SECTION 5: SERVICE
Review the troubleshooting and procedures in this section to fix your machine if a problem develops. If you need replacement parts or you are unsure of your repair skills, then feel free to call our Technical Support at (570)
Troubleshooting
Motor & Electrical
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Motor will not start. | 1. | Low voltage. | 1. | Check power line for proper voltage. | ||||
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| 2. | Open circuit in motor or loose connections. | 2. | Inspect all lead connections on motor for loose or open |
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Motor will not start; | 1. | Short circuit in line cord or plug. | 1. | Inspect cord or plug for damaged insulation and shorted | ||||
fuses | or | circuit |
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breakers blow. |
| 2. | Short circuit in motor or loose connections. | 2. | Inspect all connections on motor for loose or shorted | |||
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| terminals or worn insulation. |
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| 3. | Incorrect fuses or circuit breakers in power line. | 3. | Install correct fuses or circuit breakers. |
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Motor overheats. | 1. | Motor overloaded. | 1. | Reduce load on motor. | ||||
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Motor stalls (result- | 1. | Short circuit in motor or loose connections. | 1. | Inspect connections on motor for loose or shorted termi- | ||||
ing in blown | fuses |
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or tripped circuit). | 2. | Low voltage. | 2 | Correct the low voltage conditions. | ||||
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| 3. | Incorrect fuses or circuit breakers in power line. | 3. | Install correct fuses or circuit breakers. |
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| 4. | Motor overloaded. | 4. | Reduce load on motor. |
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Machine | slows | 1. | Operator is using too much pressure. | 1. | Use less pressure when grinding. | |||
when operating. |
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Wavy |
| condi- | 1. | Machine vibrating. | 1. | Make sure machine is securely mounted on a solid sur- | ||
tion on | surface | of |
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workpiece. |
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| 2. | Workpiece not being held firmly. | 2. | Use a holding device to firmly retain the workpiece. | |
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| 3. | Wheel face uneven. | 3. | Dress the grinding wheel. |
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| 4. | Wheel is too hard. | 4. | Use softer wheel, or reduce the feed rate. |
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Lines on surface of | 1. | Impurity on wheel surface. | 1. | Dress the grinding wheel. | ||||
workpiece. |
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| 2. | Workpiece not being held tightly. | 2. | Use a holding device to firmly retain the workpiece. | |
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Burning |
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| spots | 1. | Improper type of grinding wheel. | 1. | Try a wheel which is softer style or a coarser grit. | |
or cracks | in | the | 2. | Improper feed rate. | 2. | Slow down the rate of movement of the workpiece into | ||
workpiece. |
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| wheel. | |
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| 3. | Coolant required. | 3. | Add optional coolant system or introduce coolant by |
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Wheel dulls quickly, | 1. | Depth of cut too great. | 1. | Slow down the rate of movement of the workpiece into | ||||
grit falls off. |
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| wheel. | |
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| 2. | Wheel is too soft. | 2. | Wheel too soft for the material being ground, select |
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| harder bond. |
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| 3. | Wheel diameter too small. | 3. | Replace the wheel. |
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| 4. | Bad wheel dress. | 4. | Dress the wheel. |
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| 5. | Defective wheel bonding. | 5. | Consult manufacturer of grinding wheel. |
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Wheel | clogs | and | 1. | Wheel is too hard. | 1. | Wheel too hard for the material being ground, select | ||
workpiece | shows |
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| softer bond. | |||
burn marks. |
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| 2. | Feed rate too slow. | 2. | Increase the rate of movement of the workpiece into | |
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| wheel. |
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| 3. | Bad wheel dress. | 3. | Dress the wheel. |
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| 4. | Coolant required. | 4. | Add optional coolant system or introduce coolant by |
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H7758/H7759 8" & 10" Bench Grinders |
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