Commutator End Frame & Bearing
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Replace armature assembly if commutator outer diameter is less than 1.378" (36 mm) or if undercut depth is less than .008" (.2 mm). DO NOT undercut insulation. Ensure commutator end bearing has not spun in frame. If bearing has spun, replace frame and bearing. DO NOT lubricate bearing. If bearing is dry or damaged, replace bearing. Measure original bearing depth and install new bearing to same depth.