Noise in my SOS

I have a "65 5000 SOS that will make a "low pitched whine"(?) when it gets up to operating temp and the RPMs are up for an extended time like cutting/baling hay. Doesn"t sound like anything is grinding or anything like that. Shifting gears doesn"t change the pitch or stop it. If I slow the engine the sound immediately goes away...increase the RPMs and after a few minutes, it comes back. There isn"t any loss of power or performance anywhere that is perceptible to me. Fluid levels are fine all around. Where do I start looking, or is this something peculiar with the SOS?
 
from 700 miles away, I'm guessing it's a normal noise. Any hydraulic system, which is a large part of what the SOS is, is apt to have some whine or buzz to it.
 
Is this a fairly new development or has the whine always been there?? If its started recently you might check the pick up screen and or filter. Could be the Hyd. Pump is starving slightly.
 
I wouldn't worry too much about it, seems like these like to whine some as Larry said. I grew up using a 65 5000 also and I always remember it doing that. It finally started to give trouble with low oil pressure after the the 3rd hourmeter that I can remember had around 7000 hrs on it and the 1st two gave up with at least that many hrs so I know the tractor had over 20,000 hrs on it and it was worked hard and had a m&w turbo put on it. Loved that tractor and really cussed the replacment, Dad bought 74 5000 with the 8speed. He balked at the idea of spending that much on the tranny and of coarse the engine needed an overhaul too. Just my 2 cents worth GReg NE
 
Hello Hunter , Sounds to me as if the Main Shaft bearings are going south , a common problem when 5000's with SOS's get high hours on them . There are three bearings on the main shaft when they get REAL BAD they will take out the oil pump then of course the rest of the trans will be full of metal from the destruction . Time to fix it is NOW before it gets to the destruction stage because it will double the cost when it blows . I have done a few 5000's both before and after so I have seen the mess first hand. Thanks Tony
 
My thought was also the input shaft based on the description... but I guess that would depend on how bad the noise is or one's perception of it. The description of the problem initially does suggest input tho.

Rod
 
Tony, you jogged my memory alittle with your post and now I remember Dad had those replaced once a long time ago when I was a kid. It also might explain the low preasure in it now as it got alot of use after and had the clutch packs replaced too. I still have that tractor and dream of fixing it up again someday when the funds allow. That tractor could sure pull a 4-14 plow, only problem was traction even with fluid and 3 weights on each side. It sure would put a buddy of mine and his 656 farmall to shame at a plow day. ;^) Greg NE
 
Hello Greg , I am sure your Dad had them done a couple of times if you guys had upwards of 20,000 hours on it unless he replaced the trans. at one time . I also run an extra gallon or so of oil in them so the splash is heavier and lubes them better . I run extra oil in all of my SOS's too the 801/4000's will cavitate on a steep side hill when I was pulling logs with them finally stopped it with an extra gallon in them . Thanks Tony
 
Hello Rod , The problem now is if you let them go to long and it destroys to much it gets way to expensive to fix them because the parts are getting harder to find , bearings are pricey enough never mind wiping out the pump and shafts too. Thanks Tony
 
Tony, where do you put the extra oil in at on a 5000, no cover to pore it in? I haven't looked at this tractor in a long time but only remember the pain in the butt level plug on the side like my 63 4000 and 59 971. I just wish I knew 1/8th as much about these trannys as you do as I really like them. Picked up my 971 this summer from an older farmer that parked it when it quit moving, sure enough it was the imput shaft splines and thanks to the folks like you on this board I knew about the trick to stand the rearend on end to keep washer from falling out. Was out tooling around with it about three hours later the same day and it works great. I did make me up an adapter to run tranny with a drill first to check the oil preasures at the three ports to see if it was worth taking a chance on. Didn't need another tractor but you know how that goes, price was right and wanted to save another sos. thanks Greg NE
 
Greg NE
That sounds like a neat trick to run the tranny with a drill for testing.
That is good to know as I may have a n SOS land here yet.
Brian
 
Larry NCKS
Too late, I have operated them quite a bit, I like them.
My apologies to the poster for jumping in on his thread!
BTW the SOS tractors I have operated did have different noises as they operated. One 3000 has about 14,000 hours, they have regular maintenance and the owner is very satisfied with them.
1- 5000 & 3 - 3000 series all early to mid 70's.
Brian
 

Question for you about the "noise" that you're hearing, I also have a noise that appears (5000 w/SOS) only under a load and only if the RPM's are over 1600.....they best way I can describe it, is it sounds like you just hooked a huge salmon and it's taking line off of your reel. If I drop my throttle down to low idle it will go away or if I never go into/above that RPM it doesn't appear. Sound like the same problem :?:

Dave
 

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