On Tue, 2007-11-27 at 22:24 -0500, w8au@sssnet.com wrote:
> At 09:53 PM 11/27/2007, Phil Zminda wrote:
> >A rebuild will fix it, but it will come back. I wasn't a real
> >active operator while I had the Corsair, so it may be less likely if you are
> >on more frequently and keep the PTO exercised. After two or three rebuilds
> >over the 17 or so years I owned the Corsair II, I finally went digital with
> >a Jupiter.
>
> Although the real cure has been mentioned numerous times over the
> last 15 years or so,
> this question periodically comes up. The need is mostly to "re-lube"
> not rebuild,
> because the original grease has hardened and caused the vernier to slip.
> Needless labor is done when not necessary.
>
> 1. Set TT PTO rig (all models) on it's back with front panel up.
> 2. Using small allen wrench remove main tuning knob.
> 3. Remove felts to expose the shaft entry point into PTO.
> 4. Drip denatured alcohol into this entry point and turn outer and inner
> shafts until they free up. Turn from end to end of range many times.
> 5. After a few minutes apply Tri-Flow bicycle lubricant (Teflon based)
> to same area and turn shafts in same fashion.
> 6. Replace felts and tuning knob.
> 7. Don't expect shaft to freeze up ever again. (unless you store the rig
> in your attic for 20 years) :-)
>
> I have done this to no less than eight TT PTO sets over the years and the
> problem has never recurred.
>
> Tri-Flow is available at most bicycle shops.
>
> Perry w8au
>
That would not have fixed the PTO in my Corsair II. It was slipping,
more at the low end of the band because the balls had worn a deep groove
in the outer race of the vernier. That required new parts.
And that's the other failure, failing to tune when the spring tension is
highest. Lubrication won't cure that wear.
73, Jerry, K0CQ
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