Farmall 300 independent pto, broken drive gears, help

rjfcsa

New User
Hello All,

Been a while since I have posted here but I have some questions and looking for advice. I am helping my brother-in-law with his farmall 300. His brother was using it, I need to re-check what the was doing, but I think he was mowing with it. Well something happened and said it was making a terrible noise and the Independent pto quit and it sounded bad just to drive it. He said he pulled one of the covers and a bunch of teeth came out?


Well finally had time to look at for myself, for I had an idea where the problem was but I still don't know what caused it. We got it split apart the other night. we have the clutch t.a. hosing separate from the front and rear ends. The I.P.T.O. drive and shaft had about all the teeth sheared or ground off , as well as the driven gear that it meshes with. The upper bearings feel nice and smooth The lower driven gear and shaft is still in, I have find a big 8 or 12 point socket to get that big stupid pipe plug out, anyway it spins nice ever so slight front to rear of back and forth movement on shaft. I can grab the lower shaft on the front of the transmission and it spins snugish but not hard as I would kind of think it would. I did not engage the p.t.o. leaver though to see how it felt then.
I guess I am wondering before I just put new or good used parts it, have to find them first, what would have caused this why did it fail? I thought bearing failure but can see no failed bearings. The splines in the pressure plate and very very thin, it heeds a new pressure plate, and I would have thought that would have sheared those worn out splines. My only idea was if he hit something mowing and it happened to have a bad tooth, and that broken tooth led to more broken teeth? My brother-in-law said the oil was rather milky and had water in it, said he had to poke out some ice before the oil ran out. By the way this broke in mowing weather so ice is not the issue. I do not think that a real issue to failure as the T.A. still worked and the bearings still feel good.
Well any advise would be helpful, as I still don't know why they broke.
Thanks,
Russel Foster
in Illinois
 
Maybe hit something with the mower that started teeth breaking then momentum of the mower stripped more teeth. Or one tooth broke and wedged the gears.
With pto engaged the pto shaft at the transmission front should turn without much drag.
If that seems okay and the pto turns smooth you could change the oil in it to check for any metal.
You will need to remove the retaining ring lower pto shaft in center housing at rear bearing. Get the plug out and see if the bolt and washer holding the gear to shaft is still intact and tight. Remove the bolt and drive shaft out the rear. Best to wedge the pto gear to front on each side before driving out to keep pressure off the shaft front needle bearing.
12 point socket will work on the plug. Think its 1-5/8 but could be mistaken on the size.
 
Your saying the gear that run off the back of the pressure plate is stripped? There is a lot of wear there on the ones i have taken apart, I got a few laying around home with 80% of the splines gone from normal wear !!!
 
(quoted from post at 13:40:01 02/26/15) Your saying the gear that run off the back of the pressure plate is stripped? There is a lot of wear there on the ones i have taken apart, I got a few laying around home with 80% of the splines gone from normal wear !!!

Yes, but not the splines the beveled gear end has all the teeth broken. The splines are not terrible but the splines in the pressure plate are really thin.
 
(quoted from post at 12:34:52 02/26/15) Maybe hit something with the mower that started teeth breaking then momentum of the mower stripped more teeth. Or one tooth broke and wedged the gears.
With pto engaged the pto shaft at the transmission front should turn without much drag.
If that seems okay and the pto turns smooth you could change the oil in it to check for any metal.
You will need to remove the retaining ring lower pto shaft in center housing at rear bearing. Get the plug out and see if the bolt and washer holding the gear to shaft is still intact and tight. Remove the bolt and drive shaft out the rear. Best to wedge the pto gear to front on each side before driving out to keep pressure off the shaft front needle bearing.
12 point socket will work on the plug. Think its 1-5/8 but could be mistaken on the size.

Thanks for the input, should be easy to get the shaft out with the whole clutch housing sitting there by its self. I did not have a big enough 12 point socket with me when I was up at his house so when I go back I see if we can get the plug out.
Also is it very normal for these not to have a seasonal disconnect? this one just has a coupler there with a roll pin in one end.
Thanks,
Russel
 
Farmall 300 serial number 24837 and higher used the coupling as standard equipment. Some got replaced with the coupling if the disconnect parts failed.
 

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