There is a dedicated Tentec Argonaut site found at:
https://groups.io/g/TEN-TEC-Classic-Argonauts. ; You may find more or
dedicated information on this site.
73
Bob, K4TAX
On 11/21/2020 12:11 AM, wb0gaz via TenTec wrote:
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
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