Alternator not spinning…

hopeso

I replaced an alternator on a tractor around a year ago. I was working the tractor yesterday when the battery warning light came on. When I looked, I noticed the alternator was spinning very slowly. There was no noise or burning smell, so I continued working for a while longer. I had another look when I finished, and by then it had stopped spinning altogether. Again, no noises or smells. I had no time since to have a look, but would anyone have any idea what it might be? I’d assume a failing bearing would make a noise? The tractor is used regularly, so I don’t think it’s seized from lack of use.

minerleague

https://www.boards.ie/discussion/2058251570/alternator-not-spinning

Is the fan belt loose?

Gant21

https://www.boards.ie/discussion/comment/119244498#Comment_119244498

It’s probably reddened of it. He would bend a crow bar in a bog.

hopeso

https://www.boards.ie/discussion/comment/119244498#Comment_119244498

No, it's fine. The alternator pulley is on a straight section of belt, in between two other pulleys. There isn't huge pressure on the alternator pulley, but plenty to drive it..

cjpm

Sounds like a bearing gone in the alternator. Either that or you left the immersion on 😂

hopeso

I had a look just now after I got home…. It turns out that the pulley is actually spinning, or at least part of it is. Looking at it, you would say the pulley isn’t spinning because the centre of it isn’t, but the outside part that the belt travels on is spinning freely….so it looks like a new pulley is what’s needed…