SECTION 4 – MAINTENANCE AND TROUBLESHOOTING

4-1. Routine Maintenance

Y Disconnect power before maintaining.

3 Months

Replace unreadable labels.

Repair or replace cracked weld cable.

Clean and tighten weld terminals.

6 Months

Blow out or vacuum inside. During heavy service clean monthly.

OR

4-2. Troubleshooting

 

 

 

 

 

 

 

 

 

 

 

Trouble

 

 

Remedy

 

 

No weld output; fan does not run.

Be sure line disconnect switch is in On position.

 

 

 

 

 

Check and replace line fuses if open. Reset breakers if necessary.

 

 

Fan does not run; weld output okay.

Be sure nothing is blocking movement of fan. If fan does not run freely, replace fan motor.

 

 

Erratic weld current.

Clean and tighten all weld cable connections.

 

 

Erratic arc with excessive spatter.

Use dry, properly stored electrodes.

 

 

 

 

 

Shorten arc length.

 

 

 

 

 

Reduce amperage setting.

 

 

Electrode freezing to work.

Increase amperage setting.

 

 

 

 

 

Increase arc length.

 

 

 

 

 

Use dry, properly stored electrodes.

 

 

 

 

 

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Miller Electric 340, 440 Maintenance and Troubleshooting, Routine Maintenance, Months, Disconnect power before maintaining