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Show Parts for Model:

Too much lube in M gearbox

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Patrick HMD

02-10-2013 23:57:15

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I have a major oil leak in my right brake pinion shaft, Upon removing all the parts to get to the oil seal, I noticed a little seepage around the brake pedal shaft seals. Decided to fix those too. As soon as I pulled the pedal shaft out, oil started seeping out. Then I removed the the plug that checks the oil level and it started oozing oil out too. I then put a 5 gal. bucket under both outlets and so far it's about 3/4 full. Anyone else ever experience this? I do realize that water displacement is the cause of all this. I also think that the excessive amount of fluid may be the cause of the oil leaks. If not all of them, maybe some.
I also have a leak around the belly pump area. Looks like toward the rear which makes me suspect the tranny oil seal maybe leaking. Not sure if the excessive amount of fluid is causing this or the seal needs replacing. If I do have to replace the seal (of which I have no clue as how to) will I have to drain the tranny before getting to the seal? What say ye?

Everything else in the rear area is super dry and tight. I'm planing on doing a good drain flush with some diesel later on.




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Patrick HMD

02-13-2013 14:05:28

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 Re: Too much lube in M gearbox in reply to Patrick HMD, 02-10-2013 23:57:15  
Thanks for the feedback guys. I have to make one minor correction. The pedal shaft is about 1" higher than the over fill hole. That's measuring from the floor.



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02-11-2013 20:10:03

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 Re: Too much lube in M gearbox in reply to Armand Tatro, 02-10-2013 23:57:15  
If it has been stored outside in the rain you can get water into the transmission that will build up the level of the oil. First remove the bottom drain plug and see if you get any water. If yes then do the diesel flush already mentioned. The peddle shaft is always below the level of the oil so good seals are absolutely necessary there. Other seals are above the oil level and do not have to be as good. They tend to always leak if the oil level gets too high.

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Dean Olson

02-11-2013 03:43:56

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 Re: Too much lube in M gearbox in reply to Patrick HMD, 02-10-2013 23:57:15  
Excess fluid is not causing the leaks, just makes them show up. Yes you'll need to drain the fluid. Probably needs to be done anyway. Flushing with diesel is a great idea. Being the trans takes 13 gallons of gear oil it will take about the same amount of diesel to get a thorough flushing done.

I drained the oil in my SH, changes all the seals, then flushed with diesel. Found a newly replaced seal leaking and redid it. If they don't leak with the diesel they won't leak with gear oil.

Check the archives on changing the seal. Not a bad project. I haven't done an M but my SH was easy.

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