r 1 1610 i i i v ylis i r resold red provided soldering N Acid flux must never be used on electrical connections When inspection shows commutator roughness it should be cleaned as follows Turning the commutator 1 Turn thoroughly cleaned CAUTION D beyond previously usly turned 2 Undercut insulation between commutator bars 1 32 This undercut must be the full width of insulation and flat at the bottom a triangular groove will not be satisfactory After undercutting the slots should be cleaned out carefully to remove any dirt and copper dust 3 Sand the commutator lightly with No 00 sandpaper to remove any slight burrs left from undercutting 4 Recheck armature on growler for short circuits If brush holders are damaged they can be replaced by special service units which are attached with screws and ASSEMBLY parts been thoroughly tested Brush Holder Replacement After all inspected and worn or damaged parts replaced the starter should be reassembled 1 Assemble brush rigging to field frame a Assemble brushes to brush holders b Assemble insulated and grounded brush holder together with the IV spring and position as unit on the support pin Push holders and spring to bottom of support and rotate spring to engage i NAP RING GROOVE r o Fig 9s Forcing Snap Ring over Shaft