Grizzly G7947 - Manual (Page 37)

G7947/G7948 12 Speed Floor Drill Press
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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. Start capacitor is faulty.
3. Motor connection is wired incorrectly.
4. Power supply is faulty, or is switched
OFF.
5. Safety switch key is at fault.
6. ON/OFF switch is faulty.
7. Cable or wiring is open or has high
resistance.
8. Motor is at fault.
1. Test power plug and receptacle for
good contact and correct wiring.
2. Replace capacitor.
3. Correct motor wiring (see
Page 41).
4. Make sure all hot lines and grounds are
operational and have correct voltage
on all legs.
5. Install or replace safety key, or replace
switch assembly.
6. Replace faulty switch.
7. Troubleshoot wires for internal or exter-
nal breaks, check for disconnected or
corroded connections and repair or
replace wiring.
8. Test, repair or replace motor.
Machine stalls or is underpowered. 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 41).
8. Replace loose pulley and shaft.
9. Rotate motor shaft for noisy or burnt
bearings, repair/replace as required.
10. Clean inside/outside of motor, let cool,
and reduce workload on machine.
11. Test, repair or replace motor.
Troubleshooting
Motor & Electrical