[Collins] 70K-2 PTO

[Rodger]

Hi David,

There are a few things to try:

1.  You can loosen the panel bushing that the tuning shaft goes through 
and move it slightly to increase the drive coupling.

2.  You may need to loosen the screws that hold the PTO to the chassis 
and shift it slightly if there is binding.

3.  You might need to lubricate the PTO as I did in my (older) KWM-2.  
You do not need to unsolder the PTO cable to do the lubrication, there 
is room within the KWM-2 to clean/lube without problem.  You will need 
to remove the bar holding the adjustable pots from above the PTO and 
then it is easy to get the PTO loose.  See:  
http://www.collinsra.com/cra_album/0002/cra_0002.html  for some great 
info on cleaning/lubricating.

Having done the relube on my KWM-2, 32S-3, and 75S-3 I can assure you it 
makes a big difference in tuning feel and the tuning is very smooth now.

73, Rodger WQ9E

David Murman wrote:
> I have a KWM-2A RE that was built about 1972 and when I rotate the 
> main tuning dial there are areas  that the knob moves but the 
> frequency does not unless you put pressure on the tuning knob. Makes 
> it difficult to tune in a sideband signal. I have tried to tighten the 
> bushing but doesn't seem to help and if you get it off the wheel it is 
> a bear to get back on.
>
> Will this remedy the problem I have or can someone point me in the 
> right direction. I have a 312B-5 that I use for the transmit side.
>
>
>>> Finally, I have discovered that the PTO turns ever so nicely if you 
>>> remove
>>> one of those cupped washers from the front of the lead screw.  If 
>>> there is
>>> tension at this point, no amount of adjustment  of the concentric 
>>> bushing
>>> nut will give you that wonderful inertia feeling at the tuning 
>>> knob.  The
>>> shaft should turn quite freely, almost effortlessly or whatever I am 
>>> trying
>>> to saying!
>>
>> Reducing the end load on the PTO shaft means it will drift more from
>> vibration and be be more apt to move the PTO slug when you push or pull
>> on the knob (or have the rig mounted in Art's yacht).
>
>
>
> Thanks;
> David
> WA4ECM
>
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