut securely.
Warning:
Only actuate the shaft lock when the spindle is not
moving.
Switch ON and OFF (Fig. 6)
Caution:
Before plugging in the tool, always check to see that
the switch actuates properly and returns to the ''OFF''
position when the rear of the switch lever is
depressed.
To switch on, depress the rear of the switch lever and
push it forward. The depress the front of the switch
lever to lock it.
To switch off, depress the rear of the switch lever.
Operation (Fig. 7)
Keep the edge of the wheel or disc at an angle of
about 15° – 30° to the workpiece surface. During the
break-in period with a new wheel, do not work the tool
in the B direction. It will cut into the workpiece. Once
the edge of the wheel has been rounded off by use,
the wheel may be worked in both A and B directions.
Warning:
• It should never be necessary to force the tool. The
weight of the tool applies adequate pressure. Forc-
ing and excessive pressure could cause dangerous
wheel breakage.
• Continued use of a worn-out wheel may result in
wheel explosion and serious personal injury.
Depressed center wheel should not be used after it
has been worn down to 75 mm for Model 9520NB or
90 mm for Models 9521NB and 9522NB in diam-
eter.
6
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MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Replacement of carbon brushes (Fig. 8 & 9)
Whenever carbon brushes must be replaced, they cut
out the tool automatically. When this occurs, replace
both carbon brushes at the same time. Use only
identical carbon brushes.
To maintain product safety and reliability, repairs,
maintenance or adjustment should be carried out by
Makita Authorized Service Center.