[TowerTalk] US Tower HDX-689 Sheave replacement

[Mike Ryan]

McMaster Carr sells pulleys. They have an assortment but from what I have 
seen (including the ones I bought for my HyGain HG-70D) these are not 
stainless steel but have some sort of plating, cadium plating or something. 
I will assume they might be good for 6 mos to a year before they begin to 
rust so bad they will ruin the cables that I just put on. This tower came 
with aluminum pulleys. Not a bad idea since they wont rust, but they are 
soft and deteriorate quickly. They use a bronze bushing that is easily 
replaced..also easily trashed.  As soon as the bronze busing goes, the 
pulley begins to elongate and that's when things get real interesting.  I 
plan to get something from one of the major tower companies and pay whatever 
is required to get the right stuff.  Anything else is just looking for 
trouble.  So it's pay them now or pay them later.  =Mike

-----Original Message----- 
From: w6rgs at cox.net
Sent: Monday, March 11, 2013 10:58 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] US Tower HDX-689 Sheave replacement

Check out www.hubcityinc.com.
They make the bearings for one of the tower manufacturers.  Lots of
choices, but make sure the measurements are correct.

73  Bill W6RGS

At 06:20 PM 3/11/2013, Bob K6UJ wrote:
>That is discouraging to hear. I am hoping to order some spare bearings for 
>my HDX589.
>I suppose contacting US Tower wouldn't do any good, they probably wont let 
>us know the supplier for the sheave bearings.............
>On the other hand I think I will all them tomorrow and see.
>
>
>Bob
>K6UJ
>
>
>
>
>On Mar 11, 2013, at 4:06 PM, Dan Hearn wrote:
>
> > I have replaced the bearings on myTX472. Two bearing places in Spokane 
> > said
> > that there is no replacement available with the correct ID and OD.. They
> > could supply a bearing with the correct OD but the ID would be too 
> > large.
> > They did have a bronze sleeve bearing with exactly the correct OD and ID 
> > to
> > fill the space between the thru bolt and the available bearing. It was
> > relatively easy to change the bearings and stake the edge of the sheave.
> >
> > Dan, N5AR
> >
> >
> > On Mon, Mar 11, 2013 at 2:59 PM, <gdaught6 at stanford.edu> wrote:
> >
> >>> If you heat a bearing to the flash point of the grease, you've
> >>> probably
> >>> already destroyed the bearing.
> >>
> >> There's no way I can turn the handle on my crank-up fast enough to even
> >> warm the
> >> grease!
> >>
> >> 73,
> >>
> >> George T Daughters, K6GT
> >> CU in the California QSO Party (CQP)
> >> October 5-6, 2013
> >>
> >>
> >> _______________________________________________
> >>
> >>
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> >
> >
> >
> > --
> > Dan Hearn
> > N5AR
> > _______________________________________________
> >
> >
> >
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