[TowerTalk] Slow/Stuck rotator in one direction

Grant Saviers grants2 at pacbell.net
Sat Apr 14 19:55:56 EDT 2018

Does the control indicator show that you are in "overlap" when it 
shouldn't be?

= maybe the mast slipped and the coax is restricting motion
= maybe the Yaesu controller indicator Rube Goldberg o-ring drive is 
kaput to use appropriate terms to describe Yaesu controllers.
= maybe the  "thrust" bearing has failed.
= maybe the bearings in the rotator have failed, or the gears are 
rusted, or the grease has dried out, or it has slipped position and is 
contacting a tower leg, or ...
= maybe it is vertical alignment, but that is down on my list of 

I'd start with a control checkout.  A 500 ohm pot on the position sense 
leads should run the indicator end to end smoothly plus overlap.  Then 
it is time to climb the tower.

Grant KZ1W

On 4/14/2018 10:32 AM, Dana Roode K6NR wrote:
> [Not sure if this got sent the first time, apologies if duplicate]
> Hi,
> My 4 Element 20m yagi is on a 15' mast on a Yaesu rotator in a TX-455
> US-Tower.  Over the last year, it has become slow to turn across the
> NorthWest direction, working fine in other directions.  As of a day or so
> ago, I could turn the rotator counter clockwise into the NW area but now I
> can no longer turn it clockwise to get beyond about 290 degrees.
> My tower et al is at my remote station about 80 miles away and I will need
> to go up there to take a look at what is going on.  I am looking for some
> general advice on correcting these sorts of problems, which would seem to
> relate to the vertical alignment of the bottom 5' of mast in the rotator
> and through the thrust bearing.  I forget how much adjustment play there is
> in the rotator shelf mounting and don't know if you can adjust the the
> thrust bearing.
> I don't think anything is binding - cable wise or with my dipole arm mount
> - but I will need to check that out too.
>     Dana - K6NR
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