TROUBLESHOOTING
South Bend Tools
For Machines Mfd. Since 11/21
Model SB1125
-41-
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 a breaker
trips immediately
after startup.
1.
Master power switch in OFF (0)
position.
1.
Turn master power switch to ON (1) position.
2.
EMERGENCY STOP button
depressed/at fault.
2.
Rotate EMERGENCY STOP button head to reset.
Replace if at fault.
3.
Blown machine fuse.
3.
Replace fuse/ensure no shorts.
4.
Incorrect power supply voltage or
circuit size.
4.
Ensure correct power supply voltage and circuit size
(Page 11).
5.
Power supply circuit breaker
tripped or fuse blown.
5.
Ensure circuit is free of shorts. Reset circuit breaker
or replace fuse.
6.
Motor wires connected incorrectly.
6.
Correct motor wiring connections.
7.
Wiring broken, disconnected, or
corroded.
7.
Fix broken wires or disconnected/corroded
connections.
8.
ON/OFF switch at fault.
8.
Replace switch.
9.
Spindle rotation switch at fault.
9.
Test/replace switch.
10.
VFD/inverter at fault.
10.
Test/replace VFD/inverter.
11.
Motor or motor bearings at fault.
11.
Replace motor.
Machine has
vibration or noisy
operation.
1.
Motor or component loose.
1.
Replace damaged or missing bolts/nuts or tighten if
loose.
2.
V-belt(s) worn, loose, pulleys
misaligned, or belt slapping cover.
2.
Inspect/replace belts with a new matched set (Page
37). Realign pulleys if necessary (Page 39).
3.
Pulley loose.
3.
Secure pulley on shaft.
4.
Motor mount loose/broken.
4.
Tighten/replace.
5.
Spindle loose, improperly installed,
or damaged.
5.
Tighten loose spindle; re-install spindle, ensuring
mating surfaces are clean; replace spindle if
damaged.
6.
Workpiece loose.
6.
Use correct holding fixture and reclamp workpiece.
7.
Motor fan rubbing on fan cover.
7.
Fix/replace fan cover; replace loose/damaged fan.
8.
Chuck or bit/cutter at fault.
8.
Replace unbalanced chuck; replace/resharpen bit/
cutter; use correct feed rate.
9.
Spindle bearings at fault.
9.
Test by rotating spindle; rotational grinding/loose
shaft requires bearing replacement.
10.
Motor bearings at fault.
10.
Replace motor.
Machine stalls or is
underpowered.
1.
Dull bit/cutter.
1.
Sharpen bit/cutter or replace.
2.
Machine undersized for task.
2.
Use correct bit/cutter; reduce feed rate; reduce
spindle speed (Page 25); use cutting fluid if
possible.
3.
Belt(s) slipping/pulleys misaligned.
3.
Clean/tension/replace belt(s) (Page 37); ensure
pulleys are aligned (Page 39).
4.
Pulley slipping on shaft.
4.
Tighten/replace loose pulley/shaft.
5.
Motor overheated.
5.
Clean motor, let cool, and reduce workload.
6.
Extension cord too long.
6.
Move machine closer to power supply; use shorter
extension cord.
7.
Spindle rotation switch at fault.
7.
Test/replace switch.
8.
Motor or motor bearings at fault.
8.
Replace motor.
Symptom
Possible Cause
Possible Solution