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

[KA9EGW]

You know, if you don't want to disassemble the geartrain, an appropriate
size 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 such
an animal...Small Parts Inc or Stock Drive Products or...?

73, Brian KA9EGW


-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto: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/slipping
clamp on 4-8 mhz cam shaft.




----- Forwarded Message -----
From: Terrence Harvey <terrencelharvey at yahoo.com>
To: R-390 Mailman <R-390 at Mailman.qth.net>
Sent: Tuesday, May 15, 2012 10:07 AM
Subject: [R-390] Fw: R-390A Teledyne '63 contract with broken/slipping clamp
on 4-8 mhz cam shaft.

 
Greetings All;
 
       I 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
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