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How hard would this seal be to replace?

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Mike CA

04-04-2008 19:34:29




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I'm stealing this picture from neblinc (sorry Randy)
I think that my leak is coming from the lower do-hicky in the picture. The one with the 3 bolts. How hard would it be to replace it?

How do I make sure that is where it's coming from? It's awfully messy up in there!

third party image



Oh, and here's another thought. If I pull that drive shaft that goes into the pump (It's removed in this pic) would that stop the leak? I don't need the hydraulic pump working. It's only there for show right now.

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Charlie Hays

04-20-2008 16:54:29




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
Thanks for the great information. I'm at the point of changing both seals. I've got the pump out and the universal joint apart. I don't now how to get at the drive shaft seal. How does the flange(?) on the transmission come off?

Also, my M leaks where the axle housing bolts to the transmission. The parts man at the Case IH dealer suggested separating the housing from the transmission and sealing it with silicon. Good idea or bad? I'm getting ready for hay season, my M is aworing tractor.
Thanks for the advise.
Charlie

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1fortyfanatic

04-05-2008 16:09:16




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 Re: How hard would this seal be to replace? in reply to Bill46, 04-04-2008 19:34:29  
Mike, I wouldn't put kerosene in it for two reasons. First, if you don't get it ALL out before you refill, there is a chance of it degrading the lubricant you put in a small degree, and gears are expensive parts. Second, while the first reason is really a very small possibility, I think that when you pop those covers off and look in there with a flashlight, you'll be amazed how clean things are there. If you are concerned about metal shavings inside, a little angle to the drain port and a magnet tool will get those out when you drain. Keep it up brother!

Dave

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Mike CA

04-05-2008 08:28:11




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
Ok, when I get some time I'll clean it up in there and try to figure out exactly where the leak is coming from. Then I'll ask where to get new seals.
If I'm going to drain it, should I refill it with some kerosene, run it around a little bit, and drain that to clean up the inside? I read that on this forum as a way to clean up the transmission gears.



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Bob Kerr

04-05-2008 05:40:29




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
Hi Mike, You can use a can of spray brake cleaner to spray around the shafts and then run it a min or so and see which one is leaking. the leak will show right up! Bad news is you will have to drain almost all the oil out if doing the lower shaft. I would say at a lesurely pace it should only take a few hours to replace the seal. When working on greasy parts, I use a plastic storage tub with kerosene in it and a parts cleaning brush to clean them up.

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1fortyfanatic

04-04-2008 23:37:02




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 Re: How hard would this seal be to replace? in reply to matt a, 04-04-2008 19:34:29  
Oh, and in answer to your question about draining, yes it would be advisable to drain first IF you intend to remove that lower seal cover. Two reasons, first you can drain to a clean pan and save the oil to put back in IF it's fairly new and clean. Second, you avoid having the oil smack you in the face and run down your arm (and all over the concrete) when you take the three bolt cover plate off.

Dave

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1fortyfanatic

04-04-2008 23:14:51




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
Mike, sorry I can't be of more help on the repair itself, but if you can't pressure wash it, or don't have a car wash nearby, then the old fashioned way of clean up may be all that's left, rags! Disposable rags and lots of them. The picture gives the impression that you can get your hands up there. If so, just wipe it down until it is, if not clean, then at least dry. Then you can fire it up for a quick second then see where the leak is coming from.
I tend to think though that if it was the lower seal, the spinning shaft would spray the oil in a straight up and down fashion, and leave the area around the upper seal relatively clean. Whereas if the upper seal is the leaker, gravity AND the spinning shafts would coat everything. Once you get it cleaned up (or at least dried), a very short run should give indication of which one it is. Hope it ain't both. Good luck, and nice job getting this far.

Dave

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Mike CA

04-04-2008 22:14:40




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
Do I have to drain the transmission case first? I'm guessing yes, but I need to ask.



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Steven f/AZ

04-04-2008 20:53:08




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
If you think the leak might be coming from the hydraulic belly pump itself - you can remove the drive shaft for it, drain the oil out of it and see what happens.

The lower seal will leak more than the upper - the upper seal should be above the oil level in the transmission (I think).

To get that lower seal out isn't much trouble at all. Remove cotter pins from the pump shaft, slide sleeves toward middle of shaft, rotate shaft until it drops out the bottom (slots will be vertical). Put tractor in 1st gear, lock brakes, use a square bar to turn the drive slot counter-clockwise to unscrew it from the shaft.

Remove 3 bolts and the seal and retainer should pop right off.

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Mike CA

04-04-2008 20:22:51




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
What is the best way to isolate the leak? I don't have access to a steam cleaner. I have a pressure washer, but I can't do that in my driveway or else I'll be divorced. :?



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Bob M

04-05-2008 05:17:23




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 20:22:51  
Oops - I forgot to mention you gotta also unscrew the slotted drive coupling as mentioned above (thanks Steve!).

No way to isolate the leak before beginning repair. Rather drain a couple gallons from the tranny, or else run the front end up a steep ramp so the oil is at the rear of the transmission. (If it's been leaking a while the oil level will already be way low...)



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Bob M

04-04-2008 19:45:56




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 Re: How hard would this seal be to replace? in reply to Mike CA, 04-04-2008 19:34:29  
Mike - That leaky seal is easly to replace. Simply remove the 3 cap screws, pull off the retainer, then push out the old seal and press in a new one. Finally reinstall the retainer.

Unfortunately you can't just remove the pump drive shaft to stop the leak - it's actually the front end of the tranny countershaft.

----

Note - In Randy's photo it appears the upper (input) shaft seal is leaking too. It's not unusual - frequently both seals fail about the same time.

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