[R-390] Fw: Fw: R-390A Teledyne '63 contract with broken/slipping clamp on 4-8 mhz cam shaft.

[Barry]

One thing to watch for on replacement clamps is the thickness.  I had an R390A that someone had replaced the original clamps with "homemade" two-piece clamps.  They worked very well but as I recall there were places where the width of the clamp just barely cleared the cams/gears/plates on either side.

Good luck with it.

73,
Barry - N4BUQ


 On Tue 15/05/12  7:00 PM , "KA9EGW" ka9egw1 at britewerkz.com sent:
> You know, if you don't want to disassemble the geartrain, an
> appropriatesize two-piece clamp on shaft collar, somewhat along these lines:
> http://www.mcmaster.com/#split-shaft-collars/=hjuil5
> Although I doubt McMaster-Carr has one in the bore size you need, whose
> exterior dimensions are small enough.  But I'm confident someone makes
> suchan animal...Small Parts Inc or Stock Drive Products or...?
> 
> 73, Brian KA9EGW
> 
> 
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net [r-390-bounces at mailman.qth.net]On Behalf Of Terrence Harvey
> Sent: Tuesday, May 15, 2012 3:02 PM
> To: R-390 Mailman
> Subject: [R-390] Fw: Fw: R-390A Teledyne '63 contract with
> broken/slippingclamp on 4-8 mhz cam shaft.
> 
> 
> 
> 
> ----- Forwarded Message -----
> From: Terrence Harvey ter
> rencelharvey at yahoo.com>To: R-390 Mailman R-390 at M
> ailman.qth.net>Sent: Tuesday, May 15, 2012 10:07 AM
> Subject: [R-390] Fw: R-390A Teledyne '63 contract with broken/slipping
> clampon 4-8 mhz cam shaft.
> 
>  
> Greetings All;
>  
>        I recently developed a problem with subject unit which has
> beenbasically my daily driver hf receiver.  Noticed the MC change
> knob/veederroot display moves (comes out of detent) when tuning KC knob on some
> bands.Also, upper frequencies of some MC bands ( specifically 3.93-4.0 mc, 7.45
> -8.0 mc, 15.3-16.0 mc and possibly others) goes deaf as kc knob tuned up
> infrequency. Upon observing the cam alignment marks at 7+000 I noticed
> thatthe 4-8 mc cam was off align mark on face of  gear train cover. 
> Loosened4-8 cam clamp and repositioned it to align with mark on gear train cover
> andre-tightened clamp. Tuned the kc control and observed the 4-8 gear
> turnedbut cam shaft did not. Both open ends of the clamp are butted against
> eachother and thus will tighten no further.
> Can not see that the clamp is cracked or broken, but that is my
> assumption.I have some good replacement clamps to replace this one with, but don't
> knowmethod of removing old clamp and replacing it. Have researched y2k rf
> deck/gear train sections of the documentation, but yet to find a
> sectionaddressing just the replacement of the 4-8 mc shaft clamp. 
>  
> Any help or suggestions regarding the band segment deafness and
> replacementof the 4-8 mc shaft clamp would be very much appreciated.
>  
> Thanks and Regards,
>  
> Terry Harvey
> Crystal lake, IL
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