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troubleshooting
SECTION 7: SERVICE
Review the troubleshooting and procedures in this section to fix or adjust your machine if a problem devel-
ops. If you need replacement parts or you are unsure of your repair skills, then feel free to call our Technical
Support at (570) 546-9663.
Motor & Electrical
Symptom
Possible Cause
Machine does not
1. Power connection is at fault or wired incor-
start or a breaker
rectly.
trips.
2. Motor connection wired incorrectly.
3. Wall fuse/circuit breaker is blown/tripped.
4. Power supply switched OFF or is at fault.
5. Wiring is open/has high resistance.
6. Forward/reverse switch at fault.
7. Motor is at fault.
Machine stalls or is
1. Feed rate/cutting speed too fast for task.
overloaded.
2. Workpiece alignment is poor.
3. Wrong workpiece material.
4. Incorrect spindle speed for workpiece.
5. Motor connection is wired incorrectly.
6. Belt(s) slipping.
7. Belt pulley(s)/shaft or spindle speed range
gearing is at fault.
8. Machine is overloaded for task.
9. Motor is overheated.
10. Motor is at fault.
Model G9901/G9902/G9903 Milling Machine
Troubleshooting
Possible Solution
1. Test for good contacts; correct the wiring.
2. Correct motor wiring connections.
3. Ensure circuit size is suitable for this machine;
replace weak breaker.
4. Ensure power supply is switch ON; ensure power
supply has the correct voltage.
5. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
6. Replace faulty switch.
7. Test/repair/replace motor.
1. Decrease feed rate/cutting speed.
2. Eliminate workpiece binding; use jig or clamps and
position table properly for workpiece alignment con-
trol.
3. Use metal with correct properties for your type of
machining.
4. Select correct spindle speed (see Page 32).
5. Correct motor wiring connections.
6. Replace bad belt(s) and re-tension (see Page 52 &
53).
7. Replace belt pulley(s)/shaft or spindle speed range
gearing.
8. Use smaller sharp cutters/drill bits; reduce the feed
rate; reduce the spindle RPM; use cutting fluid if pos-
sible.
9. Clean off motor, allow to cool, and reduce work-
load.
10. Test/repair/replace motor.
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