Lubrication PM’s that instruct technicians to grease machines are based on schedules that are often plucked from the mind of the lubricant product supplier. As it turns out, many of these PM’s are set at frequencies that do not match well with machine needs. Check the logic of your regrease intervals:
As the nDm (n = shaft speed, Dm = mean diameter) rises, the interval should be more frequent and as nDm falls, intervals are extended. Replacement volume is determined by bearing type and size and Volume shouldn’t change unless calculated intervals fall below 7 days.
As the bearing speed and contamination load (heat, moisture, water, solids, vibration) rises the length between visits must degrease. As speed drops, or cleanliness improves, the length between visits should be less frequent.
From the desk of Mike Johnson, President