[TowerTalk] FW: US Tower seized gearbox

[Robert Harmon]

Right from the horses mouth.  I did the conversion just three months ago
so it is recent input from Hub City.  I am not a mechanical engineer so 
I cant
relate to the ISO and viscosity specifications you mentioned.   I just 
relied on
Hub Citys recommendation.  My gearbox likes the synthetic lube better.
It now gets just barely warm from a couple up and down cycles. Before it 
was hot
afterwards.   Hub City has a reason for recommending
the synthetic lube..................
Even if you elect not to go with the synthetic the important thing is to 
change
the lube regularly.

73,
Bob
K6UJ


On 1/29/16 8:12 PM, Matt wrote:
> Hi Bob,
>
> I thought the Hub City worm gear lubricant specification is ISO460, at least
> that is what I found on their WEB site a few years ago when rebuilding my
> gear box (pics at website if interested)
> http://192.185.4.60/~flukey/km5vi/New%20Station/Tower%20Prep/Tower%20Prep.ph
> p
>    
> Link to the Hub City Lubricant Recommendation that I found is:
>
> http://www.hubcityinc.com/documents/6r-LubricationandInstallationInstruction
> s.pdf
>
> SHC630 is ISO 220, which is similar viscosity to SAE 90w as you point out.
> Equivalent SAE viscosity for ISO460 is SAE 140w.  Probably no big deal
> between the two for a flooded gear box but I'm just curious where you got
> the recommendation ?
>
> Thanks for posting,
> Matt
> KM5VI
>
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
> Robert Harmon
> Sent: Friday, January 29, 2016 4:13 PM
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] US Tower seized gearbox
>
> The original lube in the Hub City gearbox is 90W petroleum based gear oil.
> They recommend using Mobil Synthetic Gear Oil SHC630 when changing the lube.
> It is also 90 W.  The gearbox should be drained and flushed with a
> recommended flush oil before putting in the new synthetic oil.  (Hub City's
> instructions are below) When I did this conversion the new synthetic lube
> had a dark brown color, I called Hub City and asked them about it and they
> said I needed to suck out the remaining flush oil in the bottom of the
> gearbox before putting in the new lube.  The drain plug on the bottom
> doesn't drain it all out there is still about 1/2" of lube in the bottom.  I
> drained it again and stole my wifes turkey baster with the squeeze bulb and
> sucked out the remaining lube.  I put a short stub of plastic tubing on the
> end so it would reach inside.  It worked great.
> (I bought her a new turkey baster hihi)  After refilling again with the new
> synthetic lube and ran the gearbox for a little bit the color was almost
> clear, just a slight amber tint.  Hub City says our usage is different than
> the typical usage for these worm drive red gears.  They said most of the
> ones are used in continuous duty for conveyer belt drives etc.
> Our non continuous
> use should give us a long service life.   We still need to change the
> lube periodically.  I am going to change mine every three years.   I
> neglected the gearbox for a long time,  was focused on greasing all the
> fittings on the tower.
> 73,
> Bob
> K6UJ
>
> Here is Hub City's flushing procedure
>
> http://www.winsmith.com/documents/Mobil_Glygoyle_General_Flushing_Procedure.
> pdf
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