Ryobi P421 - Manual (Page 8)

8 — English
ASSEMBLY
INSTALLING GRINDING WHEEL
See Figure 2, page 12.
DANGER:
Use ONLY Type 27 depressed center grinding wheels
(such as the one provided with this product). NEVER
attach a Type 1 straight or cut-off wheel to this angle
grinder. Use for any other purpose is not recommended
and creates a hazard, which will result in serious injury.
DANGER:
Never attach a wood cutting or carving blade of any type
to this grinder. It is only designed for grinding and sand-
ing. Use for any other purpose is not recommended and
creates a hazard, which will result in serious injury.
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.
 Depress the spindle lock button 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.
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.
 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.
 Depress 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.
INSTALLING THE SIDE HANDLE
See Figure 3, page 12.
WARNING:
The side handle must always be used to help prevent
loss of control and possible serious injury.
The side handle can be installed on the top, left, or right side
of the grinder, depending on operator preference.

Insert the side handle into the desired operating position.
 Turn the side handle clockwise to securely tighten.
OPERATION
WARNING:
Do not allow familiarity with this product to make you
careless. Remember that a careless fraction of a second
is sufficient to inflict serious injury.
TYPE 27 − OK TO USE TYPE 1 − DO NOT USE
WARNING:
Always remove battery pack from the tool when you are
assembling parts, making adjustments, cleaning, or when
not in use. Removing battery pack will prevent accidental
starting that could cause serious personal injury.