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Harry Ferguson Tractors Discussion Forum
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transmission leak

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John Juergens

06-23-2006 06:38:25




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I have a bad leak of transmission oil in my TO-20 coming out of the bell housing. Before I split the tractor, does anyone have an idea of the likely cause of the leak?




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John Juergens

06-23-2006 07:46:35




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 Re: transmission leak in reply to John Juergens, 06-23-2006 06:38:25  
I'm pretty sure it isn't the engine seal because it only started leaking after I drained the transmission, which was very low on fluid and refilled it. Also, I caught a lot of the oil in a pan and compared it to the engine oil, and it definitely was the same color as the fluid I put in the tranny. Any other thoughts? Maybe a seal in the tranny? Thanks.



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John (UK)

06-23-2006 12:34:40




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 Re: transmission leak in reply to John Juergens, 06-23-2006 07:46:35  
Just a thought, did you use the correct grade of oil in there and not hydraulic oil or gear oil. It should be SAE90 GL1 straight mineral oil or 15W-30 multi-grade.



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DennisPinOhio

06-24-2006 15:35:10




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 Re: transmission leak in reply to John (UK), 06-23-2006 12:34:40  
I am very concerned that I may have put the wrong oil in my trans. The tractor shop I went to sold me 80/90 wt. gear oil. Is this the wrong stuff?



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John Juergens

06-23-2006 12:58:51




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 Re: transmission leak in reply to John (UK), 06-23-2006 12:34:40  
Thanks for all the tips. I did, in fact, use hydraulic oil because the people at the NAPA store told me that was what I was supposed to use. That's how I knew the leak was from the gearbox, it was bright red. How would that effect the leaking, and could it have caused any damage to the seals or other parts of the transmission?



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John (UK)

06-23-2006 13:15:20




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 Re: transmission leak in reply to John Juergens, 06-23-2006 12:58:51  
How do these guys know what should be in there I ask myself.... If you mention Hydraulics to them they immediately think of hydraulics as in a digger. Because the gearbox and rear axle run in the same oil as the hydraulics you can't use a thin oil like the hydraulic oil they sold you it just isn't heavy enough and it will allow damage to the bearings were you to keep running it. It wont do the Pump much harm but it will probably find all the leaks when it is under pressure. It is simply too thin, if you check the grade it will probably be about SAE10 instead of about 40...the oil you use should be as thick as engine oil. If you haven't done much running with it everything should be ok but really the only way to tell is fill it with the correct oil and get it to work. You may find that there is nothing wrong when you have the correct oil, keep your fingers crossed....lol The correct oil from NAPA is art number 65-205 5 galls, it takes 24 us quarts from empty to the full mark and it will take a while to flow from the gearbox to the axle, so just put that amount in and then leave it, that amount will be correct.

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John Juergens

06-23-2006 13:50:10




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 Re: transmission leak in reply to John (UK), 06-23-2006 13:15:20  
Thanks, again. You might have saved me a huge amount of work. Fortunately, I only operated the tractor for about 10 minutes with the hydraulic oil and moved it only about 50 feet to get it to where I could drain all the oil and flush out the entire gearbox. A fair amount of water was coming out with the leaking hydraulic oil, along with some of the original oil that was the color of light brown sand. When I drained all the oil from the gear box almost all five gallons was a tan color, which I assume was dirt and dust from years of neglect. I will put in the right oil and see what happens.

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John (UK)

06-23-2006 15:12:26




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 Re: transmission leak in reply to John Juergens, 06-23-2006 13:50:10  
If you have water in the gearbox it is getting in through the bottom of the gear lever or the felt seal at the bottom of the control spring behind the seat. You really need to fit new seals to stop it.



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John (UK)

06-23-2006 12:31:23




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 Re: transmission leak in reply to John Juergens, 06-23-2006 07:46:35  
Under the clutch housing there are two holes with a split pin through to keep it clear, one is behind the engine and the other is at the back of the clutch housing, if the oil is out of the rear pin hole then usually it is from the transmission and from the front it is from the engine. This is providing both split pins are loose and the hole is clear otherwise any oil will travel to the opposite hole as the level builds up inside. If it is from the rear the leak will usually be from the seal on the main drive shaft into the gearbox, but it also could be from the bottom bearing housing bolted to the front of the gearbox but in the clutch housing. If the oil is clean and it is from the gearbox you do have to look closely to see where it is running from.

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Jim in OH

06-23-2006 07:05:59




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 Re: transmission leak in reply to John Juergens, 06-23-2006 06:38:25  
More likely, in my opinion, to be the rear main seal of the engine. Both require splitting the tractor and the oils are so similar, you probably can't tell without looking for the source evidence... If you want to check, you might be able to tell by pulling the starter. If it has any oil evidence in there, it is probably engine seal... if not, it doesn't eliminate the engine seal, just makes it less likely... Jim

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