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
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