Southbend SB1053 owner manual Tr O U B L E S H O Oti N G

16-Speed Gearhead Lathe TR O U B L E S H O OTI N G For Machines Mfg. Since 3/11

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.

2.Stop button is engaged or at fault.

3.Spindle switch(es) are at fault.

4.Power supply is switched OFF at master power switch or breaker.

5.Wall fuse/circuit breaker is blown/ tripped; short in electrical system; start-up load too high for circuit.

6.Fuse has blown in machine electrical box.

7.One or more safety switches or brake switch are engaged.

8.Thermal overload relay has tripped.

9.Motor connection wired incorrectly.

10.Safety/brake switch(es) at fault.

11.Contactor not getting energized/has burned contacts.

12.Wiring is open/has high resistance.

13.Motor is at fault.

1.Correct out-of-phase wiring (refer to Page 90 for details).

2.Rotate button clockwise until it pops out to reset it for operation; replace if not working properly.

3.Replace bad switch(es).

4.Make sure master power switch and circuit breaker are turned ON.

5.Verify circuit is rated for machine amp load; troubleshoot and repair cause of overload; replace weak breaker; find/repair electrical short.

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.Verify electrical box door, chuck guard, spindle, and brake switches are not engaged.

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.Correct motor wiring connections.

10.Test all switches and replace as necessary.

11.Test for power on all legs and contactor operation. Replace unit if faulty.

12.Check for broken wires or disconnected/corroded connections, and repair/replace as necessary.

13.Test/repair/replace.

Loud, repetitious	1.	Pulley set screws or keys are	1.	Inspect keys and set screws. Replace or tighten if
noise coming from		missing or loose.		necessary.
lathe at or near the	2.	Motor fan is hitting the cover.	2.	Tighten fan, shim cover, or replace items.
motor.
Motor overheats.	1.	Motor overloaded.	1.	Reduce load on motor.
Motor is loud when	1.	Excessive depth of cut or feed rate.	1.	Decrease depth of cut or feed rate.
cutting, or bogs	2.	Spindle speed or feed rate wrong for	2.	Refer to the feeds and speeds charts in
down under load.
		cutting operation.		Machinery's Handbook or a speeds and feeds
				calculator on the internet.
	3.	Cutting tool is dull.	3.	Sharpen or replace the cutting tool.

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