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

[Terrence Harvey]

All;
 
      Recently developed a problem with subject unit which has been basically my daily driver hf receiver.  Noticed the MC change knob/veeder root 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 in frequency. Upon observing the cam alignment marks at 7+000 I noticed that the 4-8 mc cam was off align mark on face of  gear train cover.  Loosened 4-8 cam clamp and repositioned it to align with mark on gear train cover and re-tightened clamp. Tuned the kc control and observed the 4-8 gear turned but cam shaft did not. Both open ends of the clamp are butted against each other 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 know method of removing old clamp and replacing it. Have researched y2k rf deck/gear train sections of the documentation, but yet to find a section addressing just the replacement of the 4-8 mc shaft clamp. 
 
Any help or suggestions regarding the band segment deafness and replacement of the 4-8 mc shaft clamp would be very much appreciated.
 
Thanks and Regards,
 
Terry Harvey
Crystal lake, IL