John Deere 820 Alternator help

[snowman4evr]

Was wondering if someone might be able to point me in the right direction in finding an alternator for this 820 Diesel Tractor. It appears to be all original wiring, but most of the new alternators iam finding are one wire.

 

[wore out]

Was wondering if someone might be able to point me in the right direction in finding an alternator for this 820 Diesel Tractor. It appears to be all original wiring, but most of the new alternators iam finding are one wire.


View attachment 110923

John Deere will no doubt have an alternator available, have you checked with a dealer? Probably be PRICEY, though!

Is there an I.D. tag on the unit, as a number of different alternators were used?

Below is a link to the official parts catalog, with the tractor serial number and any tag info off of the alternator you should be able to come up with part number, then GOOGLE it to see what's out there at a reasonable price vs. DEERE.

https://partscatalog.deere.com/jdrc...xOiNCVVNJTkVTU19SRUdJT04sNTAyNDpFUVVJUE1FTlRd

 

[Tx Jim]

Alternator for John Deere® Tractor, AL36391

John Deere®Tractors - 2030, 2840, 3030, 3120, 3130 Utility Tractors - 830, 2240 12 Volt

www.abilenemachine.com

$116 from Abilene Machinery

 

[BarnyardEngineering]

What are you searching for, and where?

You say "most" which implies not all. In that case, buy one of the ones that isn't one-wire. Are you going by pictures or description? On aftermarket parts sites, the picture does not always accurately depict the part. They show a picture of AN alternator, not THE alternator. You need to take a leap of faith and blindly order it hoping you get what you need. Calling and asking is hit-and-miss, because the person on the phone cannot possibly be an expert on every one of the 100's of 1000's of parts they sell.

 

[Gambles]

You showed us a photo, so I’m assuming that you have a physical alternator. Is there any chance that you have a local business that rebuilds alternators? That might be your best option.
That being said, the nearest starter/alternator shop that I use is about 90 minutes away, is closed on Saturday and the owner is one of the grumpiest men you’ve ever met.

 

[buickanddeere]

I bought an AI alternator for
My 1640 from Deere . Cost less than the jobber down the street .
It was also an upgrade from the original 35 amp to a 55 amp .

 

[Tx Jim]

I bought an AI alternator for
My 1640 from Deere . Cost less than the jobber down the street .
It was also an upgrade from the original 35 amp to a 55 amp .

How long ago did you buy your alternator? Before or after the China Flu Inflation?

 

[buickanddeere]

How long ago did you buy your alternator? Before or after the China Flu Inflation?

Come to think of it , probably 10-12 years ago .

 

[dbNga]

Was wondering if someone might be able to point me in the right direction in finding an alternator for this 820 Diesel Tractor. It appears to be all original wiring, but most of the new alternators iam finding are one wire.


View attachment 110923

Unless you're upping the electrical load on system I vote heavily in favor of having original rebuilt regardless of extra cost over replacement.

 

[snowman4evr]

Thanks everyone for the comments. Tx Jim I emailed Abilene Machinery to see if there alternator was indeed a 4 wire since it didnt show the back of it, but After doing a quick search, it turns out there is an alternator shop about 45 min away. Guess Iam gonna take a trip tommorow and get this odd alternator rebuilt. Never realized we had a place that close that rebuilds alternators.

 

[caterpillar guy]

Just a stab in the dark and with very little seen it could be a Bosch or Motorola alternators. I went through this on the 2940 to get an alternator that would work on it. Don't remember just what I wound up with now.

 

[wore out]

Thanks everyone for the comments. Tx Jim I emailed Abilene Machinery to see if there alternator was indeed a 4 wire since it didnt show the back of it, but After doing a quick search, it turns out there is an alternator shop about 45 min away. Guess Iam gonna take a trip tommorow and get this odd alternator rebuilt. Never realized we had a place that close that rebuilds alternators.

Did you ever take a close look to see if an I.D. tag is visible/readable on the alternator?

 

[buickanddeere]

I bought an AI alternator for
My 1640 from Deere . Cost less than the jobber down the street .
It was also an upgrade from the original 35 amp to a 55 amp .

L

Unless you're upping the electrical load on system I vote heavily in favor of having original rebuilt regardless of extra cost over replacement.

35 amps is pretty scrawny for an odd jobs putting around tractor in cool weather . 55 amp is more like it .

 

[buickanddeere]

Just a stab in the dark and with very little seen it could be a Bosch or Motorola alternators. I went through this on the 2940 to get an alternator that would work on it. Don't remember just what I wound up with now.

Being a Canadian 1130 from Mannheim . Odds are the electrical system is Bosch .
Thank Goodness that Deere did not use Lukas Electric .

 

[Jim.ME]

JD parts show Bosch systems (generator and alternators) for the 820s. The picture very much appears to be a Bosch. AL36391 looks like it has the battery connection and 3 spade terminals, similar to his picture. If the repair shop he is taking it to works out, he should be set.

 

[wore out]

JD parts show Bosch systems (generator and alternators) for the 820s. The picture very much appears to be a Bosch. AL36391 looks like it has the battery connection and 3 spade terminals, similar to his picture. If the repair shop he is taking it to works out, he should be set.

I agree. The only issue/reason I was asking for a unit number would be if his particular alternator has an external VR he would need to take it along to the alternator shop, doesn't seem likely from the parts lookup, on the other hand, the alternator in his photo LOOKS like it has a brushholder with terminals for an external VR, rather than a brushholder/VR combo.

I have found sometimes parts details are not always clear on these Euro DEERES.

 

[snowman4evr]

Well thought I would post a little update. It turns out from my next state over alternator rebuild shop, that my alternator was good after all! He said I needed to look at my voltage regulator, as this alternator was not internally regulated. I hadnt even thought to look for a regulator, and it took me a minute to find it.
I have never met a nicer gentleman. Even if didn't need my alternator repaired, I really enjoyed talking with the guy. I asked the guy what I owed him, and he said "Happy Easter."
I wished I had seen Wore outs post before I headed out. Turns out you were spot on. Yesterdays tractor forum is a vast wealth of knowledge!

Rainey's Generator & Starter in meridian Mississippi.​

 

[Jim.ME]

Thanks for the follow up.

 

[wore out]

Well thought I would post a little update. It turns out from my next state over alternator rebuild shop, that my alternator was good after all! He said I needed to look at my voltage regulator, as this alternator was not internally regulated. I hadnt even thought to look for a regulator, and it took me a minute to find it.
I have never met a nicer gentleman. Even if didn't need my alternator repaired, I really enjoyed talking with the guy. I asked the guy what I owed him, and he said "Happy Easter."
I wished I had seen Wore outs post before I headed out. Turns out you were spot on. Yesterdays tractor forum is a vast wealth of knowledge!

Rainey's Generator & Starter in meridian Mississippi.​

Thanks for posting the "Rest of the Story"!

 

[rustred]

all the 820's i have seen have generators.