[GreenKeys] grunting 28 KSR?

[Don Robert House]

Eugene,

I think you may have a clutch problem.  If the stop lever gets wedged  
or the shoes get worn or a spring breaks the motor may try to latch  
them all and if it cannot... excessive drag can do bad things such as  
almost stopping the motor or stripping the intermediate gear.  Take  
out the typing unit turn in upside down and turn the main shaft over  
by hand slowly and watch for anything unusual.  You might do the same  
thing with a known good typing unit to see any differences.  Also  
always look for broken pieces in the base when you remove a typing unit.
Lubricate all of the wicks in all of the clutches.

Don



On 2 Jun 2006, at 8:25 PM, Eugene Hertz wrote:

Hello again,

Yes I am knee-deep in learning about my 28 KSR and ASR and trying to  
fix some anomolies.  I have two new questions.

1. Grunting: Seems my KSR with the 3 speed gear shift very often goes  
into a grunting mode, very often every other character. The grunting  
sounds like a seal barking but with every rotation of the motor (or  
some shaft). I thought it might be the gearshift because the grunting  
only takes place at 60wpm. Anything faster makes no sound.

I took the printer out and when I operate the main shaft from the  
motor, all seems very smooth. However, the keyboard shaft seems to  
rotate freely until a certain position, then it seems to rotate with  
quite a bit of rubbing, perhaps a clutch of some kind? Performing the  
same experiment on the ASR gives very simiar results, except that  
when the keyboard shaft goes into "tough to turn mode" it seems to  
rotate more smoothly, the KSR has more "grab" Could it be that at  
higher speeds the grabbing is less vibrational? At 60wpm its slow  
enough to cause the grabbing to make an audible vibration? Very  
audible, btw. My wife usually comes in asking which of our children  
I'm choking!

So, as my first experiment, I thought I would lube the shaft. It  
seems the shaft has a hole in it, and almost looks like some kind of  
wick or something inside. So my question is, how does one lubricate  
this? Does one apply oil in the hole in this shaft? Does one use  
grease somewhere?

2. 28 ASR motor spazzes out.  It seems there are times that the motor  
in the asr, instead of rotating in one directions, seems to vibrate  
or rock back and forth. While this is occuring, the lights in my  
shack dim. If I leave it in this state long enought, it will  
eventually catch and spin properly.  At first I thought something was  
binding, so I removed the printer and it still did this (not always,  
but several times a week).  I rotated the motor by hand and there  
appeared to be no binding.  Eventually, the motor kicked in, I check  
again bby hand (with power off) and the motor seemed to turn as  
freely when its working as when its not. So I am suspecting something  
wrong with the motor.  I was wondering, could there be a starting  
capacitor involved here? Could that be failing?

THANKS!
Now back to my regularly scheduled teletype challenges!


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