On 5/17/2010 8:47 PM, Kathy Bookmiller wrote:
> Hi TTers,
> I got that Rohn 45 tilt-over down and home last week. In remarkably good
> condition. Only thing I wondering about is the TB3 thrust bearing and how to
> lubricate it. It turns freely but has a notable rumbling sound and feel to it.
The TB-3 is far from a precision bearing or the feel of a precision
bearing. IOW It's rough!
IIRC they used to say not to grease them, but rather run them dry. You
have steel ball bearings running in a cast aluminum race which is not
the best combination in the world.
I've literally destroyed two TB-3 bearings. I'm moving to all sleeve
type thrust bearings with collars above them that can be tightened in
place to support the load when the rotator is removed.
73
Roger (K8RI)
> I notice at the bottom of the inside shaft area where to mast passes
> through, is a recessed Allan head fitting/plug. Would this be the place to
> remove and squirt in some white grease? And then replace the plug?
> Thanks for your guidance,
> Kathy
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