[R-390] R-390 (non-A) Frozen Zero Adjust Clutch

k1jos at att.net k1jos at att.net
Sun Nov 10 17:07:40 EST 2024


 

My Zero Adjust mechanism is frozen. I have removed the c-clip (#20) and
tried some penetrant oil at the various sliding contact points without
success.   I think the 4 clutch plates (#11) are stuck together and are not
sliding back to disengage when the knob is tightened.  The only instructions
I have found are in the Fourth Echelon repair on p77 and p 175  in TM
11-5820-357-35.  The removal instructions start by saying to first remove
the RF sub-chassis and 8 slug racks.  However, looking at the blowup and
instructions, the parts for the clutch mechanism appear independent of the
RF gear train except at the front VFO gear.  Has anyone removed the clutch
plates on a R-390 (non-A) without removing the RF chassis and gear train?

 

Thanks in advance !

 

Jerry  



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