South Bend Tools
For Machines Mfd. Since 10/20
Model SB1093
-39-
TROUBLESHOOTING
Symptom
Possible Cause
Possible Solution
Machine has
excessive vibration
or noise or noisy
operation.
1.
Motor or component loose.
1.
Fix/replace fan cover; replace loose or damaged fan.
2.
Mobile base lock knobs loose or
stand feet not adjusted properly.
2.
Tighten mobile base lock knobs or adjust stand feet
to stabilize machine.
3.
V-belt worn or not tensioned
properly.
3.
Inspect/replace/tension V-belt (
Page 36
).
4.
Motor mount loose/broken.
4.
Tighten/replace.
5.
Sanding disc out of balance or loose.
5.
Tighten disc hub or replace disc.
6.
Motor fan rubbing on fan cover.
6.
Fix/replace fan cover; replace loose/damaged fan.
7.
Pulley loose or not in alignment;
shaft bent.
7.
Replace worn pulley, key, and shaft, and realign.
8.
Motor bearings at fault.
8.
Test by rotating shaft; rotational grinding/loose
shaft requires bearing replacement.
Sanding belt will
not track properly.
1.
Sanding belt is not tensioned
properly.
1.
Tension sanding belt (
Page 30
).
2.
Sanding belt is stretched unevenly.
2.
Replace sanding belt (
Page 30
).
3.
Belt roller is worn.
3.
Replace belt roller.
Sanding belt slips
during use.
1.
Sanding belt is not tensioned
properly.
1.
Tension sanding belt (
Page 30
).
2.
Excessive workpiece pressure.
2.
Reduce workpiece pressure against sanding belt.
3.
V-belt is worn or not tensioned
properly.
3.
Inspect/tension V-belt (
Page 36
).
Sanding disc slips
during use.
1.
V-belt is worn or not tensioned
properly.
1.
Inspect/tension V-belt (
Page 36
).
2.
Disc shaft key is missing or broken.
2.
Inspect/replace disc shaft key.
Excessive sanding
belt or disc
replacement.
1.
Not using full width of sanding
surface.
1.
Move workpiece back and forth across sanding
surface (
Sanding Tips
on
Page 24
).
2.
Excessive workpiece pressure.
2.
Reduce workpiece pressure.
Deep sanding
grooves or scars in
workpiece.
1.
Sandpaper too coarse for desired
finish.
1.
Use a finer grit sandpaper (
Page 24
).
2.
Workpiece sanded across grain.
2.
Sand workpiece with grain.
3.
Excessive pressure.
3.
Reduce workpiece pressure against sanding surface.
4.
Workpiece held still against belts/
disc.
4.
Move workpiece back and forth across sanding
surface.
Burn marks on
workpiece.
1.
Using too fine of sanding grit.
1.
Use coarser grit sandpaper (
Page 24
).
2.
Excessive pressure on workpiece.
2.
Reduce pressure on workpiece while sanding.
3.
Workpiece held still for too long.
3.
Move workpiece back and forth across sanding
surface.
