[GreenKeys] Dashpot

[Nick England]

The cup part number 150975 didn’t change from early to late. Don’t know
about the material. Paul Cembura might know from looking in his parts bin.

A quick search in my manuals didn’t turn up any reference to a change in
materials.

Anyway, Jim, try a new cup from Paul.
https://www.johnwhitney.com/misc/paul-rtty.htm


Nick England K4NYW
Chapel Hill NC
www.navy-radio.com


On Thu, Oct 23, 2025 at 9:36 AM John, W9DDD <w9ddd at tapr.org> wrote:

> The cup, I've even had at least one NOS cup that didn't help.  At the
> moment I'm not remembering what the difference was.  Was there a change
> in material at some point in time?
>
>
> On 10/22/2025 9:21 PM, hwhall--- via GreenKeys wrote:
> > It does sound like the seal is deteriorated.
> >
> > Wayne
> > WB4OGM
> >
> > On Wednesday, October 22, 2025 at 07:20:36 PM MDT, Jim <
> kd9do.jim at gmail.com> wrote:
> >
> > Hello Greenkeys!
> > Long time listener, first time caller. A little over a year ago I
> acquired a M28 ASR. Since that time I have been cleaning it up, fixing the
> ESU – rectifier assembly, learning how it is wired and testing. There is
> one item that has me stumped. The dashpot does not seem to want to work as
> it should preventing carrier bounce on return from a long line of text.
> This is when printing multiple long lines at 60 WPM.  I have the service
> manual and followed that, removed the dashpot assembly, cleaned and
> replaced, no luck. I did not lose the screw, nut, small spring or the tiny
> little ball. Reassembled all parts and tried adjusting according to the
> documentation, tested, but still no luck. The best I can get it adjusted is
> so that lines of text of about 60 characters or less will do just fine when
> executing a return but much beyond that and the carrier will bounce 2 to 4
> characters at the start of a line. I’m wondering if the dashpot cup
> [plastic, rubber?] is worn out and needs to be replaced. I look forward to
> any suggestions that will help this little guy get back to doing his job
> like I’m sure he did at one time. Thanks in advance for your assistance.
> > 73,
> > Jim - KD9DO
> >
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> --
> ---
> ----
> The above comments or recommendations are SWAG. Use at your own risk.
>
> John, W9DDD
>
>
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