[AT] Not quite an antiques problem...

[John Maddock]

Thanks Dennis. Good point to check.  Ya can't see where the tricky 
electrons are going these days! :-)




------ Original Message ------
From: "Dennis Johnson" <moscowengnr at outlook.com>
To: "Antique Tractor Email Discussion Group" 
<at at lists.antique-tractor.com>
Sent: Tuesday, 20 Dec, 2022 At 1:37 PM
Subject: Re: [AT] Not quite an antiques problem...

John,

I had a Start/Stop issue come up today. Not sure if this relates to your 
situation, but is worth sharing anyway.
I was moving my Hustler Super Z out of the way so I could get tractor 
out of the garage and clean up to insulate walls. Got the Super Z to 
start, and then would initially, but die whenever I moved a lever. Found 
out the key was sticking in the start mode, so when I moved any lever, 
the “do not start with drive engaged” circuitry kicked in and killed the 
engine. Restarted and manually moved the key to the run position and all 
was well. (On the Super Z) Not sure this is your issue, but easy to 
check.
Went to start my IH 2504 and not so good luck. It is not firing. 
Guessing I need points and condenser, but was in a hurry so I pulled it 
out of the shop for now,
Does anyone know if there is a conversion kit to switch out points to 
some electronic pointless system to make spark on an IH 2504 or 504 
tractor??

Thanks
Dennis


Sent from my iPad

> On Dec 19, 2022, at 2:54 PM, John Maddock <agtronixjv at bigpond.com> 
> wrote:
>
> 
> ....but a puzzle for the brains trust, never the less!
>
> JCB JZ140 excavator, (9500 hrs) electrical problem.
>
> Briefly:  machine has not been used for most of the winter, but I’ve 
> topped up the batteries twice each month.  Noted at the last charging 
> session a week ago that  one of the batteries took a long time to 
> reach full charge.
>
> Today, the electronic monitor screen showed low battery voltage & the 
> starter motor refused to operate.
>
> Connected 24v from external batteries & everything sprang to life as 
> normal.
>
> Moved the machine maybe 5.0 m to lift and reposition some equipment, 
> then moved it 5.0m back again, the engine running for maybe 15 mins. 
> Aircon was on at the same time to wet the compressor seals.  Decided 
> to check the battery state, so killed the engine and re-started it - 
> just.  Tried again, and the screen showed low battery voltage and 
> flywheel sensor fault.
>
> Reconnected the jumper batteries - and observed the following:
>
> 1. “Dead” electronic monitor unit; no screen, no symbols.
> 2. A very dim LED on the Emergency Stop button. (Usually, that has to 
> be used as well as the switch to stop the engine. No idea why; been 
> that way since I bought the machine).  In addition, pressing the 
> button did not switch off the dim LED, as it normally would.
> 3. The engine starts - and stops instantly.
> 4. The throttle arm does not move; it is unclear if it remains in the 
> “engine stop” position and as a result the engine is somehow running 
> briefly on residual fuel.  The run/instant stop is repeatable, not a 
> oncer.
> 5. Switching to “limp mode” makes no difference to any of the above.
>
> I’ve:
> 1  checked the fuse for ECU-STD, EMS Battery Supply; multimeter said 
> its ok.
> 2 disconnected the onboard batteries; now running completely on fully 
> charged, external, jumpered batteries.
> 3 Read the service manual carefully.  It suggests checking 
> input/output voltages at several input/output points on the ECU.
> Considering Farmer's frequent calls "Check the grounds, check the 
> grounds" does this sound like an earthing fault at a point common to 
> all the observed irregularities?
>
> JV
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