My observation and comment on the symptom of a tower not raising when power
applied, but after a slight down run it will lift.
I have had two TriEX LM470's, and now a US Tower HD589 and they have all
exhibited this phenomenon but it was not motor stall, but the belt is
slipping.
The reversing (down) would usually cure this in one try. The belt being out
in the weather does dry out and can become slippery. A little belt dressing
will fix it for several months. In most cases it is not necessary to
reposition the motor to increase belt tension.
Norm W4QN
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I have had the same problem you are having with the stall upon raising the
tower and have resorted to doing the same thing you do. If I briefly lower the
tower and then switch to raising, it usually takes off and raises the tower.
Once it is under way, it doesn't hesitate or stall the rest of the way up.
There is friction between the various sections and they told me to use bees
wax on the tower areas where there is abnormal friction. I bought some and put
it on and it did help the situation.
I guess it is kind of a tradeoff situation. You can't have an overkill on
power to move the sections as that might put unreasonable stress on the cables
and result in a breakage. Before I put the bees wax on the tower innter
surfaces, it used to bind slightly towards the end of travel up. It is better
with
the bees wax.
Regarding oil, I changed mine last year and I am pretty sure I used regular
automobile differential oil (90 wt?). The Hub City (gearbox mfr) literature
I have says GL-90 for temps between 15 and 60 DEGF, or GL-150 for temps
between 50 to 125 DEGF. It says to change it after every 100 hours of use. For
me,
that is about every 20 years. I chose GL90 because of the lower viscosity.
I talk with Gary Smith at UST when I have questions (559)733-2438. He has
been there a long time and seems to be the most knowledgeable.
By the way, you don't have to buy their replacement v-belt as a Dayco 4L350
from Schucks Auto (or equiv) works just fine at about 1/5th of their price.
These should be replaced periodically as you never want to have one of these
come off or break. All of my expoeriences and information relate to my HDX
572 MDPL which should be equivalent to yours in these areas
John Owens - N7TK
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