That is the whole bearing. The collar sits on top of the plate. Use some
grease between the collar and plate.
Skip, KJ6Y
818-522-5421
Communications Service Co
Sent from my IPad
On May 15, 2021, at 7:56 AM, Ken Alker <ka6ken@alker.net> wrote:
Hi,
I recently acquired a Hy-Gain HG70HD tower. I hired a crane operator to lift
the mast/antenna assembly off the tower and then had the tower lifted out of
the back yard and placed horizontally on a boat trailer to haul it away.
When I got home, I removed a "collar" from the mast that appears to be what
might sit on top of a thrust bearing (or, perhaps, *is* the "top" of the thrust
bearing assembly). Here is a picture:
http://www.alker.net/albums/ham-tower-thrust-bearing/IMG_6986.sized.jpg
This collar rested in a "female" circular mating piece that is bolted to a
plate on the very top of the tower. See following pictures:
http://www.alker.net/albums/ham-tower-thrust-bearing/IMG_6984.sized.jpg
http://www.alker.net/albums/ham-tower-thrust-bearing/IMG_6985.sized.jpg
I am assuming there was some kind of bearing "pack" sitting in between the
collar and the mating surface on the top of the tower that was stuck to the
bottom of the collar and fell off when the mast was lifted off the tower, or it
stuck to the mating surface on the top of the tower and fell off when we tilted
the tower over (or when I drove off).
That said, I'm not totally convinced there was ANY type of bearing between
these two items. Maybe they are meant to be lubricated and swivel against each
other? I don't think so, but I have no idea, as the manual I found doesn't
show any pictures of the optional thrust bearing assembly. There is enough
space between where the collar sits on the top of the tower, and the inner
"shelf" mating surface for some type of bearing assembly (I'm thinking of the
circular exposed, but captured, ball bearings that I found in my Schwinn
bicycle hub when I disassembled it as a child in the 1970's).
Can someone please enlighten me? I'd really like to see some pictures! I
can't find anything via Google.
If there is a bearing that gets sandwiched between these pieces, does anyone
know where I can get one?
Thanks!
Ken, KA6KEN
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