Going to look at a 981 with the SOS next weekend. Always had 4 or 5 speeds. Know nothing about the SOS's except what I've picked up on here. Is there anything I really need to take a close look at when test driving it? Pro's? Cons? Seller tells me it was switched to a 2nd. generation SOS years ago by a Ford dealer. What is the tell tale difference from the 1st. generation so I can be sure? Thanks!
- Thread starter Tom Bond
- Start date
Larry NCKS
Well-known Member
Generally most 1st gen SOS transmission have the raised cast number 312259 on the left side about where one's left heal would be when sitting in the seat.
2nd gen units would have either a C0NN-7006-B or a C3NN-7006-B cast in that same location.
Get the rascal to operating temperature. Make sure it functions well in all ratios both pre-op temp and post.
Larry NCKS
Well-known Member
I should add, In my mind there are no cons. This unit will have an independent PTO and a transmission speed ratio for about any operation you wish. If the replacement transmission is identical to the original in PTO option, you'll have a ground speed PTO option as well as a choice of 540 or 1000 RPM PTO. It is also a full powershift transmission and will definitely make the tractor travel faster in road gear than a 5 speed and likely than the 4.
Bern
Well-known Member
- Location
- Mount Vernon, WA
Larry is correct. Operate the thing until the case is hot, then make sure each shift is firm and crisp at lower engine speeds, say, half throttle.
steve in wi
Member
Not to high jack his thread but I have a ford 5000 which I believe is a early 1968 model with the sos,would this model be considered 2nd generation? Buy the way I love this tractor for cutting hay,baling it is the cats meow with a 315 hooked up two it,you can find a perfect mph within a few gears. steve
Larry NCKS
Well-known Member
No! 2nd gen applies to tractors built prior to '65. Yours is at least 3rd gen. Tell me if it's a C5NN or C7NN.
Ultradog MN
Well-known Member
- Location
- Twin Cities
No SOS expert here but I think the 65 and newer tractors were at least 3rd generation.
First gen was the very early ones that would freewheel while you were going down hill.
These had a lot of problems and many, if not most of them were replaced by 2nd gen transmissions - I think free of charge - by Ford. Those were used through early 65 when the new line of tractors came out.
I think by 65 they had the bugs worked out of them and many, if not most of those are still running today.
First gen was the very early ones that would freewheel while you were going down hill.
These had a lot of problems and many, if not most of them were replaced by 2nd gen transmissions - I think free of charge - by Ford. Those were used through early 65 when the new line of tractors came out.
I think by 65 they had the bugs worked out of them and many, if not most of those are still running today.
Went to look at tractor. Can anyone tell me what these casting #'s go to. It looks like the trans number is first generation. It there anyway to tell if the trans was reworked to eliminate all the original issues with it? Seemed to shift well into all gears. Wow...The road gear is quick. Both reverse worked and went into park no problem. PTO cable would not budge. PO said it worked when he got it but he tightened a nut behind handle and it hasn't moved since. PTO does spin when running but can stop with hand. There is no Model # or serial # except for the one the current owner stamped on it by starter to match a # found by the hydraulic pump. I think you can make them out in the pics. Tires about 50% with tubes and has hydraulic block and 2 hoses. Everything else looked fair. Sheet metal good. Needs battery.
showcrop
Well-known Member
Well, that is a puzzle that you have there. No serial number means that it was changed out. My 971 has no serial number but it has the second gen. housing and does not free wheel. The cover on this one appears to be a first gen cover, so if it does not free wheel in any gear it must have been a very early one that got reworked, but in a first gen housing from the factory. The tractor apparently got a quickie paint job a few years back and has sat outside since then. The PTO control being stuck is probably better than if it moved and nothing happened.
I too have a 1968 5000 with SOS. I bought it from a guy there in Johnson Creek years ago and I still use it to bale hay. I cannot think of a better tractor for doing so since it's so easy to change speeds depending on conditions.
I moved from Wisconsin to here in western Colorado 5 years ago, hauled the tractor out here and I am happy I did.
Sean in PA
Well-known Member
That's for the ground speed PTO drive. Front lever is for 540-N-1000 RPM PTO speeds. There is an internal interlock so that the front lever needs to be in Neutral in order for the rear lever for the ground speed PTO drive to be able to be switched to On. Likewise, the ground speed handle needs to be in the Off position to be able to switch the front lever out of Neutral into either of the 540 or 1000 RPM positions. The handle on the dash controls the actual engagement PTO once the front lever is in either the 540 or 1000 RPM position. Once the ground speed PTO drive is in the On position the handle on the dash won't do anything, the PTO will just turn whenever the tractor is moving.
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