JEFBGS06
150mm Bench Grinder
8. Troubleshooting Guide
Problem / Symptom
Cause
Action
Motor will not start.
1.
Low voltage
2.
Open circuit in motor or loose
connections
3.
Blown fuse or circuit breaker
1.
Check power source / ensure correct
voltage is used
2.
Inspect all cable connections on the
motor for loose or open connections. Send
for servicing.
3.
Ensure that circuit breaker and fuse are
compatible with power rating stated on
nameplate. Send for servicing.
Motor will not start - fuses or
circuit breakers tripping or
blowing.
1.
Short circuit in line, cord or
plug.
2.
Short circuit in motor or loose
connections.
3.
Incorrect fuses or circuit
breakers in the power line.
1.
Inspect the cord or plug for damaged
insulation and shorted wires.
2.
Inspect all connections on the motor
for loose or shorted terminals and/or worn
insulation.
3.
Install correct fuses or circuit breakers.
Move the tool onto a compatible circuit.
Motor overheating.
1.
Motor overloaded.
2.
Extension cable to long or not
heavy enough.
1.
Reduce load on the motor.
2.
Use a compatible extension cable for the
machine rating.
Motor stalling (resulting in blown
fuses or tripping).
1.
Short circuit in line, cord or
plug.
2.
Short circuit in motor or loose
connections.
3.
Incorrect fuses or circuit
breakers in the power line.
4.
Motor overloaded.
1.
Check power source / ensure correct
voltage is used
2.
Inspect all cable connections on the
motor for loose or open connections. Send
for servicing.
3.
Ensure that circuit breaker and fuse are
compatible with power rating stated on
nameplate. Send for servicing.
4.
Reduce load on the motor.
Machine slows while operating.
1.
Feed rate is too high
1.
Reduce the feed rate to the grinding
wheel.
JEFBGS06
150mm Bench Grinder
8. Troubleshooting Guide (continued)
Problem / Symptom
Cause
Action
Wavy patterning on the surface of
the workpiece.
1.
Machine vibrating.
2.
Workpiece not being held
firmly.
3.
Uneven wheel face.
4.
Wheel is too hard.
1.
Ensure that the wheel is securely
mounted on a solid surface.
2.
Use a holding device to retain the
workpiece firmly.
3.
Dress the grinding wheel.
4.
Use a softer wheel or reduce the feed
rate.
Lines on the surface of the
workpiece.
1.
Impurity on the wheel surface.
2.
Workpiece not being held
firmly.
1.
Dress/clean the grinding wheel.
2.
Use a softer wheel or reduce the feed
rate.
Burning spots or cracks on the
workpiece.
Wheel is dull / clogged.
1.
Incorrect grinding wheel.
2.
Incorrect feed rate.
3.
Coolant required.
1.
Use wheel with softer bond or coarser
grit.
2.
Reduce feed rate.
3.
Use coolant more regularly.
4. Dress / clean / replace the wheel.
9.
10.
