[GreenKeys] LMU 11 motor

[Duncan Brown]

Thanks for all the comments on my motor problem.  I am assuming that it 
is the Motor Start Cap (may well be that you can't hand-start a 1/12HP 
motor) and have ordered a new cap form ebay. Should be here in time to 
take it to the Museum on Tuesday and try it out.

Thanks & have fun,

Duncan
K2OEQ

On 03-Aug-22 07:56, John W9DDD wrote:
> Bruce's comments made me think about the differences between the 1/20 
> and the 1/12 HP motors.  My experience with spinning the fan to get a 
> motor going has been limited to 1/20 HP motors. The 1/12 HP might not 
> be capable of being spun up by hand with a bad cap or relay.  The RT 
> set uses a 1/12 HP.
>
> John, W9DDD
>
>
> On Aug 3, 2022, at 6:32 AM, Nick England <navy.radio at gmail.com> wrote:
>
>> Finding a modern cap that will fit seems to be impossible.
>>
>> I did find a source of NOS 125v 88-108 mfd motor start caps that seem 
>> to work fine.
>> 1" dia x 2.4" long so they fit OK.
>> http://www.ebay.com/itm/141022712790
>> or
>> http://www.tedss.com/181384
>> Mine came quickly and were very well packed.
>>
>> It turns out that these are Teletype Part 181384 as used in the M33. 
>> Also suitable as a substitute for 162074 used in 1/40 HP miniature 
>> motor M28 TD and ROTR equipment (I just cut the wire leads short and 
>> soldered to them).
>>
>> They also work OK in the 1/20 HP motors in the 28KSR and 28RO. Not 
>> the correct value but I have replaced several with no issues. I 
>> haven’t tried them in the 1/12 HP motor in the 28ASR which uses yet 
>> another value cap.
>>
>> The motors with bad caps would just sit and tremble until I gave the 
>> fan a quick pull and then they would spin up OK.
>>
>> YMMV, no warranty, etc.
>>
>> Nick
>>
>> -- 
>> Nick England K4NYW
>> www.navy-radio.com <http://www.navy-radio.com>
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