Lincoln Electric SVM204-A service manual Brush and Slip Ring Service Procedure

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F-20 TROUBLESHOOTING AND REPAIR F-20

BRUSH AND SLIP RING SERVICE PROCEDURE (continued)

FIGURE F.5 – BRUSH HOLDER ASSEMBLY LOCATION

BRUSH HOLDER ASSEMBLY

SCREWS (2)

LOCKING TABS

COVER

GENERATOR END BRACKET

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PROCEDURE

1.Remove the brush cover from the end of the generator.

2.Pry outward at the top of the plastic brush cover while depressing the two locking tabs at the sides of the cover. See Figure F.5.

3.Remove the brush and brush holder assembly.

4.Use needle-nose pliers to remove the leads from the brush terminals, and then use the 1/4” nut driver to remove the two screws holding the brush holder in place. The brush holder assem- bly can now be pulled straight out from the end of the generator toward the front of the machine.

5.Examine brushes and slip rings. The slip rings, brush holder, and brushes should be clean and free from oil or grease. The brushes should be making good, continuous contact with the slip rings.

6.The brushes should be of sufficient length and have adequate spring tension. Generally, the brushes should be replaced if either brush has less than 1/4” remaining before it reaches the end of its travel. Spring tension should be suf- ficient to hold the brushes firmly against the slip rings.

7.The brushes should be removed from the brush holder and be examined. The terminals should be clean. The shunt, (braided lead connecting the carbon brush to the terminal) should be in good condition and firmly connected to the car- bon brush and to the connection terminal.

8.If the slip rings are discolored, display evidence of excessive sparking, or the brushes have worn prematurely; these may be signs of a grounded or shorted roter. Perform The Rotor Resistance Test.

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