I have an older Hi-Boy oil burner furnace direct drive blower. Lately, the
blower seems to be vibrating, almost like it's loose. My first thought has
been oiling it, but the manual says it's permanently lubricated and oiling
only applies to belt driven blowers. I just had the furnace cleaned and
serviced a month ago and all went well at the time. The blower is very
difficult to reach without tearing apart the furnace housing, but when I
place my hand in there to feel the blower cage, etc, it doesn't feel loose
to me or anything like that. Just when it runs, you can hear the vibration.
Is it possible that the burner does in fact need oiled and, if so, where?
I've never quite bought into the idea of permanently lubricated motors and
the manual does mention placing a "drop of oil on shaft at each end of
bearings". I have no idea where this location would be.

Any assistance would be appreciated.

Thanks in advance,
Jason