Adjust Blade Tracking Mechanism; Adjust Blade Tension - PowerTec BS900 Owner's Manual

• Turn the blade guide knob, located below the upper
door latch, to lower the Upper blade guide completely.
• Carefully unsnap and remove the blade guard panel.
• Release the table insert from the aluminum table.
• Unscrew and remove table locking insert assembly at
the end of table slot.
• Carefully release the used blade and remove it through
the slot on the aluminum table.
• Replace with a new blade only. Inspect the new blade
first. The teeth of blade should point down when
installed. If not, turn the blade inside out.
• Place the new blade through the aluminum table slot.
• Slide the blade onto the upper and lower blade wheels.
• Position the blade between the upper blade guide.
• Turn the blade tension lever clockwise until it stops.
• Close both upper and lower doors. The doors need to
have appropriate seal for the dust collection system to
function. Check to see the doors are in good alignment
with the doorframes. Secure the door latches.
• Replace the table insert onto the aluminum table.
• Replace the table locking insert assembly.
• Snap the blade guard panel into position.

• Adjust blade tracking mechanism.

• Check blade tension. Adjust it if necessary.
Figure 7
Tension Knob
Tracking
Window
Upper
Door Latch
Guide
Adjusting
Knob
Figure 8
Blade Tension
Lever
Tracking
Knob
Tracking
lock nut
Blade Guide
Lock Knob
Blade Guard
Panel
ADJUST BLADE TRACKING MECHANISM
Refer to Figure 7
WARNING
Watch for sharp blade edges when turning the wheels.
the
Turn the switch to OFF position and disconnect the ma-
chine from power source before adjusting blade tracking
mechanism.
• Unlock door latches and open the doors.
• Manually rotate the drive wheel clockwise. The saw
blade should travel downward at the table insert.
Observe the blade movement from the viewing window
on the side of upper door.
• If the saw blade stays centered on both wheels, No
further adjustment is necessary.
tilting
• If the saw blade keeps tilt toward one side and is not
in the center of idler wheel, the saw blade needs to be
adjusted.
Loosen
• Loose the lock nut of the tracking control knob on the
right upper side panel to release the tracking control
knob.
• Carefully and slowly turn the idle wheel clockwise with
the left hand and adjust the tracking control knob with
the right hand until the blade is centered.
• Turn tracking knob counterclockwise when blade rides
away from the upper door. Turn tracking knob clockwise
when blade rides toward the upper door.
• Tighten the lock nut of tracking control knob when the
blade is centered.
• Close the upper door.
• During the machine operation, the blade tracking can be
observed from the viewing window.

ADJUST BLADE TENSION

Refer to Figure 7
• The blade tension is adjusted automatically by a
spring-loaded blade tensioning mechanism and should
require no frequent adjustment. However, there is blade
tension knob on top of machine for fine tuning of the
blade tension.
• Over tensioned blade is prone to excessive wear and
breakage. Under tensioned blade is prone to fluttering
and movement during operation.
• To adjust the blade tension, the blade cannot have any
contact with the upper and lower blade guides. Raise
the upper blade guide to the top. Move the blade guides
away from the blade.
• Turn the machine on.
• Release the blade tension knob very slowly, ¼ turn at a
time, until the blade starts to flutter.
• Now tighten the blade tension knob very slowly until the
blade stop fluttering.
• Further tighten the blade tension knob for another ¼
turn.
• Turn the machine off.
• Properly adjust upper and lower blade guides before
use.
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