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@contesting.com] On Behalf Of
Robert Harmon
Sent: Friday, January 29, 2016 4:13 PM
To: towertalk@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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