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G9749 Variable Speed Drill Press
-27-
This section is provided for your convenience—it is not a substitute for the Grizzly Service Department. If
you need help troubleshooting, need replacement parts, or are unsure how to perform the procedures 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. Rotary switch at fault.
5. Motor connection is wired incor
-
rectly.
6. 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. Replace faulty switch.
5. Correct motor wiring (see Wiring Diagram
on Page
30).
6. Test, repair or replace motor.
Machine stalls or is under
-
powered.
1. Incorrect drilling speed or feed
rate.
2. Machine is undersized for the task.
3. Bit or cutter is too large for
machine.
4. Belt is slipping.
5. Plug or receptacle is at fault.
6. Pulley is slipping on shaft.
7. Motor bearings are at fault.
8. Motor has overheated.
9. Motor connection is wired incor
-
rectly.
10. Motor is at fault.
1. Decrease drilling speed or feed rate.
2. Use smaller drill bits/cutters and reduce the feed
rate and spindle speed.
3. Use a smaller bit or cutter.
4. Replace, realign, or re-tension belt.
5. Test power plug and receptacle for good contact
and correct wiring.
6. Replace loose pulley and shaft.
7. Rotate motor shaft for noisy or burnt bearings,
repair/replace as required.
8. Clean dust off motor, let it cool, and reduce work
-
load on machine.
9. Correct motor wiring (see Wiring Diagram
on Page
30).
10. Test, repair or replace motor.
Troubleshooting
Motor & Electrical