1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 151Get this manual
dIf necessary to remove pmIOn gear, use strap wrench to hold armatureSee Figure 7-16Remove locknut, spacer, anti-drift spring, pinion gear and drive end cap from armatureDiscard locknut as it loses its locking feature once removed CLEANING, INSPECTION AND REPAIR
aInspect the brushes; replace if one-half worn, damaged, or crackedReplace brush springs if weakbClean commutator with grade 00 sandpaperIf commutator surface is unevenly worn or pitted, turn on latheRemove any trace of oil from commutator
cCheck the armature on growler for shorted turnsSee Figures 7-17 or 7-18Check armature for grounding by using test light or meterSee Figures 7-19 or 7-20Inspect 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