[R-390] backlash on R390A

[jonklinkhamer at comcast.net]

Hi Barry,

Yes you're right it's more of a recoil as you described. I have not checked for broken clamps but I will. I may have to clean a little there is lots of dry up grease. I have a busy schedule this week but hope to get back on it soon. Will definitely use your procedure and see what turns up.

As far as the RF Deck. If you let me know the shipping cost and address I'll get something out this week to you for sure. 

Thanks for all your help and the groups,

Jon,KB1DC
-------------- Original message -------------- 

> Hi Jon 
> 
> I might know a thing or three about ATC -- I took over the R-390A (and some 
> other type) parts inventory on consignment. While you can order through the 
> ATC website, better to just directly email me as it avoids delay. 
> 
> The RF decks are as pictured -- missing all the coils, slug racks and a lot 
> of other parts, but virtually all the gears and clamps are there. Some have 
> a few slugrack springs still hanging on. They also have (mostly) good 
> Veeder-Root counters, however the thin aluminum masks are a bit mangled on 
> most all of them. 
> 
> I doubt if either the missing Oldham coupler spring or slugrack spring has 
> anything to do with the backlash you previously described. The spring on 
> the coupler just takes up some residual slop between the gear train and the 
> PTO and is basically and anti-rattle spring. The missing spring on one slug 
> rack might tend to cause that slug rack to hang up on the downstroke, but 
> unlikely to be the culprit. If anything the backlash originates from the 
> pull of the backlash springs, so one less ...? 
> 
> Did you check for a broken or loose gear clamp as I/we described? 
> 
> You have to work the KC through full cycle and watch two or three things at 
> a time as you do, especially at the points where that backlash occurs. I 
> think what you told us was that the KC knob actually spins back a bit, 
> right? That's more of a recoil (as in recoil starter) than backlash, which 
> is a slight creeping off the set frequency. 
> 
> Barry 
> 
> 
> ----- Original Message ----- 
> From: "Jon" 
> To: 
> Sent: Sunday, August 28, 2005 9:11 PM 
> Subject: [R-390] backlash on R390A 
> 
> 
> > 
> > Hi Folks, 
> > 
> > This weekend was a crash course on the RF Deck. After reviewing the 
> > manual(s) and Chuck's video, I finally got enough nerve to take out the 
> > deck. Two things I immediately noticed. First the spring for the Oldham 
> > Coupler is missing - gone. No I did not do it - really. Also on one of the 
> > slug racks a tension spring is also missing. These especially the former 
> > might be the perpetrator of why I'm seeing so much backlash. I'm now at 
> > the 
> > mercy of finding parts. I don't necessary like that feeling but it goes 
> > along with repairing/restoring boatanchors I guess. I noticed 
> > www.atc-us.com 
> > is selling a deck for $35. I'm thinking I might 
> > need the gears and clamps depending on what I find. Does anyone have much 
> > experience dealing with this company? Is there anybody in the group that 
> > could sell me an anti-backlash and tension spring(s)? Being always the 
> > optimism, I feel good that this may solve the problem. 
> > PS: While cleaning the dirt off the chassis where the RF deck was I 
> > noticed 
> > a message scribed into the metal. It read "Bud was here 30 Nov 69" Bud 
> > if 
> > you're out there thanks for serving and God bless you! 
> > 73's 
> > Jon,KB1DC 
> > 
> > 
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> 
>