Return to Section TOC
Return to Section TOC
Return to Master TOC
Return to Master TOC
TROUBLESHOOTING AND REPAIR |
BRUSH AND SLIP RING SERVICE PROCEDURE (Exciter / Auxiliary Power Alternator) (continued)
FIGURE F.4 – BRUSH LOCATIONS
BRUSHES
Return to Section TOC
Return to Section TOC
Return to Master TOC
Return to Master TOC
PROCEDURE (continued
5.Check for evidence of sticking brushes. Sticking brushes will normally result in the slip rings being pitted and discolored from excessive arcing. Another sign of sticking brushes is instability or loss of both weld and auxiliary output, but the machine may begin to work properly, for a short time, after being jarred or moved.
6.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:
In the event that the slip rings have become dirty, dis- colored or mildly pitted, it will be necessary to clean them, using very fine (500 or 600 grit) emery cloth, or a 220 or 320 grit commutator stone.
CAUTION: Commutator stones should only be used by experienced technicians who have the knowledge and equipment necessary to use them safely.
Seating brushes:
If brushes have been replaced, repositioned, or are not making full contact with the slip rings, it will be neces- sary to
Use low pressure compressed air to thoroughly blow the carbon, commutator stone, and sandpaper dust from the machine before operating.
Securely connect the leads to the brush terminals (see wiring Diagram) and replace the alternator cover if test- ing and service is complete.
