After the commutator has been undercut and carefully inspected, the surface should be lightly polished with fine sandpaper or commutator stone. Windings should be thoroughly blown out and all copper dust wiped from the commutator surface and adjacent parts. A close watch on all electrical equipment with periodic servicing will give years of dependable and uninterrupted performance, A little time spent at regular intervals to keep the machines in first-class condition will avoid costly repairs and shutdowns, DIS ASS EMBLY Refer to the assembly drawing of the machine and the parts list. Uncouple the machine and remove the foot bolts holding it to the foundation, and transport the complete unit to some area permitting easy accessibility. Remove the dripproof cover from the frame and raise the brushes away from the commutator. Place a piece of cardboard or heavy canvas between the brushholders and the commitator to prevent the holders from scratching the bars when the armature is removed. Disconnect the arma- ture leads from the brush studs, Take off the bearing cap and the bracket on the commutator end of the machine, and remove the ball bearing lock nut and lcck washer, and press off the ball bearing with the bearing spacer as described in the section on "idaintenance", Note the marked position of the brush yoke on the bracket for reference in assembly before removing the brush yoke. Take off the bearing cap and the bracket on the drive end of the machine, and remove the ball bearing lock nut.and lock washer, and press off the ball bearing with the bearing spacer as described in the section "Maintenance", 3-58