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W1772/W1773 37" Drum Sander
SERVICE
Tension
New V-belts often stretch and loosen up during the first
16 hours of use. After this period, they should be inspect
-
ed and re-tensioned if necessary.
Proper tension is important for optimum power transmis
-
sion. However, too much tension may cause premature
bearing failure.
The correct V-belt tension is achieved when the V-belts
can be deflected
1
/2"–
3
/4" when pushed in the middle with
moderate pressure. See Figure 39 for an example of how
to perform a V-belt deflection test with a straightedge
and ruler.
To adjust V-belt tension, do these steps:
1. DISCONNECT POWER TO THE SANDER!
2. Remove the table height handwheel and open the
pulley cover.
3. Using a 19mm wrench, turn the motor mount nuts in
the direction shown in
Figure 40 to loosen or tighten
the V-belts.
4. Close the pulley cover and reinstall the handwheel.
Removal/Replacement
Replace the V-belt if you notice fraying, cracking, glaz-
ing, or any other damage. A worn/damaged V-belt will not
provide optimum power transmission from the motor to
the drums.
V-belt removal and replacement is simply a matter of
loosening the V-belts until you can roll them off the pul
-
leys, replacing them with a MATCHED set, then re-ten
-
sioning them.
Note: A matched set means both the V-belts are the same
size and also have the same serial number.
Pulley Alignment
Pulley alignment is another important factor in power
transmission and belt life. The pulleys should be parallel
to each other and in the same plane (coplaner) for opti
-
mum performance.
V-Belt Service
Figure 39. Checking V-belt tension with a
straightedge and a ruler
.
OFF
Figure 40. V-belt tension controls.
Tighten
V-Belts
Loosen
V-Belts