Grizzly H7757, Owner'S Manual, Page: 19 / 24

Model H7757 3" Mini Wool Buffer -17
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SECTION 6: SERVICE
Troubleshooting
Symptom Possible Cause Possible Solution
Machine slows
when operating. 1. Workpiece pressure is too
great.
1. Reduce workpiece pressure on
wheel.
Machine vibrates
when operating. 1. Grinding wheel is unbal-
anced.
2. Grinding wheel is damaged.
3. Arbor is bent.
4. Bearings are worn or dam-
aged.
1. Adjust or tighten wheel mounting
nut as necessary.
2. Replace the wheel.
3. Inspect arbor and replace if nec-
essary.
4. Inspect bearings and replace if
necessary.
Wavy condition
on surface of
workpiece. 1. Workpiece not being held
firmly.
2. Wheel face uneven.
3. Wheel is too hard.
1. Use a holding device to firmly
retain the workpiece.
2. Dress the grinding wheel.
3. Use softer wheel.
Lines on surface
of workpiece. 1. Impurity on wheel surface.
2. Workpiece not being held
tightly.
1. Dress the grinding wheel.
2. Use a holding device to firmly
retain the workpiece.
Burning spots
or cracks in the
workpiece. 1. Workpiece pressure is too
great.
2. Improper grinding wheel
type.
3. Coolant required.
1. Reduce workpiece pressure on
wheel.
2. Try a wheel that is of a softer style
or coarser grit.
3. Cool the workpiece frequently.
Wheel dulls
quickly, grit falls
off.
1. Workpiece pressure is too
great.
2. Wheel is too soft.
3. Wheel diameter too small.
4. Bad wheel dress.
5. Defective wheel bonding.
1. Reduce workpiece pressure on
wheel.
2. Select a wheel with a harder
bond.
3. Replace the wheel.
4. Dress the wheel.
5. Consult manufacturer of grinding
wheel.
Wheel clogs and
workpiece shows
burn marks. 1. Wheel is too hard.
2. Feed rate too slow.
3. Bad wheel dress.
4. Coolant required.
1. Select a softer wheel bond.
2. Increase rate of movement of
workpiece onto wheel.
3. Dress the wheel.
4. Cool the workpiece frequently.
Poor buffing per-
formance. 1. Buffing wheel is loaded with
compound residue.
2. Buffing wheel is worn down.
1. Clean wheel with a buffing rake as
on Page 11 .
2. Replace buffing wheel.