2009-2010 Polaris RZR Factory Service Manual, Page 348Get this manual
ELECTRICAL Brush Replacement 1Remove terminal nut with lock washer, flat washer, large phenolic washer, the small phenolic spacers, and sealing O-ringInspect O-ring and replace if damaged4Measure the resistance between each commutator segment and the armature shaftThe reading should be infinite (no continuity)Slide positive brush springs to the side, pull brushes out of their guides and remove brush plate
CAUTION
Check commutator bars for discolorationBars discolored in pairs indicate shorted coils, requiring replacement of the starter motorPlace armature in growlerTurn growler on and position hacksaw blade or feeler gauge lengthwise 18" (.3 cm) above armature coil laminatesRotate armature 360 If hacksaw blade is drawn to armature on any pole, the armature is shorted and must be replacedArmature Testing