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18
Symptom Possible Cause Correction
Motor stalls (cont.)
Short circuit in motor or loose
connections.
Inspect connections on motor for loose or
shorted terminals or worn insulation.
Low voltage. Correct the low voltage conditions.
Incorrect fuses or circuit breakers in
power line.
Install correct fuses or circuit breakers.
Motor slows. Motor overloaded. Reduce load to motor; do not press so
hard.
Low line voltage. Check power line for proper voltage.
Loose connections. Inspect connections.
Frequent fuse or circuit
breaker failure.
Motor overload. Reduce load to motor; do not press so
hard.
Electrical circuit overload; too many
electrical machines running on same
circuit.
Turn off other machines and try again.
Incorrect fuse or circuit breaker. Have electrician upgrade service to outlet.
Excessive vibration. Wheel out of balance; wobbling or
not rotating concentric to arbor.
Dress wheel or replace it. Adjust wobble
by rotating flange as needed.
Improper mounting. Secure grinder/sander firmly to bench or
stand.
Sanding belt refuses to
track correctly.
Sanding belt stretched unevenly. Replace sanding belt.
V-belt worn. Replace v-belt.
Wheel worn. Replace wheel.
Sanding belt will not
tension or de-tension
properly.
Tension rod is “sticking”; movement
obstructed.
Clean any debris from tension rod and
spring area. Lubricate spring if needed.
Spring is worn or damaged. Replace spring.
Set screw which holds tension rod to
wheel carrier is loose.
Tighten set screw.
Sanding belt slips or
stalls when pressure is
applied.
Abrasive belt tension inadequate. Tighten sanding belt.
Excessive pressure being applied to
belt.
Reduce pressure.
Frequent replacement
of sanding belt.
Too much pressure being applied to
work piece.
Reduce pressure on work piece.
Full width of belt not being used. Stroke across sanding belt using full width
of belt surface.
Abrasive separates
from disc.
Improper bonding. Remove sanding disc and clean residual
adhesive from metal disc. Mount new
adhesive-backed abrasive.
Table 3
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