In a message dated 97-01-12 11:13:16 EST, you write:
>Since this is an open design for a bearing and it's
>turning slow, one would think it shouldn't need any
>lube. Right or wrong?
>
The LXC Prime Directive for tower and antenna projects is to "do what
the manufacturer says". The corollary to that is "don't do what they don't
tell you". In other words, Rohn didn't say to lubricate the TB-3 so you
shouldn't. Since it only turns one RPM, there's not much that is going to
happen to it during normal use.
Lubricating it will actually cause premature failure because the grease
will hold onto any contaminants that are blown through in the wind (dust,
rain, etc.). The same is true for crankup cables: do not use a grease on
them. There are special lightweight cable lubricants that you should use
that will soak into the cables without attracting contaminants. In the case
of Rohn thrust bearings, leave 'um alone. And like Rod, N4SI, says, if in
doubt - throw it away and get a new one.
73, Steve K7LXC
TOWER TECH -- professional tower supplies and services for amateurs
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