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TROUBLESHOOTING
Problem Possible Causes Probable Solutions
Tool will not start. No power at outlet.1.
Cord not connected.2.
Blown fuse or tripped circuit 3.
breaker.
Check power at outlet.1.
Check that cord is plugged in.2.
Replace fuse or reset circuit breaker.3.
Motor does not
rotate with power
switch depressed.
Disrupted power supply.1.
Poor contact at the switch.2.
Armature or eld coil burnt.3.
Broken stator coil.4.
Carbon brushes worn out.5.
Check power supply.1.
Repair switch.2.
Change coil.3.
Replace stator coil.4.
Replace carbon brushes.5.
Abnormal noise
from motor. Does
not rotate, or
rotates slowly.
Overload of motor caused by
excessive drilling pressure.
Reduce drilling pressure. Decrease force.
Partial short
circuit.
Partial short circuit or open circuit
at armature.
Repair or change armature.
Main voltage too
low.
Main power voltage too low. Adjust main power voltage.
Gearbox becomes
too hot.
Overload. Dull bit.1.
Damp coils.2.
Incorrect tting.3.
Decrease in voltage.4.
Reduce load. Sharpen bit.1.
Dry coils.2.
Repair or change armature.3.
Adjust voltage.4.
Sparking. Short circuit or break at 1.
armature.
Surface of armature not 2.
smooth and clean.
New carbon brushes installed.3.
Repair armature. 1.
Inspect and clean armature. 2.
Normal condition. Sparking will discontinue 3.
once new carbon brushes are worn ush
with the armature.