SOS fluids, coupler and maintenance walk through

Today I'm spending maintenance and explore time on this 59 - 871.

Changing SOS fluid with 134 equivalent. While i have the filler plug out and the drain open, is there any advantage to flushing the case out? And what would be best? Diesel? I don't want to damage the glyptol coating.

2. I have the traction coupler inspection plate off. I see that the lever fits in a sliding coupler. It wont move by hand (the coupler on the shaft), but the coupler is forward on the splined shaft. I?m assuming that is in the engaged position. Correct?

Should i attempt to slide the coupler back and then fit the plate and lever? Or, just fit it while it is in the forward position? My wheel and fender is on. Best to remove them? It appears that the lever was not connected at all. It was loose in both positions.

3. Rear case fluid is rusty brown. Best to drain and replace now? Do I use same hydraulic oil as in tranny case?
 
The coupler can become bound in the splines if it slides a bit too far - strategic levering will loosen - once loose it will slide very easily, so be careful not to let it 'slam' to a stop or it will likely become bound on the other end. I think this is one reason that the lever mechanism becomes disengaged. I replace the cover with the coupler in the engaged position, but I don't know why it wouldn't work the other way.

If it were mine, I'd definitely change the oils in all the reservoirs - as Dean suggested, contaminated reservoirs will benefit from a double change - in the SOS, I wouldn't use any oil but that which meets 134 standards - in the other two reservoirs I wouldn't be scared to use cheap(er) oil for the first change. There is heated debate here about what oil is appropriate for the rear end and hydraulics. I'd guess most modern oils will work just fine, particularly given the use most of these older tractors see. For me, in the SOS, I buy 134 fluid from NH. Trying to save $35 on oil for an expensive transmission looks like a fools economy from here.

I use kerosene and a hand pump sprayer to flush the areas, hosing down all the surfaces I can access and agitating the sludge at the bottom. If you have the luxury of taking your time, you can let the fluid settle and reuse most of it until things are as clean as is reasonable. Diesel would work just fine, I'm sure.
 
We don?t have a NH here. Not close. Tractor
Supply has an equivalent. Think i will try to find a
new filter and run this unit with the TSC brand, and
then change the fluids again after 10 hours or so. I
think I used a Valvoline product once but don't know
right now what it was.

Thank you.
 
Just be absolutely sure the fluid you get meets the Ford 134 specification. The 2 fluids offered currently by CNH for this, is the 134 Multi-G and what supersedes it, Ambra Master Tran. Pricey, but there were always equivalents out there, best you verify before you purchase.

Use the wrong fluid in one of these, it will fail in short order. I experienced this almost 40 years ago, someone decided to change the oil in the S-O-S transmission, they replaced it with the incorrect fluid and the tractor stopped moving right when I was in the middle of a show, in one of the show rings, had to be towed out.
 
Thanks for posting this. I checked the fluid after reading this, and the label indicates Ford NewHolland 134D and M2C41 along with other cross references. Costs about 13.00 a gallon.
 

That's junk 303 oil.
Read the label again, it probably says it recommended for 134 but doesn't say it meets 134 spec.

Some may argue but if you have a John Deere dealer near by get their Hy-Gard hyd oil
Case Hy-Tran, Kubota UTD are both good oils.

Don't put cheap junk in a SOS trans.
 
So...i don't have a CNH nearby. NAPA sells
Navigaurd hydraulic oil that cross references the
M2C41 and 134d specs.

Anyone ys Navigaurd from NAPA?

Price same.... 50.oo per 5 gallons.
 

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