Ryobi BS903 - Manual (Page 21)

21
ADJUSTMENTS
ADJUSTING BLADE GUIDE SUPPORT, THRUST
BEARINGS, AND BLADE GUIDE BEARINGS
See Figures 20 - 22.
NOTE: Tighten the lock knob and refer to “Adjusting Blade
Tension” and “Tracking the Blade” procedures explained
in the ASSEMBLY section of this operator’s manual prior
to making adjustments. Fine tuning of the bearings can be
done with a flathead screwdriver.
The upper and lower blade guide bearings and thrust bear-
ings support the saw blade during cutting operations. The
adjustment of the guide bearings should be checked when-
ever a different blade is installed.
To Adjust Blade Guide Support:
 Remove the blade guard by loosening the two phillips
screws.
 Adjust the position of the blade guide support. Loosen
the blade guide support screw on the right side of the
blade guide assembly using the 2.5 mm hex key.
 Slide the upper blade guide support on the shaft until
the front edge of the thrust bearing is about 1/64 in. (0.4
mm) behind the back of the blade. Tighten the screw
securely.
Repeat this procedure for the lower blade guide support.
Replace the blade guard if no additional adjustments are
to be made.
To Adjust Thrust Bearings:
The thrust bearings support the back edge of the blade
during cutting. The blade should not contact the thrust
bearings when you stop cutting. It is important that both
upper and lower thrust bearings be adjusted equally.

Remove the blade guard assembly by loosening the two
phillips screws.
 Using the 2.5 mm hex key, loosen the thrust bearing
screw.
 Slide the thrust bearing until the bearing is centered
behind the blade. Tighten the thrust bearing screw
securely.
NOTE: When properly adjusted, the blade will be centered
in front of the thrust bearing.
 Using a flathead screwdriver, turn the screw (centered in
the thrust bearing) until the bearing is within 1/64 in. (0.4
mm) of the blade.
Repeat this procedure on the lower thrust bearing located
below the saw table. Replace the blade guard if no additional
adjustments are to be made. Fig. 21
BLADE
GUIDE
BLADE GUIDE
SUPPORT SCREW
BLADE GUIDE
SCREW
BLADE GUARD REMOVED
FOR CLARIFICATION ONLY
THRUST
BEARING
THRUST
BEARING
SCREW
Fig. 20
LOWER BLADE
GUIDE SUPPORT
THRUST
BEARING
SCREW
THRUST BEARING
WARNING:
Never operate saw without the blade guard secured in
place. To do so could result in possible serious personal
injury.
UPPER BLADE
GUIDE SUPPORT
BLADE GUIDE
SCREW
BLADE GUIDE
SUPPORT
SCREW
LOCK
KNOB