[major]

Hi pple

My friand has a gulfcart in wich the motor's commutator become pitted.
A new motor was installed and the new motor's commutator also became pitted.
Could any one advise on possible cause.

Thank U.

Hi nog,

More info and some photos would be nice. What brand motor is it? Controller? Size of cart and how it is used?

Commutator pitting results from excessive arcing. This can be caused by a whole bunch of reasons. Like:

Improper spring tension.
Improper seating (no break-in period).
Poor design/quality with brush grade or comm machining.
Vibration.
Excessive load.
Contamination.
Low humidity.
Sunspot activity*

Regards,

major

*just kidding on that one