Re: (ET) new relay in - now no reverse

["RJ Kanary" <rjkanary nauticom net>]

          No. You are just one step closer to eliminating all the problem 
causing gingerbread that this control scheme has to offer. <VBG>
      Most of the E-12S / E-15 tractors that I have performed other repairs 
on, the time delays never worked.Must be those Apollo Era unijunction 
transistors.
      Interestingly enough, the magazine articles about the first 
generation E-20 mentioned the test driver/ engineer types routinely going 
from forward to reverse without letting off the throttle.Allegedly, this did 
not induce any failures in testing.
        Before you try this, however,bear in mind this stuff was brand new 
then, not aged for 30 some years.
   Plus, these units have armature contactor directional control.


----- Original Message ----- 
From: "Michael S Briggs" <msbriggs alberti unh edu>
To: "David C Robie" <mycroftxx1 juno com>
Cc: <rjkanary nauticom net>; <elec-trak cosmos phy tufts edu>
Sent: Sunday, August 06, 2006 9:45 AM
Subject: Re: (ET) new relay in - now no reverse


> On Sat, 5 Aug 2006, David C Robie wrote:
>
> > I wouldn't do that temporary fix.  You may forget to wait some day.
>
> It would only be for using it today to mow the lawn, since I'm expecting 
> to have card 1 fixed by next week, so I could put it back to normal.
>  If I do switch to quickly, the result, I *think*, would be a big current 
> spike in the field coil, which would fry the reverse relay - although I 
> have put a 10 A fuse in that line where it connects to the relay, so 
> hopefully the fuse would blow instead of the relay.
>  Would there be any other potential problem?
>
> Mike