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
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.
In a message dated 9/18/2012 7:46:01 A.M. Central Daylight Time,
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