| TROUBLEShOOTING |
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| Observe all Safety Guidelines detailed throughout this manual |
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| PROBLEMS | POSSIBLE CAUSE | REMEDY |
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| (SYMPTOMS) |
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| PROBLEMS |
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Drive rolls turn, but wire will not feed | 1. Gun cable kinked and/or twisted. | 1. Keep as straight as possible. | ||||
or wire feeding is rough. |
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| Inspect cable and replace if | nec- | |
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| essary. |
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| 2. Wire jammed in gun and cable. | 2. Remove wire from gun and cable | |||
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| – feed in new wire. Note any | |
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| obstruction. Replace liner if | nec- |
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| essary. |
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| 3. Incorrect | drive rolls | and guide | 3. Be sure the wire diameter being | |
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| tubes. |
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| used is stamped on drive rolls and | |
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| guide tubes. Replace if neces- | |
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| sary. |
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| 4. Gun cable liner dirty. |
| 4. Clean liner or replace. |
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| 5. Worn drive rolls. |
| 5. Replace or reverse split drive roll | ||
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| type. |
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| 6. Electrode rusty and/or dirty. | 6. Replace the electrode if it is rusty. | |||
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| 7. Worn or improper size cable liner. | 7. Replace cable liner. |
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| 8. Partially | flashed, | melted or | 8. Replace the contact tip. |
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| improper size contact tip. |
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Variable or “hunting” arc. | 1. Contact tip worn or incorrect size. | 1. Replace contact tip. |
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| 2. Worn or undersize work cables or | 2. Inspect – repair or replace as nec- | |||
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| poor ground connections. | essary. |
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| 3. Loose electrode connections. | 3. Be sure the following connections | |||
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| are tight: electrode cable to wire | |
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| feeder and power source, work | |
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| cable to power source and work, | |
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| gun cable to wire feeder contact | |
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| block, gun nozzle to body and | |
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| contact tip to nozzle. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
MAGNUM® PRO 250, 350, 450 & 550 AMP