Now that I'm looking directly at the underside of my R390, it's unfortunate that they changed that assembly for the R390A. That clamp easily comes off from the front in the earlier model.
Good luck with it. The R390A's RF deck isn't really that difficult to remove. It would make any gear cleaning/lubricating a bit easier should you choose to do so. Since I don't have an R390A I can't tell but is that grip ring on the back of the gearbox all that difficult to remove with the geartrain in place? If not, then once the pin is removed from that collar, it might be the easiest to do it that way and the clamp would be easier to remove as well. I realize it would most likely require a 90-degree grip ring plier with short prongs, etc. Just a thought... Good luck with it. Barry - N4BUQ > Hi Jordan, > Not sure about this clamp ID, but it must have a 13/32" hole to fit the gear > part that it have to hold to the shaft. > See attached picture. > The ultimate problem that Paul is facing will be to remove the broken clamp > there without damaging anything else around. > Using a two-part clamp is a good idea, medium hard to machine, but there can > be other hidden mechanical damages in his set. > We never know what happened to these radios before. > To maintain (or restore) those requires both electrical and mechanical > skills. > > IMHO, Paul should attempt a gearbox disassembly, cleaning and reassembly > (Y2K-R3a manual Chapter 10). > At least, he will be able to catch any other marginal mechanical flaw within > during the process. > This is one of the worst case I seen so far: a clamp broken at the worst > possible place, but.. any other broken clamp within the gearbox will require > disassembly, anyways. > > There is other "stupid" damages I was able to see in my "spare" EAC RF deck > yesterday night: some of the clamp screws heads are "eaten" internally, most > probably because someone tried to use Allen bits instead of Bristol ones on > those. > That one will be due for a complete overhaul, I believe: it is completely > gummed up, also. > > PAUL: just a comment... > The answers you provided came to me OK directly to my email address, but the > same text did not "passed" thru the forum: the postings came to me "empty". > I cannot tell why, but have a check... > > 73, Jacques, VE2JFE in Montreal > > ______________________________________________________________ > R-390 mailing list > Home: http://mailman.qth.net/mailman/listinfo/r-390 > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
