The bearing for the tower pulleys is the Fafnir or Torrington K8 or KP8,
but not the KP8A! The KP8A is smaller.
Look on eBay about a month ago, there were 10 available, I bought two.
Think they were abt $25 each.
I have been pressing out the old, bad bearings and pressing in new ones for
years. Don't forget to use a small pointed punch and make new pinches to
keep the bearing more securely in place.
Ray
N6VR
Near Prescott, AZ
On Mon, May 27, 2019, 2:01 AM Grant Saviers <grants2@pacbell.net> wrote:
> I checked Fafnir cross reference and am not sure the ebay K8 is the
> correct bearing. The cross reference makes it a 208K8, a much larger
> bearing and the price correlates. Better check with the seller about
> the exact dimensions.
>
> On one crank up where I replaced the lift cable bearing, used an
> aircraft control cable ball bearing (found on ebay) which has a wide
> inner race so the sides of the sheave (and the control wire) can't
> contact the support flanges. Or with a couple of correct
> id/od/thickness washers on a regular deep groove ball bearing that fits
> the existing sheave. Ideally, the bearing outer race should be swaged
> into the sheave, but some high strength loktite bearing retainer will
> also work.
>
> Grant KZ1W
>
> On 5/26/2019 14:07 PM, charlie@thegallos.com wrote:
> > Is it a needle or a ball bearing?
> >
> >
> https://www.amazon.com/K8-12-10-Consolidated-New-Needle-Bearing/dp/B01JVGV7AU
> >
> >
> > https://www.hendersonbearings.co.uk/k8-ball-bearing-brand-skf.html
> >
> > If you have a local bearing supply house, you can take it there, they
> > will tell you what you need
> >
> > Interestingly, we are back to one of the BIG issues from the early days
> > of ball bearing - failures of bearing that rarely move, out in the
> > weather, under heavy load
> >
> > Bronze bearing remained in common use in that situation for a LONG time,
> > but need an oil reservoir.
> >
> > My pet thing - again, is this is where the PROPER use of plastic bearing
> > materials would probably be the best thing.
> >
> >
> >
> > On 2019-05-25 20:27, Kim wrote:
> >> Scotty,
> >>
> >> Contact Ray at isheaves.com
> >>
> >> He's working with several hams to line up a run of pulleys to meet our
> >> needs.
> >>
> >> 73, Kim - WG8S
> >>
> >>
> >>> On May 25, 2019 at 2:49 PM Scotty <scotty@ashiko.com> wrote:
> >>>
> >>>
> >>> I have a US tower TX-455 that tilts over.
> >>>
> >>> The bearing in the top of the raising fixture's sheave needs replacing.
> >>>
> >>> The matching sheave on the tower has the same bearing and is still in
> >>> good shape.
> >>>
> >>> I can press out the old bearing and press in a new bearing.
> >>>
> >>> Can someone please tell me the brand name and model number of the
> >>>
> >>> bearing that they have used for this replacement?
> >>>
> >>> Bearing bore size is about 12 mm.?? OD is about 42 mm. Width is about
> >>> 13 mm.
> >>>
> >>> The worn out bearing says: NICE PHILA K8
> >>>
> >>> Sincerely appreciate any help.
> >>>
> >>> Scotty W7SW
> > _______________________________________________
> >
> >
> >
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> >
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