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Note: If conveyor belt continually tracks to one side
of the machine, reversing the belt on the conveyor
table may remedy the problem. To make sure the
conveyor table is not twisted, place a level on the
conveyor table. Level the machine if needed. If there
is still a problem, proceed with the steps below:
Step 1: Check conveyor drive roller and driven roller
to make sure they are parallel to surface of conveyor
table. To do this, first center conveyor belt on the
conveyor table. Then lay a straight-edge on the
exposed edge of conveyor table on left (outboard)
side, extending it over the roller. Note distance
between roller and straightedge.
Step 2: Now repeat Step 1 on right (inboard) side of
conveyor. Compare the measurements from side to
side. If they are not equal, loosen one of the
brackets that hold the roller in place. Tip this bracket
until distance between roller and straight-edge are
equal from side to side, then tighten bracket.
9.4 Commutator brush inspection
To maintain motor efficiency, inspect the two carbon
brushes every two months, or more frequently if
sander is heavily used. Stalling or loss of power may
be a symptom of worn carbon brushes. If one brush
is worn out, replace both at the same time.
Continued use of damaged or
worn brushes may result in damage to motor
armature.
1.
Unplug sander from power source.
2.
Unscrew and remove cap with flat blade
screwdriver. See Figure 9-4.
3.
Gently pry up an edge of the brass clip, until the
spring causes it to disengage from hole. (Notice
orientation of brush as you remove it; it should
be inserted in the same manner; curvature of
brush will match curvature of motor.)
4.
Pull out brush and inspect. Brush should be
replaced if any of the following are discovered:
Brush has worn to about 1/2-inch long.
Signs of crumbling, burning or breaking.
End of brush is rough or pitted.
Abnormal coloration of spring
Broken lead in spring
Collapsed spring
5.
Install new brush (or reinstall current brush) and
gently press it all the way into hole until the
brass clip is secured.
6.
Install cap.
7.
Repeat for other brush.
NOTE:
It is recommended that sander be run
without load for several minutes to seat new
brushes.
9.5 Additional servicing
Any additional servicing should be performed by an
authorized service technician.
16
Figure 9-4
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