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post #1 of 9 Old 09-05-2019, 05:28 PM Thread Starter
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John Deere 111 Charging Problem

Hi Everyone

The JD 111 (vintage 1985) that I recently acquired seems to have a charging problem.

Starting with a fully charged battery, the mower shuts down after about an hour of work and won't restart unless I put the charger on the battery for a while. It then restarts and goes through the same scenario.

The voltage at the battery with the mower running is 12.1 - 12.5 v.

I don't find a voltage regulator on the unit so I believe the stator feeds the battery through a diode.

I've attached a photo of what I think is the diode. The red wire is connected to the starter solenoid.

When I disconnect the red wire from the connector with the engine running, I read no voltage coming from the stator. Nor do I read any voltage at a point under the black electrical tape.

A new stator appears to include a new diode.

A stator is fairly expensive and I'd like to have a second opinion before I dive in to replace the part.

Does anyone on the forum have an opinion?

Thanks.

Barry
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post #2 of 9 Old 09-05-2019, 05:32 PM
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Re: John Deere 111 Charging Problem

Remove the flywheel and inspect. The stator may on fact be good, but the magnets on the flywheel have fallen off. May need to glue them back on.

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post #3 of 9 Old 09-05-2019, 05:34 PM Thread Starter
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Re: John Deere 111 Charging Problem

Thanks - I'll give it a shot.
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post #4 of 9 Old 09-05-2019, 05:42 PM
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Re: John Deere 111 Charging Problem

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Originally Posted by barryell View Post
Thanks - I'll give it a shot.
You can also check the resistance of the stator. Its a low ohm reading, you might read something like 0.7ohms or there abouts. If it shows open (infinite ohms) then you know there is a break in the coil somewhere. You need to measure without the diode in place.

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post #5 of 9 Old 09-06-2019, 04:53 AM
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Re: John Deere 111 Charging Problem

If you have the original engine (and stator) the diode will be in the wire going from the stator connector to the solenoid. You should be able to check AC voltage at the stator connector to ground. Here are 2 threads to look through.
https://www.mytractorforum.com/12-jo...ing-issue.html
https://www.mytractorforum.com/12-jo...g-problem.html
You may also want to download this PDF. https://www.briggsandstratton.com/co...ifications.pdf
Cannon
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post #6 of 9 Old 09-07-2019, 07:22 PM Thread Starter
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Re: John Deere 111 Charging Problem

Thanks to Bassguitarist1985 and Cannon51 for quick responses to my call for help.

Following is a recap of test and inspection results and a solution to the problem:

1. No DC voltage at the connector in the red wire
2. No AC voltage between stator and diode
3. Stator resistance is 0.7 ohms
4. removed flywheel and magnets are intact
5. Wire from stator was crushed behind starter motor bracket and sheared off about 3/4 inch from stator by contact with the flywheel - obviously routed improperly

New stator on order.

Thanks again for the help
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post #7 of 9 Old 09-07-2019, 07:39 PM
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Re: John Deere 111 Charging Problem

Quote:
Originally Posted by barryell View Post
Thanks to Bassguitarist1985 and Cannon51 for quick responses to my call for help.



Following is a recap of test and inspection results and a solution to the problem:



1. No DC voltage at the connector in the red wire

2. No AC voltage between stator and diode

3. Stator resistance is 0.7 ohms

4. removed flywheel and magnets are intact

5. Wire from stator was crushed behind starter motor bracket and sheared off about 3/4 inch from stator by contact with the flywheel - obviously routed improperly



New stator on order.



Thanks again for the help
Any wire left where you can resolder some new wire on and shrink wrap it to prevent it shorting? Or is it completely mangled unable to be saved?

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post #8 of 9 Old 09-07-2019, 08:09 PM Thread Starter
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Re: John Deere 111 Charging Problem

Bassguitarist1985 -- I was hoping for that, but it was sheared off right at the connection to the stator. Diode was also shorted.
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post #9 of 9 Old 09-20-2019, 12:43 AM Thread Starter
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Re: John Deere 111 Charging Problem

New stator arrived, installed, and all seems to be well.

After everyone's help on the forum, while waiting for the stator to arrive, I watched several videos about installation of the new stator.

As it turns out, the failed stator was installed upside-down with the output wire in contact with the flywheel - hence the flywheel sheared it of.

Also the wire was routed behind the starter bracket (as it should be), but it was crushed by the bracket.

I mowed the field today and I'm a happy camper

Thanaks again to all who chimed in.

Barry
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