[AT] JD 620; now starting engines

[Darrell Ratliff]

I worked with a Farmall Cub that did the same thing.  When I load-tested the battery it was marginal at best and cranking voltage was low enough that insufficient spark was generated.  A fresh battery cured the problem and it starts normally now.


From: Bo Hinch 
Sent: Friday, November 21, 2014 9:36 AM
To: Antique tractor email discussion group 
Subject: Re: [AT] JD 620; now starting engines

Herb , I have found that when you turn loose of the key ( in start mode )
and the engine starts , it is because there is POSSIBLY a dropping resistor
inline between the ignition switch and coil and the starter is using up
most of the current . Without having a wiring diagram to look at and if it
were me , I would perform a simple test of making a temporary jumper wire
to run between hot side of battery and ignition coil . Hook it up and try
to start and see what happens . If it starts while the engine is turning
over , I would say it does have a dropping resistor or a bad / dirty
connection in that circuit . If it starts the same as always , then you
have a weak battery . One last comment before the negative discussion
starts about the dropping resistor in a 6 volt system  , yes , some
equipment did use them from the factory , WHY ? I don`t know .  Just my two
cents worth .
Bo Hinch in S/W Louisiana

On Fri, Nov 21, 2014 at 7:32 AM, Herb Metz <metz-h.b at comcast.net> wrote:

>
> Dean Vinson & Others,
> I certainly agree with your being pleased about engines starting; I will
> put
> up with
> several other shortcomings as long as a tractor engine readily and
> consistently starts.
> My D-14 Allis needs ring gear replaced but I don't mind having to rock it
> occasionally
> when starter hits a couple bad teeth, because it otherwise always readily
> starts.
>
> Some time ago someone called attention to the design of most engines is
> such
> that
> starter takes much of the power from battery thus reducing power available
> for ignition
> circuit.  I hit the starter for two to three seconds, then let go of the
> (turn to start) key,
> and then notice that is when engine starts.
> On that basis, adding a separate battery just for starting would be a good
> idea if one
> had a hard to start tractor and did not want to get rid of the tractor?
> Herb
>
> -----Original Message-----
> From: Dean Vinson
> Sent: Friday, November 21, 2014 7:56 AM
> To: 'Antique tractor email discussion group'
> Subject: Re: [AT] JD 620 / charging six-volt batteries
> Thanks for all the good replies, gentlemen.  Consensus certainly seems to
> be
> that I can just charge the two batteries together as a single 12-volt
> battery.
>
> <snip>
>
> I have to say I was pleased that it fired right up last
> night when I went to move the brushhog to a better winter-storage location;
> the weather's been way cold for this time of year, single-digit temps or
> nearly so every night for the past few days, and I hadn't run the tractor
> in
> a couple of weeks.
> Dean Vinson
>
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>
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