Grizzly G9983 instruction manual Belt Tension, Replacing V-Belts

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.

Figure 27. Turning these nuts allows you to raise/lower the motor to adjust 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.

Replacing V-Belts

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.

Figure 28. Loosen the V-belt by using the

adjustment nuts.

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 setscrewsÑremove 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.

G9983 15" Open-End Wide-Belt Sander -31-