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Massey Harris & Massey Ferguson Tractors Discussion Forum
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transmission leak in MF275

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RonP

03-19-2008 23:21:47




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While I was disking today the MF275 developed a leak where the transmission case bolts to the differential case. There was some brown (almost rusty looking) oil along the top edge where the cases bolt together, and there was a steady drip of black oil from around the cotter pin in the bottom of the transmission case. I probably lost about a cup of oil. Any ideas on what happened inside the transmission case? Is this transmission/hydraulic oil leaking? The level on the stick shows a small decrease in the amount of hydraulic oil, but this oil is a lot cleaner than what"s leaking out around that bottom cotter pin. I probably won"t be fixing this myself, but any ideas on the parts, labor, and cost involved would be appreciated. Thanks.

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RonP

03-20-2008 05:54:58




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 Re: transmission leak in MF275 in reply to RonP, 03-19-2008 23:21:47  
I've looked at this again in the light of day. The oil where the transmission bolts up to the differential wasn't from any break there - it was from the top of the case and it ran down the sides. It looks like a small amount of oil came out of the top of the case that houses the multipower and I guess a hydraulic pump. Whatever oil leaked out from around the cotter pin in the bottom of the casing yesterday is all that leaks - no more leaked overnight and when I moved the cotter pin around no more oil came out. The 3pt hitch worked fine this morning (with no load) and there didn't seem to be any new leak of oil today. The 3pt hitch disk I was using yesterday was very heavy (I added weights to get the blades to go in the ground) and I'm thinking that's what caused the leak. Is there a hydraulic pump up in there that needs to be fixed? Thanks.

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DavidP, South Wales

03-20-2008 12:56:51




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 Re: transmission leak in MF275 in reply to RonP, 03-20-2008 05:54:58  
Hi,
There was a little bit of confusion in your first posting but you have cleared it now. If you have black oil dripping from the split pin on the ubderside of the clutch housing, it is normally the rear crank seal that is leaking.
There are several causes for this;
The seal has become hardened or split.
The engine could be over-filled with oil or the level has risen due to diesel or steering oil leaking into it.
Excessive crank bearing wear will allow a little movement, relieving the pressure slightly of the seal and make it easier for oil to pass.
Have you been working on a steep incline which could allow the level to rise at the rear seal?
Normally it is fair wear and tear on the seal.
DavidP, South Wales

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RonP

03-21-2008 09:54:47




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 Re: transmission leak in MF275 in reply to DavidP, South Wales, 03-20-2008 12:56:51  
Thanks DavidP & jonjon. I haven't been using the tractor on any steep inclines, but it did have a hard workout this week on the road - over 50 miles of travel while hauling and spreading manure. BUT, there is something even more puzzleing (to me) today. When I used the tractor on Wednesday I first noticed the oil dripping. There was enough oil coming out of that transmission area that it was leaking down both sides of where the casing bolts to the differential housing. There was oil all on the bottom of the transmission casing, and it was dribbling (not just leaking) out of the hole with the cotter pin. I probably lost 1/2 to one cup of oil for the time I was watching it (several minutes). There's an open hole (about 1 inch in diameter) that goes through the housing, and it was entirely coated with oil. BUT, when I used the tractor today (pulling a small chisel plow) it leaked much less - just slightly dripping. I kept getting off the tractor to check, and it didn't seem to matter whether the tractor was in high or low range as to how much it leaked. I used the tractor about 4 hours, and the last few times I checked it it wasn't leaking. When I moved the cotter pin no oil came out, and there were no drops of oil on that pin. When I put the tractor in the shed I checked it again and didn't see any drops. So either it's quit leaking for now or is leaking very little. I checked the motor and transmission/hydraulic fluid levels both before I started and when I quit working, and both are still at the full mark. I have no idea what's going on. Maybe the cotter pin was stuck (the tractor had been sitting up for at least two years when I bought it last July) and oil had accumulated in the bottom of the housing, and then finally the pin loosened enough so that the oil in the bottom just drained out at the same time. Do you have an opinion?

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DavidP, South Wales

03-21-2008 12:15:55




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 Re: transmission leak in MF275 in reply to RonP, 03-21-2008 09:54:47  
Interesting!!!!
If you are loosing 'black' oil then undoubtedly its coming from the engine. If its clear/dark then it will be transmission oil. Its always possible that it was residue that's found its way out. If you can, remove the inspection plate from under the clutch housing (be prepared for oil to come out). Using a flashlight inspect the clutch and release bearing etc for presence of oil. If its dry you may be in luck.
DavidP, South Wales

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RonP

03-21-2008 15:46:25




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 Re: transmission leak in MF275 in reply to DavidP, South Wales, 03-21-2008 12:15:55  
I'm thinking the "black" may be due to clutch dust that's mixing with the oil. Other than leaks, should there be any fluid in the bottom of the transmission housing? I know that one of the drain plugs for the transmission/hydraulic fluid is only a matter of inches (maybe a foot or so) back from the plate under the transmission housing. Thanks for your ideas - I appreciate the time and effort you make on this forum. Enjoy the Easter weekend!

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DavidP, South Wales

03-21-2008 16:17:12




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 Re: transmission leak in MF275 in reply to RonP, 03-21-2008 15:46:25  
Hi,
No, there should not be any fluid in the housing.
I think it is unlikely that it is mixing with clutch dust. Removing the plate and having a look inside should show what is happening. Well, will try and enjoy the weekend but have a massive amount of house maintenance to do..... .painting etc Yuk!!!!
Now painting a Massey, that's another story!!!
DavidP



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RonP

03-22-2008 16:05:19




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 Re: transmission leak in MF275 in reply to DavidP, South Wales, 03-21-2008 16:17:12  
Hi! I removed the plate under the transmission housing today. There was no new oil leaking out but quite a bit of grime on the inside of the plate (no pieces of metal though). From what I could see with the flashlight, there was NO oil evident toward the front of the housing - everything up there looked completely dry. There was evidence of where oil had dripped off the large spring on the left (as you're sitting on the tractor). This spring is up a good ways in the casing and toward the back. There was also evidence of where oil had dripped on or from a bolt head at the back of the casing. This bolt holds on some lever, but it wasn't loose (I could reach it easily) and it looked like oil had leaked on it from above. So, whether the leak is (or was) appears to be near the back and near the top of the housing. I ran the tractor for 15 minutes (not in gear, just parked) and there were no drops of oil and when I poked the cotter pin no oil came out. I'll run it again in a few days and have it do some work. Is there any way that an especially heavy load on the 3pt hitch could have caused a leak in hydraulics? I did have two 10 foot railroad ties laying across the disk. Thanks for your ideas - I didn't know what that plate under the transmission was for, but it was neat looking up in there!

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jonjon

03-20-2008 04:41:57




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 Re: transmission leak in MF275 in reply to RonP, 03-19-2008 23:21:47  
If you mean where its bolted together in front of the gearshifts its engine oil.



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