4000 sos tranny problems

Nickmicco

New User
All i really know is its a 65+ 3cyl diesel 4000 with the sos trans. I was brush hogging the feilds the other day and the tractor just stopped the pto doesnt spin or anything. I dont expect someone to be able to tell me exactly whats wrong just hopefully point me in the right direction i dont really know much about tractors but in trying to learn.
Thanks in advance.
 
The guys here probably CAN tell you exactly
what's wrong.
If you have nothing - no movement in any
gear and no pto it is most likely it
grenaded either the input shaft into the
transmission, the torque limiter clutch
which drives the input shaft or both.
It is not uncommon on those.
Repairing it is not real hard but does
require splitting the tractor between the
engine and transmission - all of which is
pretty straight forward. There is one
special precaution you must follow and that
is after you split it you must stand the
transmission/rear end up so it is pointing
straight up in the air otherwise there is a
thrust washer that will fall out of place
when you pull the input shaft. If that
happens I think you are in for a major
disassembly of the transmission.
Here is the kicker though. New parts are
available only from your New Holland dealer
and horribly expensive. And used parts are
likely to be mostly worn out - and
expensive.
It's sad as your situation has been the
demise for many great tractors because they
were just too expensive to repair.
I am not an expert on those mind you and
others here will soon be along to confirm -
or correct - this info.
 

Dog has diagnosed your problem correctly.

However, I would not say splitting your tractor is fairly straight forward. There are some things about disconnecting your PTO and shifter control cables that are pretty specific and must be followed to a T. Those have been described on this forum previously. You'll either need to search them out or get a service manual for your tractor before proceeding or you may have worse problems than you now have.
 

You can get the shaft re-splined at a machine shop and put a new torque limiter clutch disc in it.
 
There is a group on Facebook called "Ford Select o Speed" (you can find them with the search feature in FB). I made contact with a gentleman in the
UK that has provided me many parts for my 5000 SOS. Post your problem there and you will find additional help and resources. Some things you just
can't get get from Ford-NH and if you do they are terribly expensive.
 
Hook up a pressure gauge to one of the bands and check for pressure in neutral. If you have little or no pressure, your pump is not turning
because of stripped input shaft splines - that's pretty much a guarantee. If you have good pressure, post back and I'll speculate from there.
 
If the problem is a stripped input shaft, the tractor will only need to be split behind the engine, and the shift cables will not need to be
disturbed.
 
(quoted from post at 09:32:44 05/27/18) If the problem is a stripped input shaft, the tractor will only need to be split behind the engine, and the shift cables will not need to be
disturbed.

How ya gonna do that, Bern . . . unless removal of the hood is different than the earlier models and doesn't involve removing or loosening at least the PTO cable????
 
I'd also want the steering column removed were I going to work on an input shaft. You can't do that without disconnecting or removing cables. With the heavy splines on the later SOS, I'd bet more on TLC problems than input shaft problems. In that case shifter cables need not be disturbed, but PTO cable would need some manipulation.
 
This is a '65-up tractor here Larry, not a pre-'65. I fear you may be confused on that point. A post-'65 tractor does not need to have the
rear hood (a.k.a. fuel tank cover) removed to split the tractor behind the engine. Consequently, no disturbing of the shift cables is needed
or necessary.
 
If I had to replace only the input shaft on a SOS transmission, I most certainly would not mess with the steering box or the shift cables.
I'd split the tractor behind the engine and stand the tranny/rear axle straight up in the air and go to work. I don't know what removing the
steering box is going to do for you. It would be a pure waste of time for me.

Also, why would the PTO cable need "manipulation" if only the TLC is being replaced?
 
(quoted from post at 18:08:41 05/27/18) This is a '65-up tractor here Larry, not a pre-'65. I fear you may be confused on that point. A post-'65 tractor does not need to have the
rear hood (a.k.a. fuel tank cover) removed to split the tractor behind the engine. Consequently, no disturbing of the shift cables is needed
or necessary.

No, Bern. You're incorrect. I know this is a post '65. And if you read all my responses here, you would note that I indicated the later tractors may be different.

If I was to stand a tractor on its tail, I'd want the steering gear and all that assembly out of my way. Your tastes may be, and likely are, different on this point.
 
The picture above is not from me - I believe it came from someone else on this board. As you can clearly see, the steering box is not in the
way.

My advice to anyone who has to replace an input shaft is to leave the steering box and cables alone, because it adds a level of complexity to
the job that is clearly not necessary.
a268892.jpg
 
I reread this thread this morning and was
thinking about this.
I think Bern is correct that you would not
have to mess with the shift cables.
Just leave the cowel and steering box in
place and you'd be good to go.
Another thought I had is we probably have a
useable input shaft and TLC for that
tractor. It's in a transmission that came
out of a 4400. The tranny failed for other
reasons but those parts were still useable
so we saved the whole thing.
Nickmicco, If you were interested in them I
could look them over closer when I go back
up to my property in a couple of weeks. Get
some pictures fir you, etc.
My email should be open.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top