Grizzly G0779 ユーザーズマニュアル

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Model G0779 (Mfd. Since 09/14)

Review the troubleshooting and procedures in this section if a problem develops with your machine. If you 
need replacement parts or additional help with a procedure, call our Technical Support. 

Note: Please gather 

Machine does not 
start or a breaker 
trips.

1.  Incorrect power supply voltage or incoming 

wire connections.

2.  Power supply circuit breaker tripped or fuse 

blown. 

3.  Motor wires connected incorrectly.
4.  Wiring open/has high resistance.
5.  Start capacitor at fault.
6.  Spindle rotation switch at fault. 
7.  Centrifugal switch/contact points at fault.

8.  Motor at fault.

1.  Ensure correct power supply voltage and incoming 

wire connections.

2.  Ensure circuit is sized correctly and free of shorts. 

Reset circuit breaker or replace fuse.

3.  Correct motor wiring connections.
4.  Check/fix broken, disconnected, or corroded wires.
5.  Test/replace.
6.  Test/replace switch. 
7.  Adjust/replace centrifugal switch/contact points if 

available.

8.  Test/repair/replace.

Machine stalls or is 
underpowered.

1.  Machine undersized for task.

2.   Wrong workpiece material (metal).
3.  Motor overheated.
4.  Motor wired incorrectly.
5.  Plug/receptacle at fault.
6.  Gearbox at fault.

7.  Run capacitor at fault.
8.  Centrifugal switch/contact points at fault.
9.  Motor bearings at fault.
10. Spindle rotation switch at fault.

1.  Use correct cutter/bit; reduce feed rate; reduce 

spindle RPM; use coolant if possible.

2.   Use correct type/size of metal.
3.  Clean motor, let cool, and reduce workload.
4.  Wire motor correctly.
5.  Test for good contacts/correct wiring.
6.  Select appropriate gear ratio; replace broken or 

slipping gears.

7.  Test/repair/replace.
8.  Adjust/replace centrifugal switch or contact plate.
9.  Test/repair/replace.
10. Test/replace switch.

Machine has 
vibration or noisy 
operation.

1.  Motor or component loose.

2.  Chuck or cutter at fault.
3.   Motor fan rubbing on fan cover.
4.  Motor mount loose/broken.
5.  Machine incorrectly mounted/secured to 

floor.

6.   Motor or spindle bearings at fault.

7.  Centrifugal switch is at fault.

1.  Inspect/replace damaged bolts/nuts, and retighten 

with thread locking fluid.

2.  Replace unbalanced chuck; replace/resharpen 

cutter; use correct feed rate.

3.  Fix/replace fan cover; replace loose/damaged fan.
4.  Tighten/replace.
5.  Tighten mounting bolts; relocate/shim machine.
6.  Test by rotating shaft; rotational grinding/loose shaft 

requires bearing replacement.

7.  Replace.