2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 205Get this manual
ELECTRICAL cable terminal and brush housingMake sure the brush is not touching the caseThe reading should be infinite2Remove nut, flat washer, large phenolic washer, two small phenolic washers, and O-Ring from brush terminalInspect the O-Ring and replace if damaged
Brush Length
516 (.8 cm) 3Remove brush terminal end of housing while holding other two sections togetherBrush Length Service Limit: 516 (.8 cm) 3Remove brush plate and brushesMeasure length of brushes and replace if worn past the service limitReplace springs if they are discolored or have inadequate tension4Inspect surface of commutator for wear or discolorationSee Steps 3-6 of armature testing on Page 10.235Install new carbon brush assembly in the brush housingNOTE: Be sure that the terminal bolt insulating washer is properly seated in the housing, and the tab on the brush plate engages the notch in the brush plate housing6Place wrap of electrical tape on the threads of the terminal bolt to prevent O-Ring damage during reinstallation7Install the O-Ring over the boltMake sure the O-ring is fully seated