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MANAGERS AND PROJECTIONISTS 555
corresponding lettering on both bearings must go either to the inside or outside of the housings.
BEARINGS LEAK OIL— CAUSES.— When sleeve type bearing leak oil it may be caused by (a) Oil ring has slipped from under retaining pin. (b) Overflow hole of well stopped up. (c) Oil wells filled too full, (d) Overflow cover stuck down, (e) Drain hole on inside end of bearing clogged up. (f) A sand hole in the bearing housing, (g) Bearing badly worn.
Ball Type: (a) Grease too thin, (b) Excessive greasing, so that grease is thrown out by centrifugal force, (c) Bearing housing or bearing excessively hot. Clean thoroughly with kerosene, flush with oil and apply fresh grease.
MOTOR DOES NOT RUN AT FULL SPEED.— (a) Low supply line voltage or wrong cycles. Causes motor to run slow and overheat, (b) Fuse of one phase blown, (c) Wrong connections to motor. 220 volt motor connected on 110 will run slow and may overheat. 110 volt motor connected on 220 will either blow fuses or overheat, (d) Motor rotor and generator armature rotating in wrong direction.
Line voltage must be as specified on name plate ; also cycles if it be an A. C. motor.
If motor operates alright for several hours and then gradually looses speed, and you can find none of the trouble hereinbefore described present, then the cause most likely lies in the motor rotor or stator. Repairing is the only remedy.
LOW GENERATOR VOLTAGE may be caused by (a) Insufficient speed, (b) Fault in commutator, (c) Poor or dirty brushes, or lack of sufficient brush tension, (d) Wrong make or type of brush, (e) Loose pigtails, (f) Loose or corroded joints in wiring or on generator.
ALL WIRE splices must be so soldered that the wires are perfectly electrically bonded. All wires must have sufficient capacity, see Table 1, page 70. All switches must have sufficient capacity to avoid excessive resistance. If in doubt play safe and install a too-large conductor, rather than one to small.
MACHINE OPERATES NOISY.— (a) Worn bearings, (b) Bearings improperly installed or defective, (c) Machine not set level, (d) Air gap not equal all the way around motor rotor, (e) Bearings loose in housing or on shaft, (f) Shaft sprung or armature out of balance.