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Model G0517 Mill/Drill
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. Cable or wiring is open or has high
resistance.
3. Power supply is faulty, or is switched
OFF.
4. Safety switch key is at fault.
5. ON/OFF switch at fault.
6. Motor connection is wired incorrectly.
7. Motor is at fault.
1. Test power plug and receptacle for good contact and
correct wiring.
2. Troubleshoot wires for internal or external breaks,
check for disconnected or corroded connections and
repair or replace wiring, as necessary.
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. Correct motor wiring (see
Page 28).
7. Test, repair or replace motor.
Machine stalls or is under
-
powered.
1. Incorrect spindle speed or feed rate.
2. Machine is undersized for the task.
3. Bit or cutter is too large for machine.
4. Belts are slipping.
5. Plug or receptacle is at fault.
6. Pulley is slipping on shaft.
7. Low power supply voltage.
8. Motor bearings are at fault.
9. Motor has overheated.
10.Motor connection is wired incorrect
-
ly.
11. Motor is at fault.
1. Decrease spindle speed or feed rate.
2. Use smaller drill bits/cutters and reduce the feed rate
and spindle speed.
3. Use a smaller bit.
4. Replace bad belts, align pulleys, and re-tension.
5. Test power plug and receptacle for good contact and
correct wiring.
6. Replace loose pulley and shaft.
7. Make sure hot lines and grounds are operational w/
correct voltage.
8. Rotate motor shaft for noisy or burnt bearings, repair/
replace as required.
9. Clean dust off motor, let it cool, and reduce workload
on machine.
10.Correct motor wiring (see Page
28).
11.Test, repair or replace motor.
Troubleshooting
Motor & Electrical