(121) Oil Cup Failure.
Oil cups should be cleaned out frequently with gasoline or kerosene, as any gum or lint will interfere seriously with the feed. They should be adjusted and filled frequently to prevent any possible chance of a hot bearing.
Oil cups should be as large as possible in order that they may be left for considerable periods without danger of a hot box.
Cold weather affects the oil feed to a considerable extent, especially with small oil cups, and they should be kept as warm as possible. When heavy oils are used a cold draft will stop the feed.
Oils may be made more fluid in cold weather by the addition of about ten per cent of kerosene.