G8689 Mini Mill (Mfg. 8/06+)
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This section is provided for your convenience—it is not a substitute for the Grizzly Service Department. If
any adjustments arise that are not described in this manual, you need replacement parts, or you are unsure
of how to perform the procedures in this section, then feel free to call our Technical Support line.
SECTION 7: SERVICE
About Service
Symptom
Possible Cause
Possible Solution
Motor will not start.
1. Low voltage.
2. Open circuit in motor or loose
connections.
3. Blow system fuse.
1. Check power line for proper voltage.
2. Inspect all lead connections on motor
for loose or open connections.
3. Replace fuse.
Motor will not start; fuses or circuit
breakers blow.
1. Short circuit in line cord or plug.
1. Repair or replace cord or plug for
damaged insulation and shorted
wires.
Motor shuts off unexpectedly.
1. Motor is overloaded due to high feed
rate.
2. Thermal
protection
unit
is
overheated.
1. Reduce feed rate and amount of
material removed.
2. Wait for system to cool down.
Motor overheats.
1. Motor overloaded.
2. Air circulation through the motor
restricted.
3. Motor brushes are wearing.
1. Reduce load on motor.
2. Clean out motor to provide normal air
circulation.
3. Inspect motor brushes, replace if
necessary.
Motor stalls (resulting in blown fuses or
tripped circuit).
1. Short circuit in motor or loose
connections.
2. Low voltage.
3. Incorrect fuses or circuit breakers in
power line.
4. Motor overloaded.
1. Repair or replace connections on
motor for loose or shorted terminals
or worn insulation.
2. Correct the low voltage conditions.
3. Install correct fuses or circuit
breakers.
4. Reduce load on motor.
Cutter slows when cutting.
1. Brushes worn.
1. Replace brushes (
page 30).
Poor surface finishes.
1. Feed rate to fast.
2. Dull cutter.
3. Lock not tightened down.
4. Gibs loose.
1. Slow feed rate.
2. Always use newly sharpened cutters.
3. Tighten column and table locks when
possible to maintain rigidity.
4. Adjust gibs.
Vibration when running or cutting.
1. Loose table.
2. Loose gibs.
3. Feed rate too high.
1. Tighten table locks.
2. Adjust gibs.
3. Slow feed rate or adjust RPM.
Difficulty removing collet from spindle.
1. Debris in spindle taper or collet taper
or both.
2. Head not locked in position.
1. Keep all taper surfaces spotlessly
clean.
2. Lock head in place on column
Troubleshooting
Summary of Contents for G8689
Page 15: ...G8689 Mini Mill Mfg 8 06 13 Hardware Recognition Chart...
Page 40: ...38 G8689 Mini Mill Mfg 8 06...
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