[TowerTalk] Replacement crank up motor

[TexasRF--- via TowerTalk]

>From personal experience, the motor failure could be as simple as insects  
jamming the starting switch inside the rear end of the motor. It could also 
be  due to bad starting capacitor which is easily replaced.
 
Once the drive belt is removed some tests can be made that will give a  
hint if this is the problem. Connect a temporary AC power cord to the run  
winding and plug it in to an AC outlet. Then quickly spin the motor shaft by  
hand to see if the motor runs. It can be checked for both clockwise and 
counter  clockwise rotation. The run winding will show a small resistance between  
terminals. The start winding will appear as an open circuit due to the 
series  starting capacitor. 
 
If the motor runs, it is virtually certain that the start winding  
disconnect switch is not making proper contact or the start capacitor is bad. At  
that point, you can proceed with disassembly, inspection and repair or take it 
 into a motor shop for service.
 
If the motor actually needs replacement, the motor shop can fix you up or  
take it by a Grainger store and get some help selecting a replacement.
 
If you are savy, you can find a replacement on Ebay and save some $$.
 
In this part of the country Mud Wasps love to build nests inside electric  
motors. Have repaired many motors as a result.
 
Hope this helps.
 
73,
Gerald K5GW
 
 
 
 
 
 
In a message dated 5/13/2014 2:12:26 P.M. Pacific Daylight Time,  
nv8a at charter.net writes:

Julio:

Are you sure you can't get a local repair shop to  rewind the motor or 
replace the capacitor or brushes (if it has the  latter), or whatever it 
needs?

73

Alan NV8A


On  05/13/14 04:25 pm, Julio Peralta wrote:
> I think I have a client with a  bad crank up motor on a 55' US Tower. Has
> anyone out there had to  replace one of these and if so where you able to
> find a suitable  replacement at a place like Grainger. If you have a 
brand,
> model or  part number that would be much appreciated.
>
>
>
>  Julio, W4HY
>
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