Troubleshooting - Grizzly G9729 Instruction Manual

Symptom
Motor will not start.
Motor will not start; fuses or circuit break-
ers blow.
Motor fails to develop full power (output
of motor decreases rapidly with decrease
in voltage at motor terminals).
Motor overheats.
Table hard to move.
Breaking tools, cutters.
Workpiece vibrates or chatters during
operation.
Loud repetitious noise coming from
machine.
Bad surface finish.
G9729 Combination Lathe/Mill

Troubleshooting

Possible Cause
1. Low voltage.
2. Open circuit in motor or loose connec-
tions.
3. Faulty start capacitor.
1. Short circuit in line cord or plug.
1. Power line overloaded with lights, appli-
ances, and other motors.
2. Undersized wires or circuits too long.
1. Motor overloaded.
2. Air circulation through the motor
restricted.
1. Table locks are tightened down.
2. Chips have loaded up on bedways.
3. Bedways are dry and in need of lubri-
cation.
4. Longitudinal stops are interfering.
5. Gibs are too tight.
1. RPM and or feed rate is too fast.
2. Cutter getting too hot.
3. Taking too big of a cut.
1. Table locks not tight.
2. Spindle lock not tight.
3. Workpiece not securely clamped to
table or into mill vice.
4. RPM and feed rate too high.
1. Pulley set screws or keys are missing
or loose.
2. Motor fan is hitting the cover.
3. V-belts are defective.
1. Wrong RPM or feed rate.
2. Dull cutter or poor cutter selection.
3. Wrong rotation of cutter.
Possible Solution
1. Check power line for proper voltage.
2. Inspect all lead connections on motor
for loose or open connections.
3. Replace start capacitor.
1. Repair or replace cord or plug for dam-
aged insulation and shorted wires.
1. Reduce load on power line.
2. Increase wire sizes or reduce length of
the circuit.
1. Reduce load on motor.
2. Clean out motor to provide normal air
circulation.
1. Check to make sure table locks are
fully released.
2. Frequently clean away chips that load
up during milling operations.
3. Lubricate bedways and handles.
4. Check to make sure that stops are
floating and not hitting the center stop.
5. Loosen gib screw(s).
1. Use tables to set correct RPM and feed
rates.
2. Use cutting fluid or oil for appropriate
application.
3. Lessen depth of cut and allow chips to
clear.
1. Tighten down table locks.
2. Tighten spindle lock.
3. Check that clamping is tight and suf-
ficient for the job. Make sure mill vice
is tight to the table.
4. Use appropriate RPM and feed for the
job.
1. Inspect keys and set screws. Replace
or tighten if necessary.
2. Adjust fan cover mounting position,
tighten fan, or shim fan cover.
3. Replace V-belts.
1. Adjust for appropriate RPM and feed
rate.
2. Sharpen cutter or select a better cutter
for the intended operation.
3. Check for proper cutting rotation for
cutting tool.
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