Grizzly g9983 Owner's Manual page 31

symptom possible cause
lines across width 1. sanding belt seam is open or damaged.
of workpiece.
More material is 1. Workpiece is not supported as it comes out
removed from the
of sander.
end of workpiece
than the length
2. pressure rollers not set correctly.
(snipe).
glossy spots 1. Worn sanding belt.
or streaks on
2. rear pressure roller too low.
workpiece.
sanding belt clogs 1. sanding belt grit too small for particular job.
quickly.
2. excessive depth of cut.
3. Wood is too moist.
sanding belt 1. low air pressure.
does not tension
2. air leaks in system.
correctly; rollers slip
under belt.
sanding belt runs 1. air eye fork clogged.
off to one side,
2. oscillation return valve closed.
stopping the sander.
3. oscillation timing incorrect.
sanding belt will not 1. sanding belt is not tensioned.
start.
2. limit switches engaged.
3. emergency stop plate engaged.
poor, non- 1. platen adjusted incorrectly, above bottom
aggressive sanding
surface level of lower sanding rollers.
results.
2. sanding belt loaded with sawdust.
3. sanding belt worn out.
Conveyor belt not 1. Conveyor rollers moved out of adjustment.
tracking in center.
Conveyor belt 1. Conveyor rollers have incorrect tension.
slipping.
2. Conveyor rollers contaminated with dirt or
dust.
emergency brake 1. air pressure incorrect.
stops slow.
2. air leak in system.
3. brake rotor contaminated with oil.
4. brake pads worn out.
grinding noise when 1. brakes severely worn out.
braking.
Model G9983 (Mfg. Since 8/09)
possible solution
1. repair or replace sanding belt.
1. hold workpiece up with your hands as it comes out,
or set up an outfeed table for your workpiece after it
comes out.
2. adjust the pressure rollers.
1. replace sanding belt.
2. raise rear pressure roller.
1. replace with a coarser grit sanding belt.
2. reduce depth of cut.
3. allow wood to dry out.
1. adjust air pressure to 75 psi at primary regulator.
2. inspect all hoses and connections for leaking air;
use water on suspected area to detect bubbles.
1. Clean the intake hole on the air eye fork.
2. open valve.
3. adjust oscillation timing.
1. tension sanding belt.
2. Center sanding belt so it is not touching the limit
switches.
3. Make sure emergency stop switch is released.
1. adjust platen on the same plane as, or lower than,
bottom surface level of lower rollers.
2. Clean sanding belt to unload sawdust.
3. replace sanding belt with a new one.
1. re-adjust conveyor rollers.
1. adjust conveyor rollers to increase tension.
2. Clean conveyor rollers.
1. adjust air pressure to 75 psi.
2. Find and fix air leaks.
3. Clean brake rotor with automotive brake parts
cleaner.
4. replace brake pads.
1. replace brake pads, have rotor turned (possibly
replaced).
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