Product Manual

16
10.0 Troubleshooting JMD-45VS series Mill-Drills
Table 5
Symptom Possible Cause Correction*
Motor will not start. Low voltage. Check power line for proper voltage.
Open circuit in motor or loose
connection.
Inspect all lead connections on motor for
loose or open connections.
Switch failure. Inspect switch, replace if needed.
Motor fault. Repair or replace motor.
Motor will not start:
fuses blow or circuit
breakers trip.
Short circuit in line cord or plug. Inspect cord or plug for damaged
insulation and shorted wires.
Short circuit in motor or loose
connections.
Inspect all connections on motor for loose
or shorted terminals or worn insulation.
Incorrect fuses or circuit breakers in
power line.
Install correct fuses or circuit breakers.
Drawing higher amperage than plug
can supply.
Install proper plug, or hardwire machine to
service panel.
Incorrect power supply. Confirm that incoming power matches
characteristics of machine.
Motor overheats. Motor overloaded. Decrease feed pressure to reduce load on
motor.
Air circulation through motor is
restricted.
Clean motor fan with compressed air to
restore normal air circulation.
Prolonged operation at higher
speeds.
Allow machine to cool.
Motor fault. Repair or replace motor.
Motor stalls, or doesn’t
build to normal
operating speed.
Motor overloaded. Reduce feed rate.
Dull drill bit or mill cutter. Keep tools sharp.
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 fault. Repair or replace motor.
Spindle turns, but with
loss of power.
Applying too much downfeed
pressure.
Slow downfeed.
Low voltage. Correct the low voltage conditions.
Motor fault. Repair or replace motor.
Spindle/bearing runs
hot.
Prolonged operation at higher
speeds.
Allow machine to cool.
Insufficient spindle lubrication. Make sure machine is properly lubricated.
Poor cut performance. Dull bit or cutting tool. Sharpen or replace.
Drill chuck loose Secure chuck in spindle.
Workpiece not secured to table. Tighten down workpiece. Use proper vise
or jig for irregularly shaped pieces.
Arbor not secured in spindle. Adjust tightness with drawbar.
Spindle runout or loosening due to
bearing misadjustment or failure.
Inspect spindle elements, such as
bearings and lock nuts; adjust or replace.