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G9983 15" Open-End Wide-Belt Sander -31-
V-Belt Tension
The sanding belt is driven by two V-belts on the
Model G9983. The V-belts must have adequate
tension for proper power transmission. Proper
tension is usually achieved when the V-belts can
be deflected no more than 1" with moderate fin-
ger pressure at the midpoint between the wide-
belt pulleys and the motor pulleys. The large
cover on the right-hand side of the sander must
be removed to access the V-belts and the sand-
ing motor.
Thread the nuts shown in Figure 27 down to
tighten the V-belts, or thread the nuts up to
loosen the V-belts.
Always inspect V-belts for damage or deteri-
oration when adjusting for tension. Should
you find evidence of cracking, abrasion or
damage from wood chips or other foreign
materials, replace the belt immediately. Belt
breakage may lead to mechanical damage or
operator injury.
Figure 27. Turning these nuts allows you to
raise/lower the motor to adjust the V-belts.
Replacing V-Belts
Figure 28. Loosen the V-belt by using the
adjustment nuts.
Inspect the V-belts closely; if you see any glazing,
cracking or fraying, replace the belts. Always
replace the two V-belts at the same time for prop-
er power transmission.
To replace the V-belts:
1. Disconnect sander from the power
source and shut off air pressure.
2. Loosen the top nut on the motor adjustment
bolt shown in Figure 28. Turn the bottom nut
counterclockwise to raise the motor (or pry
motor up with a scrap piece of wood) and
loosen the V-belts.
3. When V-belts are sufficiently loose, slide
them off of the motor pulley.
4. To remove the V-belts from the roller pulley,
the roller needs to be removed. Open the
left-hand access door and remove the platen
micro-adjust knob by loosening the setscrew
that secures the face. The plate underneath
the knob is secured to the casting by two
setscrews—remove these. Figure 29 shows
the knob and indicator plate removed from
the casting.
5. Remove the large cap screws, also shown in
Figure 29, to loosen the casting on the roller
shafts.