First reduction oil

35gpa · Dec 3, 2014

Just got a new to me 520,jump up from the unstyled's to this. Have the manual so started to change all fluids and noticed it said to drain first reduction and it will take a quart to refill it. But it had over 3 quarts in it??? The transmission was low because when I pulled the check level plug nothing came out.Where did the xtra oil come from that I drained out of the first reduction cover? Thanks

Earl-IL · Dec 3, 2014

If it is just oil, this tractor has a crankshaft main brg. oil seal on the clutch side.

PJH · Dec 3, 2014

It could have came from the transmission or the engine, or might have been overfilled before you got it. That FR oil level/type is discussed often, so you should find lots of discussion by searching the site. I never did think the oil level in the first reduction gear area was critical, or they would have put an oil level plug on the side of the gear cover.

Lee B · Dec 4, 2014

I'm thinking that's backwards Earl, if it's 90w in there then the right main bearing has it's own seal and private return hole for engine oil to the crankcase. If it's engine oil in there then the return hole is under the crankshaft and the seal is a one side sealed ball bearing on the input shaft to the transmission. Older letter series were engine oil lubed, newer types had 90w in there, not sure at all on just when the switch was done either, but you should find out which way is yours since I know mine and yours is not really my business. For both types there is seal somewhere and all too often a mix of oils because the seal hasn't been doing it's job very well.

As stated before, no telling on exactly where the excess came from since you lack the full history on it, quite a few think if some is good, more is better - I would have stopped at two quarts myself. But you might know the answer next time it happens.

Earl-IL · Dec 4, 2014

90 wt or oil ? He didn't say. I would guess its 90 wt.if the trans is low. Look back through the YT Deere archives you will see the 50 plus year old right hand brg. & seal will leak into the reduction cover even though it has a return hole. I have sized many full round main brgs and was amazed at how bad that brg can wear & still not make any noise. Whenever you have to adjust the oil pressure look for loose brgs. I had a engine machine shop for 40 yrs.& I am still learning. But its fun now.

Lee B · Dec 5, 2014

Your single sentence with the description of the type of system involved slipped by me as I could not make sense of it being in the middle like that. A different read and...

I got it now. What I didn't know is IF his is supposed to have 90w in there or not - you do and yes it is supposed to be 90w in there. Yes a worn out main would overload that seal quite easily. Can't say I've ever heard one of these types of mains knocking either, perhaps they are so huge they won't for all practical purposes?

Shop teacher in high school would shake his head at my classmate's father overhauling the A in the school shop as he wiped down the main bearings with an oily rag. I'm learning left and right and if that's the way they do it under the shade tree then it might be OK? It was. They can take a lot of abuse and just shrug it off. He was wiping off the plast-i-gauge for another test which I still use religiously.

First reduction oil

35gpa

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Earl-IL

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PJH

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Lee B

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Earl-IL

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Lee B

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