Ryobi P420 - Manual (Page 13)

13
DANGER:
Never attach a wood cutting or carving blade of any
type to this grinder. It is only designed for grinding and
sanding. Use for any other purpose is not recommended
and creates a hazard, which will result in serious injury.
DANGER:
Never attach a type 1 straight or cut-off wheel to this
angle grinder. It is only designed for grinding and sanding.
Use for any other purpose is not recommended and
creates a hazard, which will result in serious injury.
INSTALLING GRINDING WHEEL
See Figure 6.
WARNING:
Thoroughly inspect a new grinding wheel before you
install it on the grinder. Tap lightly around the wheel
using a wooden hammer. Listen carefully to the resulting
sounds. Places with fissures or cracks will result in a
different sound. Do not use a wheel containing fissures
or cracks. When you install a new grinding wheel, carry
out a no load revolution test of approximately one minute
with the grinding wheel facing a safe direction, i.e., away
from people or objects.
 Remove the battery pack from the grinder.
NOTE: The grinder is shipped with the disc flange and
clamp nut attached to the spindle.
 Depress and hold the spindle lock and rotate the clamp
nut until the spindle locks.
NOTE: To prevent damage to the spindle or spindle lock,
always allow motor to come to a complete stop before
engaging spindle lock.
 Loosen and remove the clamp nut from the spindle. Do
not remove the disc flange.
 Make sure the flats on the bottom of the disc flange are
engaged with the flats on the spindle.
 Place the grinding wheel over the spindle.
 Thread the clamp nut on the spindle with the flat side of
the nut facing up.
 Fit the raised, small diameter portion of the clamp nut
into the hole in the wheel and finger tighten.
OPERATION
Fig. 6
DISC FLANGE
CLAMP NUT
GRINDING WHEEL
SPINDLE
TOOLLESS
GUARD
SPINDLE
LOCK
WRENCH
TO TIGHTEN
TO LOOSEN
WARNING:
Always install a grinding wheel with the depressed center
against the disc flange. Failure to do so will cause the
grinding wheel to crack when tightening the clamp nut.
This could result in serious personal injury because of loose
particles breaking off and being thrown from the grinder.
Do not overtighten.
 Depress and hold the spindle lock button and rotate the
wheel clockwise until the spindle locks in position.
 Tighten the clamp nut securely with the wrench provided.
Do not overtighten.