Ryobi RTS21 Operator's Manual page 18

To install anti-kickback pawls:
 Press and hold the button on the right side of the anti-
kickback pawls.
 Align the slot in the pawls over the rear hole in the riving
knife.
 Push the pawl handle down snapping them into place
and release the button.
NOTE: Pull on the pawl handle to make sure pawls are
securely locked.
To install blade guard:
 Lift the guard lever up to unlock.
 With the front of the blade guard raised, lower the back
of the guard into the middle hole of the riving knife. Push
the front of the guard down until it is parallel to the table
(see figure 15). If the blade guard is not parallel to the
table, the riving knife is not in the "up" position.
 Lock the guard in place by pushing the guard lever down.
NOTE: Blade alignment can be adjusted for different blade
widths. Refer to: To Check and Align the Riving Knife and
Saw Blade. Check the blade guard assembly for clearances
and free movement.
TO CHECK AND ALIGN THE RIVING KNIFE AND
SAW BLADE
See Figure 16.
To check alignment of the riving knife:
 Unplug the saw.
 Raise the saw blade by turning the height/bevel adjusting
handwheel clockwise.
 Remove the anti-kickback pawls and blade guard
assembly. Place a framing square or straight edge against
both the saw blade and the riving knife.
NOTE: Place framing square between carbide teeth and
measure from blade. This step will insure framing square
is square against blade from the front to back of blade.
 The saw blade and riving knife are aligned when the
framing square contacts both the blade and riving knife
evenly with no gaps.
If the riving knife is out of alignment with the saw blade,
adjustment is needed. The riving knife must be in alignment
front to back (horizontally) and top to bottom (vertically).
To adjust (horizontally and vertically):
 Remove the anti-kickback pawls and blade guard
assembly.
 From the back of the saw, loosen the screws holding the
mounting bracket.
 Reposition the riving knife left or right as needed to align
the riving knife with the saw blade.
 Once properly aligned, securely retighten all screws.
 Check again for squareness and continue to adjust if
needed.
ASSEMBLY
SCREWS
VERTICAL
ADJUSTMENT
18
CORRECT
INCORRECT
HORIZONTAL
ADJUSTMENT
Fig. 15
Fig. 16