Problem
Possible Causes
Likely Solutions
Tool will not start.
1. Cord not connected.
2. No power at outlet.
Internal damage or wear. (Carbon
brushes or switch, for example.)
1. Check that cord is plugged in.
2. Check power at outlet. If outlet is unpowered,
turn off tool and check circuit breaker.
If breaker is tripped, make sure circuit is right
capacity for tool and circuit has no other loads.
Have technician service tool.
Tool operates slowly. 1. Excess pressure applied to workpiece.
2. Power being reduced by long or small
diameter extension cord.
1.
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2. Eliminate use of extension cord.
If an extension cord is needed, use one with
the proper diameter for its length and load.
See
Extension Cords
in
GROUNDING
section.
Performance
decreases over time.
Carbon brushes worn or damaged.
Have qualified technician replace brushes.
Excessive noise
or rattling.
Internal damage or wear.
(Carbon brushes or bearings, for example.)
Have technician service tool.
Overheating.
1. Forcing tool to work too fast.
2.
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.
Motor being strained by long or
small diameter extension cord.
1. Allow tool to work at its own rate.
2. Wear ANSI-approved safety goggles and
NIOSH-approved dust mask/respirator while
blowing dust out of motor using compressed air.
Eliminate use of extension cord.
If an extension cord is needed, use one with
the proper diameter for its length and load.
See
Extension Cords
in
GROUNDING
section.
Follow all safety precautions whenever diagnosing or servicing
the tool. Disconnect power supply before service.
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motor housing to reveal the spring and brush assembly.
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Troubleshooting
