[TowerTalk] Question about Hub City oil change

[Bob K6UJ]

Hi Rick,
They claim that synthetic oils do provide less friction than petroleum based oils.I can't explain what happened in your case but after I flushed the gearbox and put syntheticgear lube in my HDX589MDPL I noticed the gearbox didn't get as hot as before.  Now only warm 
to the touch.  Also quieter.  Didn't notice any difference in how far it traveled after 
the switch was thrown, but didn't really compare.  I don't know how far it traveled before 
the gear oil change.  I went with one of Hub City's recommendations for the synthetic gear lube 
for my gearbox.  I used Mobil Glygoyle 460.  It is advertised to be formulated specifically for worm gearboxes.  It sounds like your PGO-FGL 460 is equivalent.  

BobK6UJ

      From: Richard (Rick) Karlquist <richard at karlquist.com>
 To: towertalk at contesting.com 
 Sent: Saturday, August 5, 2017 4:30 PM
 Subject: [TowerTalk] Question about Hub City oil change
  
Question: does synthetic gear oil have noticeably lower
friction than petroleum based oil?

Today I changed in gear oil in the Hub City
gear box on my HDX-5106.  I used Motion Industries
PGO-FGL 460 synthetic gear oil.  First I warmed
up the box by raising and lowering the tower a
couple of times.  The HC box was now at about 60
degrees C.  I flushed a couple of times using
a flush that Motion Industries recommended.  Finally,
I put in the initial fill of the synthetic oil.

When I turned on the winch going up, everything appeared to
be "normal", as it was with the old oil.  I stopped
the winch and started it going down, still everything normal.

However, when I turned off the winch going down, the
motor took much longer than before to spin down;
the better part of a minute. The tower continued to
move down an additional 18 inches after the switch
was thrown.  Much farther than before the oil change.
I might have to re-position the lower limit switch.

Has anyone else seen this phenomenon?  Is it conceivable
that the synthetic oil is that much "slipperier" than
the old oil?  Did I use the wrong oil?  Too little
viscosity?  It didn't seem like it was lower viscosity
than the old stuff.

I drained the initial fill of oil and refilled it again,
but nothing changed.

Rick N6RK

On 8/5/2017 9:28 AM, Jim Brown wrote:
> More than 10 years ago, I bought a bunch of this stuff and built wire 
> antennas with it. All broke within a year.  I love Davis RF coax, but 
> this wire is a loser.
> 
> 73, Jim K9YC
> 
> On 8/5/2017 8:39 AM, Mickey Baker wrote:
>> I use the Davis FlexWeave insulated wire
> 
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
> 
> 
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk