In each motor bearing and around the motor shaft is a brass ring, the inside diameter of which is considerably larger than the diameter of the motor shaft. This ring rides on the shaft when the motor is running. The lower edge of the ring is dipped in an oil well. Oil adheres to this oil-ring and is carried to the top of the shaft where it is rubbed off by the rotating shaft, thus keeping it oiled while the set is running. The level of the oil in the oil cups on the motor should be inspected once a week and, when necessary, oil should be added to keep them half full.

The generator bearings are similar in operation but different in appearance. A hinged cover permits a view of the oil ring in the bearing, and the oil level is checked by observing the height of the oil in the little oil vent under the hinged cover. Check the oil level in these bearings once a week and, when necessary, add oil to hold the level about one-eighth of an inch below the edge of the vent.

If, at any time, the motor fails to start when the push-button is operated, operate the reset device of the motor line contactor to make sure that the thermal relay switch is not open.

If neither of the motor line switches close when their respective starting buttons are pressed, look for blown fuses in the main supply line.

If the motor runs, but there is no reading on the generator control panel voltmeter, check the 30 ampere fuses which are mounted just below the generator line switch which is closed.

If trouble develops on one M-G set and it is necessary to use the other, call this fact to the attention of the service man as soon as possible. Do not wait until both units are defective before reporting it.

19