I believe that machine bearings are sleeved Babbit bearings, Uses a COPPER chain to circulate the oil. Has to be copper to be anti-magnetic. There are 2 types of copper chains, One looks like a bicycle chain which kinks up and causes the bearing to freeze up due to lack of lubrication. The correct chain is called Universal Chain and is made of copper loops and will not kink and bind to insure oil circulation. Use Otis #2 Bearing oil for lubrication. If your not an Elevator Company I highly suggest you have them replace it or you will be doing it several times due to lack of knowledge. A lot more to it then any Building Maint Man will ever know, Make sure whoever you contract to do the job has Babbit Bearing knowledge.