Ryobi BS903 BS903_979_trillingual.pdf - Page 10

ASSEMBLY SQUARing the saw table TO THE BLADE See Figure 8, page 19.  Turn the lock knob counterclockwise to unlock the blade guide assembly. Turning the blade guide knob clockwise, raise the blade guide assembly as far as it will go. Turn the lock knob clockwise to retighten.  Place a small combination square on the saw table beside the blade.  Loosen the table lock knob and rotate the angle adjustment knob to tilt the saw table up or down to align table 90° to blade (0° position). Retighten the table lock knob.  Using a 4 mm hex key, adjust the zero stop set screw until the set screw just touches the saw housing.  Check squareness of the saw table to the blade. Make readjustments if necessary.  Loosen screw on scale indicator with a phillips screwdriver and align scale indicator to zero.  Tighten all screws securely. ADJUSTING BLADE TENSION See Figures 9 - 10, page 19.  Remove the switch key.  Before using the band saw, turn the blade tension knob on the top of the saw clockwise to engage tension. Note: Adjustments of blade tension can be made at anytime. Another method of checking blade tension has to do with the sound the blade makes when plucked like a guitar string.  Pluck the back straight edge on the coasting side opposite the blade guides while turning the tension knob. Sound should be a musical note. Sound becomes higher pitched as tension increases. Using either method to check blade tension can be developed with practice.  Never increase blade tension so tight as to completely compress the spring. When completely compressed, the spring can no longer act as a shock absorber. Note: Too much tension may cause the blade to break. Too little tension may cause the blade to slip on the wheels. tracking the BLADE See Figure 10, page 19. Note: Adjust blade tension properly before making tracking adjustments. Check that the blade guides are not interfering with the blade. To adjust:  Open the front cover by releasing the upper and lower latches. Watch the blade's position on the upper tire through the tracking view window as, by hand, you slowly turn the upper wheel clockwise. If the blade moves away from the center of the tire, the tracking must be adjusted. If the blade has moved left or right of center: Note: It may be necessary to loosen the hex nut for a larger range of adjustments. Be sure to retighten after adjusting.  Turn the blade tracking knob (clockwise if blade has moved left and counterclockwise if blade has moved right) while turning the wheel by hand until the blade moves back and rides in the center of the tire.  Check the position of the blade on the lower tire. The blade should be completely on the tire. If not, adjust the tracking until the blade is on both tires.  Rotate the upper wheel by hand in a clockwise direction for a few more turns. Make sure the blade stays in the same location on the tires. Readjust, if necessary, until blade is tracking properly.  Close front cover and relatch. Note: The 1/8 in. blade may not track properly in the center of the wheel. It may be better to track this blade on the back half of the upper wheel. warning: The blade guides have been preset at the factory. These settings are functional for some applications. We recommend that you check and adjust blade guide settings before first use of your saw. Refer to "Adjusting blade guide support, thrust bearings, and blade guide bearings" procedures explained in the adjustments section of this operator's manual. 10 - English