Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

It is probably an oil impregnated bronze sleeve bearing, also known as an Oilite bearing.  It is made from a porous SAE 841 alloy which carries between 17-20% SAE 30 oil within it's pores.  The oil acts as a cushion between the bearing and the shaft, adding resistance to shock loads (suddenly applied loads) and wear.  They are virtually maintenance free.  If you feel compelled to lube it I suppose a little additional SAE 30 oil applied into the seam where the bearing flange is showing couldn't hurt.