1990 Johnson Evinrude "ES" Electric Trollers Service Manual, P/N 507869, Page 93Get this manual
Cleaning and Inspection 1Inspect the brushes, and replace if one-half worn, damaged, or crackedReplace brush springs, if weak2Clean commutator with 300 grade emery cloth If commutator surface is unevenly worn or pitted, turn on latheRemove any trace of oil or metal dust from commutatorr-;l1ol 3Check the armature on growler for shorted turns Check armature for grounding by using test light or meterInspect armature insulation for indications of overheating or damaged windingsClean off any deposits of carbon or foreign matter which may contribute to later failure of the windings l2.J L!!J