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Re: [TowerTalk] TowerTalk Digest, Vol 94, Issue 56

Subject: Re: [TowerTalk] TowerTalk Digest, Vol 94, Issue 56
From: "Roger (K8RI)" <>
Date: Wed, 27 Oct 2010 19:01:28 -0400
List-post: <">>

On 10/27/2010 6:22 PM, Michael W5NIG wrote:
>    Roger I am not sure which one I have but here is a picture of it that I
> have uploaded to my server.  It has
> obviously been painted and is the older style with the motor coming down
> from top instead of in the side.
> I'm having a hard time picturing what you are describing though (never very
> good at painting pictures in my head).
> are you talking about water getting under the circular plate the shaft is
> mounted through?   Where did you find a rubber flange (or
> what did you make one out of) to solve the problem?
go to photo 30 (near the bottom of the page)  It's a large page with lots of 
photos of rebuilding a PST-61.
In the photo I'm in the process of making a cover for the seal recess. 
Yours has a metal cover over that area, which is good, but not a cure 
all for wind driven rain.  By the looks of it I'd say it's older than 
mine, but AFAIK the cover didn't come out until later so it may be 
newer. OTOH it is not the new version that has been on the market for 
several years.  The old ones use an AC motor while the new ones use a DC 

BTW the large worm gear wheel in these is bronze pressed or cast onto a 
steel hub. I ordered one and never did get it.  I'm not sure what the 
new ones use.  The closeness of the manufacturer of the Alpha Spid, 
lower cost, and more readily available parts is my reason for choosing 
the Alpha Spid over the ProSisTel rotators which I do like.


Roger (K8RI)
>     Thanks,
>         Michael de W5NIG
>> Message: 2
>> Date: Wed, 27 Oct 2010 10:08:29 -0400
>> From: "Roger (K8RI)"<>
>> Word of caution if it is one of the older "green" PST-61s.  The top seal
>> is a weak point with a reinforcement ridge around it that traps water.
>> The high carbon steel shaft rusts, then grinds up the seal, water gets
>> in and trashes the bearings.  A simple rubber flange with a slight cone
>> shape that extends well beyond the ridge, plus packing the recessed area
>> above the top seal with white lithium grease seems to take care of that.
>> 73
>> Roger (K8RI)
>>>      Michael de W5NIG
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