Southbend 13" Heavy 13 Gearhead lathe SB - Manual (Page 86)

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For Machines Mfg. Since 5/11 13" Heavy 13 ® Gearhead Lathe TR O U B L E S H O OTI N G
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.
Symptom Possible Cause Possible Solution
Machine does not
start or a circuit
breaker trips. 1. (First time operation only) Lathe is
wired out of phase. 1. Swap two hot wire connections on master switch
(see Page 25).
2. STOP button is engaged or at fault. 2. Rotate button clockwise until it pops out to reset it
for operation; replace if not working properly.
3. Spindle switch(es) are at fault. 3. Replace bad switch(es).
4. Power supply is switched OFF at
master power switch or breaker. 4. Make sure master power switch and circuit breaker
are turned ON.
5. Wall fuse/circuit breaker is blown/
tripped; short in electrical system;
start-up load too high for circuit. 5. Verify circuit is rated for machine amp load;
troubleshoot and repair cause of overload; replace
weak breaker; find/repair electrical short.
6. Fuse has blown in machine
electrical box. 6. Replace fuse; determine if overload is due to heavy
operation; ensure power source has high enough
voltage and power cord is correctly sized.
7. One or more safety switches or
brake switch are engaged. 7. Verify electrical box door, chuck guard, spindle, and
brake switches are not engaged.
8. Thermal overload relay has tripped. 8. Turn the thermal relay cut-out dial to increase
working amps and push the reset pin. Replace if
tripped multiple times (weak relay).
9. Motor connection wired incorrectly. 9. Correct motor wiring connections.
10. Safety/brake switch(es) at fault. 10. Test all switches and replace as necessary.
11. Contactor not getting energized/has
burned contacts. 11. Test for power on all legs and contactor operation.
Replace unit if faulty.
12. Wiring is open/has high resistance. 12. Check for broken wires or disconnected/corroded
connections, and repair/replace as necessary.
13. Motor is at fault. 13. Test/repair/replace.
Loud, repetitious
noise coming from
lathe at or near the
motor. 1. Pulley set screws or keys are
missing or loose. 1. Inspect keys and set screws. Replace or tighten if
necessary.
2. Motor fan is hitting the cover. 2. Tighten fan, shim cover, or replace items.
Motor overheats. 1. Motor overloaded. 1. Reduce load on motor.
Motor is loud when
cutting, or bogs
down under load. 1. Excessive depth of cut or feed rate. 1. Decrease depth of cut or feed rate.
2. Spindle speed or feed rate wrong for
cutting operation. 2. Refer to the feeds and speeds charts in
Machinery's Handbook or a speeds and feeds
calculator on the internet.
3. Cutting tool is dull. 3. Sharpen or replace the cutting tool.