TenTec
[Top] [All Lists]

Re: [TenTec] Argonaut 509 - PTO rebuild parts/instructions needed - stil

To: tentec@contesting.com
Subject: Re: [TenTec] Argonaut 509 - PTO rebuild parts/instructions needed - still possible? advice/recommendations?
From: wb0gaz via TenTec <tentec@contesting.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 21 Nov 2020 06:11:38 +0000 (UTC)
List-post: <mailto:tentec@contesting.com>
 Found that I had the ten-tec instructions in my file, so proceeded up to a 
point where I am stuck, so looking for advice:

PTO subassembly housing (that holds the coil and movable parts) removed from 
the 509 Argonaut without difficulty; all of the various small parts are stashed 
in small plastic bags.

(referring to the ten-tec instructions on PTO rebuild)

"Step 4. Push tuning shaft (J) back far enough to remove stop pin (H) using 
long nose pliers. Note the position of this pin as it must be put back in the 
same hole."

I am not able to push the tuning shaft (J) back (I presume by back, they mean 
push on it towards the rear of the radio) very far at all - certainly not 
enough to expose the stop pin so I can safely remove it (I assume the idea is 
to push the shaft back towards the rear until the stop pin is clear of housing 
so that the stop pin can be removed.)

The small-diameter inner shaft (where the PTO knob is attached) turns normally, 
but no movement is transmitted to the gear-reduced larger-diameter outer shaft 
(where the kHz ring and string wind-up goes), which I think is what actuates 
the PTO movement forward and backward for frequency change.

As far as I can tell, the root problem is that the "core drive rod (K)" - which 
is the larger-diameter shaft just behind where the PTO knob is attached - does 
not turn at all (certainly not by hand, and I've not tried using any tool to 
turn it because it seems very unwilling to rotate.) Turning this is necessary 
at step 7 so it can be removed from the assembly housing. I can't work out why 
it does not turn. What grease I've cleaned up so far seems normal consistency.

I can press the tuning shaft (J) in maybe 1/8", and I see the three ball 
bearings move back in their plastic housing, but they're not exposed enough to 
remove them.

Does this ring a bell with anyone? I'm stumped!

Thanks,

73 Dave WB0GAZ wb0gaz@yahoo.com



     On Friday, November 20, 2020, 08:06:37 PM MST, <wb0gaz@yahoo.com> wrote:  
 
  My Argonaut 509 (S/N 509-3xxx) has been in storage for a long time, and after 
unpacking it and putting it in line, I discovered the PTO (frequency dial, not 
the resonator rack) control is largely immobile. I suspect the PTO mechanism 
grease has gone bad and I'd need to remove the PTO, disassemble, remove the old 
grease, apply new grease, reassemble, re-install and realign.

All that said, the last time I did this (for another PTO-based analog Ten-Tec 
transceiver) was some years ago and Ten-Tec at the time could supply the needed 
materials and instructions.

I presume with Ten-Tec gone that I'm "on my own", so looking here for any 
advice as to how to proceed. I no longer have the materials (I recall a kind of 
green grease and a very small metal part) nor instructions (a few photocopied 
pages, which served well the last time I did this years ago.) 

The 509 seems otherwise to be in good shape, it's just stuck at xx.060 MHz or 
thereabouts.

Thanks for any suggestions!

73 Dave WB0GAZ wb0gaz@yahoo.com

    
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec

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