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MANAGERS AND PROJECTIONISTS 537
rection the armature runs. NEW BRUSHES SHOULD BE OF THE SAME GRADE AS THOSE RECEIVED WITH THE SET. They should have no more clearance in the holder than will permit of their sliding freely in and out.
TYPE AR SINGLE-PHASE MOTOR— When brushes must be renewed, they may be removed as follows : Turn the rocker ring so that the brushes come between the arms of the bracket and remove the screws of the clips which hold the brushes in place. Pull out old brushes and insert new ones, replace the clip screws and turn the rocker ring until pointer is opposite line giving proper direction of rotation.
THE FRONT BRACKET OF MOTOR SHOULD NOT BE REMOVED UNLESS ABSOLUTELY NECESSARY. If it
is removed, when replacing be certain that the steel pin in the brush-raising ring enters the corresponding hole in the brush holder casting. Failure to do this will probably result in poor operation of the machine.
REPAIR PARTS— Repair parts for Westinghouse Motor Generators should be obtained ONLY from the Westinghouse Company. When ordering parts be sure to give name of part wanted, AND SERIAL NUMBER OF THE SET UPON WHICH IT IS TO BE USED. Serial number is stamped both on end of armature shaft and on name plate of the machine. Failure to send this number with your order will result in delay in receiving the part.
New bearings may be obtained from the district office of the company which is nearest to you. Spare bearings should always be kept on hand.
If bearings over-heat the probable cause is (A) Poor lubrication, which may be due to (1) poor quality of oil, or (2) failure of oil rings to revolve. (B) Improper alignment of bearings. (C) Set not level, causing excessive armature end thrust or binding. (D) Rough bearing surface. (E) Bent armature shaft. (F) Grit or dust in the oil.
WHEN A BEARING HEATS excessively, flood it with heavy oil. If this does not cool it down, shut down the set, but keep the armature revolving slowly until the bearing is cooled down. This latter is IMPORTANT, since if it is not done the bearing and shaft may "freeze" together when cold, which would make a very bad condition indeed.
POINTERS ON OPERATION— It may sometimes happen that when a motor-generator set is started, its generator will