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15
Conveyor Belt Tension and Tracking
Conveyor belt tension adjustment may be
necessary during the break-in period to
compensate for belt stretching.
IMPORTANT: The conveyor belt has been over-
tensioned for the purpose of shipping. Before
operating the sander, adjust the belt tension
according to the following instructions!
Tension. To adjust the tension of the conveyor
belt, first adjust the take-up screw nut (A, Figure
20) using the attached wrench (B, Figure 20).
Do this on both sides of the conveyor to obtain
approximately equal tension on both sides of the
belt when taut. Insufficient belt tension will
cause slippage of conveyor belt on the drive
roller during sanding operation; the conveyor
belt is too loose if it can be stopped by hand
pressure applied directly to the top of the
conveyor belt. Excessive belt tension can result
in bent rollers, bent brackets, and/or premature
wearing of the bushings or belt.
Tracking. Belt tracking adjustments are made
while the conveyor belt is running. After the
proper belt tension is obtained (see above), turn
the conveyor on and set it at the fastest speed
setting. Watch for a tendency of the conveyor
belt to drift to one side of the conveyor. To
adjust tracking, tighten the take-up screw nut on
the side toward which the belt is drifting, and
loosen the take-up screw nut on the opposite
side an equal amount.
Adjusting the take-up screw nuts on either side
of the conveyor allows belt tracking adjustments
to be made without affecting belt tension.
NOTE: Adjust take-up screw nuts only 1/4 turn
at a time. Then allow time for the belt to react to
the adjustments before proceeding further. Try
to avoid over adjustments.
Trackers
T
he sander comes equipped with “Trackers”,
ceramic guides that reduce the amount of
adjustments needed to keep the conveyor belt
tracked (centered) on the conveyor bed. These
guides have a magnetic backing to keep them in
place. If a Tracker wears through, it can be
reversed by turning it over. Page 22 contains
more information about re-setting trackers.
Conveyor Belt Replacement
1. Unplug the machine from the wall
receptacle, and unplug the motor cord from
the control box receptacle.
2. Raise drum to its highest position using the
handwheel.
Figure 20