Be sure you have an oil level indicator on your pump. Be sure the pump is level. Many pumps have been aligned without checking to see if they were level. The oil level should be half way through the bottom ball when the pump is at rest. Unfortunately you cannot use oil lubrication on a vertical installation.
Some mechanical applications use bearings of different diameters.
This makes it impossible to maintain a correct oil level. Vertical applications have the same problem. Oil mist is the preferred method if you can solve the fugitive emissions problem . Oil mist can provide a positive pressure inside the bearing to keep out contaminants. Mixing the oil with air presents a problem because of venting hydrocarbons to the atmosphere.