[Top] [All Lists]

Re: [TowerTalk] US Tower HDX572

Subject: Re: [TowerTalk] US Tower HDX572
Date: Tue, 18 Sep 2012 09:14:57 -0400 (EDT)
List-post: <">>
Hi Tom, before giving up on the existing motor, you might try to revive it. 
If you can rotate the motor shaft by hand, it highly likely something is  
wrong with the start circuit.
These motors have separate start and run windings. The start winding has a  
centrifugal cutout switch wired in series to disconnect the winding when 
the  motor comes up to speed.
I Have seen many times, critters build a nest inside the motor that blocks  
the cutout switch in the open position preventing the motor from starting.
This scenario can be tested by removing the drive belt from the motor and  
manually rotating the shaft while power is applied. If it takes off and 
runs,  the start circuit is not functional. 
The cutout switch is accessible by removing the four long screws holding  
the rear bearing plate to the motor and prying the plate off. If you see webs 
or  mud deposits, there have been unwelcome visitors building nests and all 
that  debris has to be removed.
There is also a possibility that the starting capacitor has gone bad. It is 
 wired in series with the same cutout switch and can prevent the flow of 
starting  current.
I have seven of these type motors in various az and el drives for my eme  
station and it is a typical year for one or two of them to fail and require 
the  above cleaning procedure to restore them.
I would think a local motor shop could repair your motor as well if you  
don't feel you can handle it.
Gerald K5GW
In a message dated 9/18/2012 7:46:01 A.M. Central Daylight Time, writes:

Hi  Everyone,

I've been busy for the last six weeks or so getting a used US  Tower HDX-572
ready to go up.  I tested the raising motor yesterday,  and found that it is
dead.  The motor itself is part of the US Tower  MDPL-1000 lift apparatus
that is attached to my tower.

I cross  referenced the Leeson Electric motor - part number 1100018.00 (this
is the  motor that has failed) on Google.  I found several vendors online
that  sell the same motor with seemingly identical specs.  I'm no  electric
motor guru, but I know there are various engineering  considerations.  Does
anyone have any words to the wise as far as  ordering one of these available
motors?  Does anyone recommend  anything else, and/or have success stories
from past experiences with  failed tower motors?

I'm very appreciative of any assistance that can  be  rendered.




TowerTalk  mailing  list


TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>