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 I 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 Brush Holder Replacement If brush holders are damaged they can be replaced by special service units which are attached with screws and nuts Assembly After all parts have been thoroughly tested and inspected and worn or damaged parts replaced the generator should be reassembled Pack ball bearings with high melting point ball bearing grease before assembly 1 Install felt washer retainer bearing gasket and retaining plate to drive end frame Install felt I washer retainer with inner depression toward felt washer 2 Install inner spacer washer on drive end frame of r armature shaft and place drive end frame over end of armature Slide outer spacer collar over shaft into end frame See Figure 8 15 r 3 Install new brushes in brush holders and push brushes back against spring tension NOTE If brush holders are damaged they can be replaced by special service units which are attached with screws and nuts 4 Install armature and drive end frame assembly to housing Release brushes so they will contact commutator 5 Add 2 drops engine oil to porous bushing and assemble commutator end frame over end of armature shaft Rotate both end frames until dowels engage then install through bolts 6 Assemble key fan and pulley to shaft as follows then install lockwasher and nut see fig 27 a Cradle the generator in a fixture with a backup plate against the rear bearing cap to avoid damage to the cap when installing the pulley b Insert the key into the keyway supporting the lower side of the shaft c Line up the key and keyway in the pulley and mount on the shaft using a steady press on the pulley if interference is encountered d Torque the pulley attaching nut to 50 60 ft lbs r BACK UP PLATE BEARING CAP KEY GENERATOR PULLEY I III I a rw 1 r I v All