155D Generator bearing burnt and froze

G

goldchaser

Member
Hi all, was getting ready to haul my sprayer around the place and started smelling rubber and noticed smoke from under the hood of the tractor. Popped the hood and saw the fan wasnt turning and the belt smoking up a storm. Stopped the engine immediately and checked things out and found the bearing in the pulley was apparently frozen. And then learned something that I hadnt known. The pully is also the generator for this tractor. I thoughT it was strictly for the fan...my bad!! :pat: I know I havent had this thing for too long, and when I repaired it and got it running in the first place I just never noticed the dang generator. I should have...but the parts that I had to fix and repair hadnt involved it. :shitHitsFan: Made me look pretty dumb. Anyway, I pulled it today and am waiting on a new bearing I ordered from Hoye Tractor and disassembled the generator. Its a simple one, for sure. Meant to add a photo of the bearing but the battery on my camera is dead at the moment. Its burnt pretty good.

My question is how do I get the bearing out of the housing. I pulled the main coil out with a puller with no problem but the bearing stayed down in the housing and there isnt any way to get the puller around it Will post some photos tomorrow soon as I get a new battery in the camera. but in the meantime, if anyone is familiar with the generator assmebly and has any suggestions as to removal of that bearing, I would appreciate it.

I know it shouldnt be hard, but I just dont see a way to pull the thing with down in that housing. I dont want to pry the thing. Hmmm...the main pole/bolt is still in the housing with the pulley attached to it. Is it possible to press that bolt out? I didnt want to just try it until I checked with someone in case I damaged something. But it seems like if I press that bolt it should push out with the pulley, leaving the housing and the old bearing behind. Not quite sure how to do it as yet, the housing doesnt have any squared sides to allow the prongs of the puller to hook to. Any ideas from anyone. California...your tractor is almost the same as mine, have you worked on your generator before? :respect:
 
Sorry, no relevant experience here. I replaced the alt and reg on mine but the larger Yanmars used conventional automotive stuff - 72 Datsun in my case.

I would take that to an auto electric place. I think that's a project for a specialist because there's no cheap fallback if it gets messed up. If I understand, you are saying the bushing is in the bottom of a blind hole. (???) Maybe they will get a grip on that bushing by tapping threads into it???
 
Hi CA, glad you could chime in.

California said:
Sorry, no relevant experience here. I replaced the alt and reg on mine but the larger Yanmars used conventional automotive stuff - 72 Datsun in my case.
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Well, I made a little mistake, what I have IS an alternator, rather than a generator. However, it has two identical bearings in the housing. The one closest to the pulley is the one that burnt out. As you will see in the photos I am including now.

California said:
I would take that to an auto electric place. I think that's a project for a specialist because there's no cheap fallback if it gets messed up. If I understand, you are saying the bushing is in the bottom of a blind hole. (???) Maybe they will get a grip on that bushing by tapping threads into it???
Click to expand...

Actually, it was the bearing itself that was down in the magnetic housing of the alternator. I ended up getting it out by tapping on the shaft with a wood hammer and tapping the shaft out.

What you see in the photos is after I have already tapped the shaft out. The first photo shows basically how the bearing was sitting down in the houseing though I have actually removed it. The second and third show the housing and center shaft and then the housing and pulley. The last photo shows what is left of the bearing. The ball bearings are melted pretty good and the outer seal has ....well...gone. Going to have to clean this up pretty good before I put it back together. Lots of carbon to be removed.
 

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Goldchaser,

What you have is actually a magneto. They are tenacious and very durable, but the bearing only last about 30 years :D.

The bearings should be pressed out and pressed in during reassembly. Your local auto parts stores (that have a machine shop) should charge you the minimum…but I would make two trips so that you can clean and de-burr the shaft before the new bearing(s) and bell are pressed on.

Here’s a little parts diagram just for reference.

Mark
 

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Mark777 said:
Goldchaser,

What you have is actually a magneto. They are tenacious and very durable, but the bearing only last about 30 years :D.
Click to expand...

Well dang....that means it should have lasted at least another year or two.:pat:

Hell at this point you could tell me it was a plasma engine and I wouldnt know the dang difference. :wink:

Mark777 said:
The bearings should be pressed out and pressed in during reassembly. Your local auto parts stores (that have a machine shop) should charge you the minimum…but I would make two trips so that you can clean and de-burr the shaft before the new bearing(s) and bell are pressed on.
Click to expand...

Well, I think I can get the other bearing out without any major difficulty and that way I can get things all cleaned up and then make the trip into town...well...gonna have to be Monday since I will have another bearing then and I can just replace both rather than take a chance on the other one going out in a short or long time down the road.

Mark777 said:
Here’s a little parts diagram just for reference.

Mark
Click to expand...

Thanks Mark. It came in handy. Sitting looking at it right now. The diagram and the altenator/generator/magneto/plasma/fusion drive, whatever.:yum:
With it being down a few days, aint bad really. Could have been alot worse. A new unit would cost me 300 bucks so being able to replace just the bearings is alot cheaper.
 
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