New member-Transmisson filling questions

Hello,





My name is Tom and I am new to this forum. I am trying to do a fairly decent resto. on my 1951 Case SC tractor. I have a
question I'd like to verify because the pictures in the copies of the owners and service manuals I bought aren't that clear. I
want to change the transmission fluid. Lord knows the last time it was changed!! Anyways, Question #1...In the one picture that
has the two drain plugs-- It's the larger one that is the fill hole for the tranny? Question #2 In the picture with the blue
tape and arrow- that little plug is the "fill level" for the trans fluid? (once fluid starts to come out that, that indicates the
proper amount of fluid(similar to changing the oil). Question #3 The picture with that large plug at the bottom of the tractor-
that is the drain plug for the transmission? The one manual indicated two plugs, but I believe that was for a different model
tractor. Any tips on draining it? I know its gear oil but should I expect it to come shooting out of there due to the volume of
fluid? The manual says it take about 9 gallons of 90 weight oil- if I can't find 90 weight, any reccommendations for a good
substitute?? Thank you for any advice. Tom

You do have it all figured out. The DC's also have a smaller drain plug back under the rear end that seems to be a better place to drain the condensation out in the winter. 80-90 in Northern US. 85-140 Southern, or if not used in winter.

If you do not use it a lot, be sure you drain the condensation out of the bottom plug in the fall after it has set over night. Water will be at the bottom of all that casting, it is heaver than even 85-140 rear end oil. All that cast iron tends to draw a lot of moisture as temperatures change & the rear end is vented.

It probably won't come shooting out unless its diluted with water which would come out first. It'll probably look more like thick molasses for quite a while during draining, at least all of mine did the first time I changed it.

Thanks, I don't use it alot. I only use it to launch my boat at the end of the street. I've had it 15 years and never changed it. I'm sure some of you are cringing with that statement. I just never knew.

I'm sure there are a lot of old tractors that still have most of the original oil in the transmission. Most of the ones I have drained looked like it anyway

I have never had the courage to unscrew that Transmisson plug to drain off the water! That is tricky getting that plug back in.
Maybe someone could tell me how they do it......successfully?

The worst trick is dropping the plug when you only want a small amount out.

I think the water will come out before the threads totally separate. I think.