Conveyor Belt Replacement; Commutator Brush Inspection - Jet JWDS-1020-M Mode D'emploi

maintenance ever become necessary, the drum has
been designed for easy removal and replacement.
1. Unplug sander from power source.
2. Remove two socket head screws (C, Figure 10‐2)
on the bearing block.
3. Loosen two screws on the coupling (D, Figure 10‐
2).
4. Carefully slide drum out of coupling and remove
from machine.
Figure 10‐2: drum removal
10.3 Conveyor belt replacement
1. Disconnect sander from power.
2. Raise drum to highest position.
3. Loosen two screws (E, Figure 10‐3) and turn
take‐up screws (F, Figure 10‐3) on both sides of
conveyor to relieve belt tension, and slide the
driven roller fully inward.
4. Loosen two table locking screws (G, Figure 10‐3).
5. Remove lock nut (G, Figure 10‐3).
6. Remove two socket head screws that attach
conveyor table to base.
7. Lift up conveyor table and remove it from
machine. Avoid tearing the belt on any edges
underneath the conveyor table.
8. Set conveyor on motor side and slide conveyor
belt off end of conveyor table.
9. Install new belt and re‐install conveyor table.
Check alignments, and tension and track the
new belt.
Figure 10‐3: conveyor belt replacement
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 centre 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.
10.4 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.
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 10‐4.
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 12mm 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.
14
Continued use of damaged or