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FOR MANAGERS AND OPERATORS 391
Care of Machine. — Cleanliness. See General Instruction No. 5.
Oil. — See General Instruction No. 3; also, in addition, immediately after starting a new outfit raise the bearing caps and see that the oil rings are revolving freely and carrying oil up to the top of the shaft. Keep the oil to the proper level in the well, which is nearly to the lip of the overflow oil gauge. The oil wells should be cleaned out occasionally and new oil supplied. They should invariably be filled through the side filling hole and not through the top of the bearing. If filled through the top the oil is likely to run out through the ends of bearings, get into the windings and do damage.
Bearings. — As soon as the bearing linings become worn so that the armature is in danger of rubbing against the stator, a new set of bearing linings must be inserted. To remove the bearings first take out the set screws in the bearing-housing. Having done this lift the oil rings up so that they clear the bearing lining; to lift rings use a wire with a hook bent on one end and raise rings with wire through the bearing cover and drive out the bearing linings with a wooden block of the same diameter as the bearings themselves. The bearings are so made that they fit the hole in the housing snugly enough to require light driving to seat them, and they must be handled carefully and intelligently. When duplicate bearings are supplied for the alternating current motor the set screw depression is already in the bearing, but the D. C. motor generator bearings, which regulate the end play, are supplied without the spot for the end of the set screw and they must be spotted before being put into place. Use a three-sixteenth inch drill and drill a spot for the tip of the set screw the same distance from the end of the bearing as the one being replaced.
Care of Commutator and Brushes. — See "General Instruction," No. 4, and in addition, to secure proper commutation and proper operation the brushes must occupy the correct position on the commutator. The proper position of the brush has been determined at the factory, and is indicated by chisel marks, filled with white lead, on the brush yoke and frame.
// is very important that these marks be in line with each other.
Should the brush holders become loosened or moved in any