TROUBLESHOOTING
South Bend Tools
For Machines Mfd. Since 3/21
Model SB1119/SB1120
-59-
TROUBLESHOOTING
If you need replacement parts, or if you are unsure how to do any of the solutions given here, feel free
to call us at (360) 734-1540.
Machine does not
start or power
supply breaker
trips immediately
after startup.
1.
STOP button depressed/at fault.
1.
Rotate STOP button to reset. Replace if at fault.
2.
Incorrect power supply voltage or
circuit size.
2.
Ensure correct power supply voltage and circuit size
(Page 14).
3.
Cabinet door open/door limit switch
at fault.
3.
Close door/replace limit switch.
4.
Power supply circuit breaker
tripped or fuse blown.
4.
Ensure circuit is free of shorts. Reset circuit breaker
or replace fuse.
5.
Motor wires connected incorrectly.
5.
Correct motor wiring connections (Pages 62
–
63).
6.
Contactor not energized/at fault.
6.
Test all legs for power; replace if necessary.
7.
Wiring broken, disconnected, or
corroded.
7.
Fix broken wires or disconnected/corroded
connections (Pages 62
–
63).
8.
ON button at fault.
8.
Test/replace button.
9.
FOR/REV switch at fault.
9.
Test/replace switch.
10.
Potentiometer/circuit board at fault.
10.
Inspect/test/replace if at fault.
11.
VFD at fault.
11.
Inspect VFD; replace if at fault.
12.
Motor or motor bearings at fault.
12.
Replace motor.
Machine stalls or is
underpowered.
1.
Workpiece material unsuitable for
machine.
1.
Only cut wood/ensure moisture is below 20%
(Page 25).
2.
Feed rate/cutting speed too fast.
2.
Decrease feed rate/cutting speed (Page 27).
3.
Workpiece crooked; fence loose or
misadjusted.
3.
Straighten or replace workpiece; adjust fence
(Page 31).
4.
Machine undersized for task.
4.
Use sharp cutter/reduce feed rate or depth of cut.
5.
Belt slipping/pulleys misaligned.
5.
Clean/tension/replace belt (Page 50); ensure
pulleys are aligned.
6.
Motor wires connected incorrectly.
6.
Correct motor wiring connections (Pages 62
–
63).
7.
Pulley/sprocket slipping on shaft.
7.
Tension/replace loose pulley/shaft.
8.
Motor overheated.
8.
Clean motor, let cool, and reduce workload.
9.
Extension cord too long.
9.
Move machine closer to power supply; use shorter
extension cord.
10.
Contactor not energized/at fault.
10.
Test all legs for power; repair/replace if at fault.
11.
FOR/REV switch at fault.
11.
Test/replace switch.
12.
Potentiometer/circuit board at fault.
12.
Inspect/test/replace if at fault.
13.
Motor or motor bearings at fault.
13.
Replace motor.
Symptom
Possible Cause
Possible Solution
Machine has
vibration or noisy
operation.
1.
Motor or component loose.
1.
Replace damaged or missing bolts/nuts or tighten if
loose.
2.
Machine feet not adjusted properly.
2.
Adjust machine feet to stabilize machine.
3.
V-belt worn, loose, pulleys
misaligned or belt slapping cover.
3.
Inspect/replace belt (Page 50). Align pulleys if
necessary (Page 55).
4.
Cutter, spindle, or spindle bearings
at fault.
4.
Replace cutter; tighten loose spindle; replace
defective spindle or spindle cartridge; replace
spindle bearings (Page 51).
5.
Elevation housing loose or
damaged.
5.
Tighten elevation housing gibs (Page 56); replace
cracked elevation housing.