Grizzly G9986 - Manual (Page 21)

Model G9986 8" Drill Press
-19-
This section is provided for your convenience—it is not a substitute for the Grizzly Service Department. If
you need help troubleshooting, you need replacement parts, or you are unsure of how to perform the pro-
cedures in this section, then feel free to call our Technical Support at (570) 546-9663.
SECTION 7: SERVICE
About Service
Symptom Possible Cause Possible Solution
Machine does not start or a
breaker trips. 1. Plug or receptacle is at fault or wired
incorrectly.
2. Motor connection is wired incorrectly.
3. Power supply is faulty, or is switched
OFF.
4. Safety switch key is at fault.
5. ON/OFF switch is faulty.
6. Cable or wiring is open or has high
resistance.
7. Motor is at fault.
1. Test power plug and receptacle for good contact and
correct wiring.
2. Correct motor wiring (see Page 23).
3. Make sure all hot lines and grounds are operational
and have correct voltage on all legs.
4. Install or replace safety key, or replace switch assem-
bly.
5. Replace faulty switch.
6. Troubleshoot wires for internal or external breaks,
check for disconnected or corroded connections and
repair or replace wiring.
7. Test, repair or replace motor.
Machine stalls or is under-
powered. 1. Incorrect spindle speed for task.
2. Machine is undersized for the task.
3. Bit or cutter is dull.
4. Low power supply voltage.
5. Belt(s) is slipping.
6. Plug or receptacle is at fault.
7. Motor connection is wired incorrectly.
8. Pulley is slipping on shaft.
9. Motor bearings are at fault.
10. Motor has overheated.
11. Motor is at fault.
1. Decrease spindle speed.
2. Use smaller drill bits/cutters and reduce the feed rate
and spindle speed.
3. Sharpen/replace bit or cutter.
4. Make sure hot lines and grounds are operational w/
correct voltage.
5. Replace bad belts, align pulleys, and re-tension.
6. Test power plug and receptacle for good contact and
correct wiring.
7. Correct motor wiring (see Page 23).
8. Replace loose pulley and shaft.
9. Rotate motor shaft for noisy or burnt bearings, repair/
replace as required.
10. Clean dust off motor, let it cool, and reduce workload
on machine.
11. Test, repair or replace motor.
Troubleshooting
Motor & Electrical