JD B transmission oil and how to flush

Howdy everyone! Ive got a 41 JD B that the oil in the transmission, axles, rearend has turned gunky and needs to be changed and flushed. The tractor is solely for putting around but this nasty yellow goo is bothering me. It seeps out of the axle seals after driving for a little while. I was told by a local that water has gotten into it somehow and made the oil bad. It stays under cover so I dont know if his theory was true. Needless to say I want to clean it out and put fresh oil in there.
What type of oil is best to use and approximately how much will I need?
Can I flush the rear out with something?? diesel maybe? I dont want to flush it several times with good oil if I can avoid it.

Thanks for reading and replying,
Caleb

I belive if it was me, I would jack both rear wheels off the ground, drain all the oil out, and fill it with diesel, start it up, put it in gear and let it run for a little while, before draining it again. I imagine that 80-90 is what you finish with.

Either kerosene or diesel will do a good job of flushing after you drain out the goo. That was the standard treatment when those tractors were nearly new. JD dealer would come out and do it if you wanted. Several oil companies also did it, or, you could do it yourself. They told us to drive it a little with the kerosene in it (100 feet or so).

Checked the Service Manual SM2004 on page 30-5-8 [b:654c4848f0]Tractor, Model "B"-Lubrication[/b:654c4848f0].

[b:654c4848f0][i:654c4848f0]21. TRANSMISSION DRAIN AND FLUSH (All "B" Tractors).

Drain and flush transmission at least once yearly. To do a thorough job of draining, remove both transmission and rear axle drain plugs.

To flush case, after draining out old oil, replace plugs, add 3 gallons of flushing oil. Then jack up one rear wheel, start the engine, shift into gear, and engage clutch. Run for a few minutes, then drain the flushing oil. When draining the flushing oil, do a thorough job and remove both the transmission and rear axle drain plugs. Replace plugs after transmission case is thoroughly drained.

22. TRANSMISSION FILL (All "B" Tractors).

Fill the transmission through the plug on the right side and slightly forward of the power shaft. Total capacity is 4-1/2 U.S. gallons. When selecting the correct weight oil to put in the transmission, refer to the temperature-weight chart.

If the tractor owner changes transmission oil only once a year, the S.A.E. 140 oil used for Summer operation may be diluted for cold weather operation as follows: To 3-1/2 gallons of S.A.E. 140 oil add 1 gallon of distillate. This dilution is for limited cold weather operation only. Instruct the tractor owner of steps you have taken and caution him to replace the diluted mixture with S.A.E. 140 oil in the following Spring.[/i:654c4848f0][/b:654c4848f0]

The photo below shows the transmission drain plug.

<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/John%20Deere%20Equipment/43B/Lubrication/IMG_3501_zpsde50e1d3.jpg.html" target="_blank"> </a>



The photo below shows the rear axle drain plug.

<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/John%20Deere%20Equipment/43B/Lubrication/IMG_3504_zps2b442fc4.jpg.html" target="_blank"></a>



The photo shows the fill plug.

<a href="http://s200.beta.photobucket.com/user/jameslloydhowell/media/John%20Deere%20Equipment/43B/Lubrication/IMG_3113.jpg.html" target="_blank"></a>



Hope this helps.

Thanks James for the great reply! How are you and Miss Nancy doing up in the land of north Texas? I haven"t been on this site in a long long time. I guess I"m gonna get to flushing this transmission in the next few days. Tractor is headed to the Rio Grande Valley since my family and I are moving to Lubbock for my new career. I really appreciate the quick replies and experiences.

Gig em and God bless,
Caleb