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FOR MANAGERS AND OPERATORS
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should be made by an electrician, who should follow the wiring diagram sent with the machine.
General Instruction No. 3. — Oil. The much advertised patent oils are absolutely unfit for motor or generator lubrication. If you use them you are more than likely to either have trouble with the bearings, or a comparatively frequent and unecessary expense for bearing renewal, to say nothing of worn journals.
The character of oil to be used will depend considerably upon climatic conditions. In the South, where it is always comparatively warm and much of the time summer heat, I would recommend the same oil used for generators in the local electric light plant. The superintendent of the plant will tell you what it is, and no doubt will sell you oil at a reasonable figure. You cannot do any better, because oil used to lubricate heavy generator bearings is necessarily an excellent lubricant, and you can rest assured the light plant has the oil best suited to local climate. In the Middle North, I would recommend a medium heavy dynamo oil for summer use; it may be used the year round if the generator is in a room that is kept warm in winter, but if in an unheated place a light dynamo oil will be found to give the best satisfaction in winter. In the extreme North a medium oil in summer and a light dynamo oil in winter will be best.
Caution. — Most, if not all, motor generator sets have the oil carried up to the journals by rings which rest on the journals and revolve merely by the friction of their own weight on the journal, as per Fig. 179, which shows the oil ring resting on the journal, revolving through a groove in the babbit bearing. Now, you will readily see that if too heavy an oil be used in winter time, and the machine be located where it is very cold, the oil will congeal and stop the ring from revolving, in which case no oil would be fed to the journal and there would be trouble. There are grooves cut in the babbit bearing to facilitate oil distribution.
Be sure your oil is free from dust or sediment. Never leave oil standing open. If you do it will collect dust and
Figure 179.