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Farmall 100 transmission leaks????????????????????

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Patrick Martin

12-12-2006 10:08:30




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Hey guys, quick question.

Are there an overflow ports in the transmission????

I drained my tranny, ran some diesel in it and flushed it out and refilled it with with IH HyTran and I noticed it's leaking out through two ports under the rear axle housing. (see pic)

Now I'm just itching for an excuse to tear into the rear axle and final drives but I'd rather it be for a worthy cause. I know there are two seals in there that could possibly leak. Are these ports for determining this?

If they are just overfill ports then oh well.
Sorry if I can't reply but I will ASAP. I'm working out of town and haven't access to my company email as of yet.

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gene bender

12-13-2006 03:29:43




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 10:08:30  
Your supposed to use 90wt gear oil. I would try that first but the seals are probably bad.



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Haas

12-12-2006 19:26:49




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 10:08:30  
If you put more than 5 quarts in the transmission, it is over filled. Level plug is behind brake rod at front of transmission on left hand side. You have to take the pin out of the brake rod clevis to get to it. Those are not overfill ports. But as the others said, but are drain holes to let out any transmission oil that leaks past the differential shaft seal into the brake chamber. If oil gets on the brake linings, you will have very little in the way of brakes soon. Even if the differential shaft seals are in decent condition, if the transmission is overfilled, you are likely to get leakage. The seals are not too hard to replace, but you do have to remove the final drives housings to do it. That and the wheels, especially the right side cast hub are heavy. So be careful and if you decide to do it, do one side at a time, and block up securely. The tractor is not very stable due to the offset design, especially when the heavy cast wheel on the right side is removed. Removing the cast wheel hub takes away the counter balance.

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Hugh MacKay

12-12-2006 15:10:37




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 10:08:30  
Patrick: Two or three of the guys touched on your possible problem. As Jay suggested you may have some diesel in there. I drained my 140 about a month ago and found by jacking front end a foot off the floor more gear oil came. With the diesel in there and filling with hy tran, you probably have a very thin solution in there by now. Then if you over filled, it"s bound to leak even with decent seals.

I"ve seen these tractors leak back when new, even with gear oil if overfilled too much. Probably 2-3 qts too much. The fill to level plug is just below front tip of left fender, behind the brake pull rod. The holes you are pointing out are not overflow for transmission, just purely a drain for any oil that does leak past seals.

My advice, drain the transmission, jack front end of tractor, so it all comes out. Leave it jacked and draining 24 hours which you should have done in the first place. Use your diesel fuel for it"s intended purpose, and DON"T flush the damn transmission with anything, anytime, ever. I"ve drained a good many tractor transmissions that looked anywhere from cows milk to rust colored paint, never flushed one yet. Fill it with 90+ W gear oil and fill only to the fill to level plug, good chance it will stop leaking.

If you look at that fill to level plug, the gear oil doesn"t even come up to the axle shafts when tractor is parked, thus all the seals have to stop, is suspended oil from transmission action. Doesn"t take an aerospace seal for that.

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City-Boy McCoy

12-12-2006 16:05:58




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 Re: Farmall 100 transmission leaks???????????????? in reply to Hugh MacKay, 12-12-2006 15:10:37  
And Patrick.... Get yourself an Operator's Manual. It would give you the capacities of your tranny as well as show you where the overfill plug was located.
If you already have a manual, get familiar with what is in it. It is a great resource.
mike



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CNKS

12-12-2006 14:44:05




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 10:08:30  
There are no overflow ports. Definitely use at least 90W. The transmission is notorious for grinding gears, and you need something to slow the gears down after pushing in the clutch. That transmission simply was not designed for anything less than 90W, but the more modern 80/85W-90's are ok as is 140.



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Red Dave

12-12-2006 12:23:19




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 10:08:30  
First, it should have 90 wt gear lube in it. HyTran is good stuff, but it is a lot thinner than what was intended for that gearbox. Even new seals may not hold HyTran if there is any wear on the differential shafts.

Second, you may have overfilled it. There is a plug on the left-hand side of the transmission, behind the left brake rod, that is the "Full" indication. Take it out. If oil runs out, it is overfull. I have found that these transmissions don't hold quite as much oil as the book says they do. Not by a lot, but about a half quart or so less.

Third, I don't think that the "ports" are intended as an overfill indicator, but they do seem to function as such.

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JayWalt

12-12-2006 11:03:21




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 10:08:30  
While Paintball probably hit the nail on the head, it could also be that any deisel left in the tranny may have thinned out your new fluid. Many people leave the plugs out and let it sit a week or so if It's a decent temp to let all the deisel evapoarte, I myself would put some sort of hose in one hole, and let it come out the other and hook it up to my compressor and run it like 5 psi (if you compressor has trap for water and dirt, dont want that in the tranny). this would help keep fresh air going in to help the deisel evaporate. Maybe drain a bit of fluid into a cup and see if its thinner then the fluid you put in.

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p8ntball329

12-12-2006 10:28:57




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 10:08:30  
The first mistake you made was cleaning it out with diesel fuel. That makes those seals that are 50 years old fall apart rather fast. Those seals will probably need to be replaced.

Hope this helps

Tony



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SuperA-Tx

12-12-2006 14:52:27




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 Re: Farmall 100 transmission leaks???????????????? in reply to p8ntball329, 12-12-2006 10:28:57  
Didnt have a leak one until I used diesel in the gear box to clean it. I thought I was doing good getting all the old stuff out but right after I added the new oil it started leaking. Now I have to get new seals. Wont do that again!



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Patrick Martin

12-12-2006 11:03:02




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 Re: Farmall 100 transmission leaks???????????????? in reply to p8ntball329, 12-12-2006 10:28:57  
Well that's cool with me, I'd rather them fall apart now than later and if that's whats leaking.

Pretty good excuse to rip into the tranny too! :)

Are you sure that is the most probable cause? Are these for sure not overfill holes?



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banjo

12-12-2006 13:56:52




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 11:03:02  
I beleive those ports are for the brake rod. These housings can be used on either side, so there are holes opposite of each other depending on which side they are put on.Just my observation.



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gene bender

12-13-2006 03:36:42




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 Re: Farmall 100 transmission leaks???????????????? in reply to banjo, 12-12-2006 13:56:52  
The final drives are right and left and not interchangeable. There wont be any place for the brake rods if you put them on wrong or get wrong one. The cast diff housings are but dont get wrong final drive on or you will have no brakes.



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tn terry t

12-12-2006 11:30:17




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 Re: Farmall 100 transmission leaks???????????????? in reply to Patrick Martin, 12-12-2006 11:03:02  
someone help me understand something here why in the world would ya put that thin oil in there? didnt they call for 90 weight gear oil? now im not saying that gear oil will stay in there any better, if the seal is leaking its leaking i run 140 in all my letter series tractors



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