Lincoln Electric SVM204-A service manual Cable TIE Brushes, Cleaning Slip Rings

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F-21 TROUBLESHOOTING AND REPAIR F-21

BRUSH AND SLIP RING SERVICE PROCEDURE (continued)

FIGURE F.6 – BRUSH REMOVAL AND REPLACEMENT

CABLE TIE

BRUSHES

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9.Check for evidence of sticking brushes. Sticking brushes will normally result in the slip rings being pitted and discolored from exces- sive arcing. Another sign of sticking brushes is instability or loss of both weld and auxiliary out- put, but the machine may also begin to work properly for a short time after being jarred or moved.

10.If there is any evidence that the brushes may have been sticking in the brush holders, a new brush holder and brush assembly should be installed.

Cleaning Slip Rings

1.In the event that the slip rings have become dirty, discolored or mildly pitted, it will become necessary to clean them using very fine 500 or 600 grit emery cloth or a 220 or 320 grit com- mutator stone.

2.Use low-pressure compressed air to thoroughly blow the carbon, commutator stone and sand- paper dust from the machine before operating.

3.To install the brush holder assembly, push the brushes into the brush holder assembly and place a plastic cable tie through the holes pro- vided. See Figure F.6.

4.Slide the brush holder assembly back into the generator and secure with the two screws removed earlier. Reattach the leads and remove the cable tie. Replace the plastic gen- erator cover.

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