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Gear oil revisted, Bob M others

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Paul Shuler

08-30-2007 16:02:36

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There was a discussion a few days ago about gear oil in old Farmalls. It talked about GL-1 through GL-5 90w oil. In my ignorance I didn't even know there was different grades of 90w. This morning I went out to look at the bucket of gear oil I used to top off my H when I changed the pto seal. I Added about two gallons. It said rated GL-5 through GL-3. In the previous discussion it came out that some felt the GL-5 stuff was over kill for old tractors and that it may even be harmful to brass bushings. If this is the case do I need to drain and flush my rearend{on the tractor}. Oil is high now but would be cheaper than a rebuild if it screws something up. Tractor is used 15 to 20 hours a month mowing. All opinions welcomed. Thanks
Paul

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Bob M

08-31-2007 07:16:52

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Re: Gear oil revisted, Bob M others in reply to Paul Shuler, 08-30-2007 16:02:36

Hi Paul - I agree with dcw (below). For your H as long you used grade of oil, it's GL classification probably doesn't really matter.

And even if the GL 3 - 5 DOES cause corrosion or wear on certain parts (which isn't certain...), it'll take place much slower than it did with the original mixture of oil, water and whatever else you drained out of the rear end before.

I wouldn't be concerned!

Bob

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dcw

08-31-2007 01:56:56

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Re: Gear oil revisted, Bob M others in reply to Paul Shuler, 08-30-2007 16:02:36

As long as you use a good grade of gear oil,the classification doesn't matter much.Lets face it,these transmissions and differentials don't turn up all that fast,and considering the gunk I've drained out of most of my tractors when I get them,(including water,and lots of it),any fresh gear oil would be an improvement.

Gear oil considerations become important in truck transmissions,considering the speeds and loads,and changing temps and climates.

Also consider the changes in oils from when these tractors(letter series)were new.

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John in Ct

08-30-2007 19:02:02

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Re: Gear oil revisted, Bob M others in reply to Paul Shuler, 08-30-2007 16:02:36

I posted this in the previous thread but no one replied. I was wondering, is the IH brand 85W140 ok to use in an H trans?

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Steven f/AZ

08-31-2007 07:51:37

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Re: Gear oil revisted, Bob M others in reply to John in Ct, 08-30-2007 19:02:02

I have had the CIH 85w-140 in my H for about 300 hours now with no problems whatsoever. It"s what I prefer to use since my tractor gets used year-round and gets tough shifting in the winter with the SAE 90 in it.

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Paul Shuler

08-30-2007 19:14:06

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Re: Gear oil revisted, Bob M others in reply to John in Ct, 08-30-2007 19:02:02

John I have that in a Super C I went through about 8 years ago and it has done fine. I couldn't tell you what the GL rating was. My super C does not see a lot of work but the rear end is very quite on it.

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Bob Kerr

08-30-2007 17:42:48

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Re: Gear oil revisted, Bob M others in reply to Paul Shuler, 08-30-2007 16:02:36

Someone stop me if I am wrong, but I think there is only 3 bronze bushings in the entire rear end. 2 on the reverse idler gear and one in the end of the lower trans shaft for the PTO. There are two bushings for the brake band pivots, but they are sealed off from the rear end. I would have to say the High GL rating is most likely shear additives for high load applications and I think they use sulpher for that. If you let water get in the rear end from sitting outside or washing the tractor a lot, it could cause sulphuric acid to form and eat the bronze. My H manual does say to change the gear oil once a year. When they were new, some gear oils acually had lead in them for high friction protection. Lead is one of the best friction additives there is, but the gov had their way with that way before the EPA existed. I do know where about 20, 1 gallon square metal cans of that old stuff with the lead is sitting, but you have to buy the ring and pinion/differential assemblys to get them and they fit early-mid 50s buicks.

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NDS

08-30-2007 17:42:07

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Re: Gear oil revisted, Bob M others in reply to Paul Shuler, 08-30-2007 16:02:36

You will get all kinds of opinions but we started using the multi purpose gear lube in letter series tractors at least 40 years ago and 3 of the letter series and a 400 (no TA) are still around and if it has harmed anything it has not shown up yet. Did have a pilot shaft bearing go out on Super M couple years ago but there was no "Yellow Metal" in that.

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