Oil leak on John Deere 60 belt pulley

[Earlebird]

Got JD 60 back from engine overhaul and belt pulley slings a little milky oil after running awhile. Then the clutch broke. I m no mechanic but enjoy tinkering so took clutch apart and found the fork broke and the shield behind pulley was filthy with a clogged drain hole. Also found the pulley bearing was missing and obviously the old sharecropper who worked for my uncle had packed it with oil soaked paper in an attempt to remedy situation. Got all parts ordered and cleaned up and ready to install. The first reduction gear has milky gear oil on it which is obviously contaminated with water. The engine oil looks fine. So if the clutch mechanism is lubricated with engine oil which is supposed to drain back into the crankcase through the now cleaned out drain hole, why did I find milky gear oil in it when I took it apart? I don t understand what keeps the transmission oil on the first reduction gear separate from the engine oil behind the belt pulley. Obviously I m going to drain, flush and refill the transmission, but I m afraid something inside the first reduction gear housing may not be right even though the tractor runs and drives fine. There are no 2 cylinder guys in my area. Sadly most are dead. The old guy who rebuilt it did his best but the clogged drain hole makes me doubt him. And yes I have the IT shop, parts and owners manual. Thanks foe any help!

 

[Bob]

There's two seals AA5122R (Key #29) (only one is shown) installed back-to-back next to the RH crankshaft main bearing to keep the engine oil and transmission oil separate, the reduction gears run in transmission oil.

<img src = "https://i.imgur.com/8AbjOff.jpg">

 

[h3llbilly]

I most recently put a G back together
that I had completely dismantled.

On those, it's my opinion that returning
rogue oil was the intent. The cover was
basically open but partitioned for the
first reduction gear and R.H main/clutch
assembly. There is a return hole in the
housing beneath the clutch assembly for
rogue oil. The main bearing shim packs
are soldered facing the crank journal and
when tightening the mains, I always used
a screwdriver to push the soldered shim
packs against the crank creating a "seal".

I don't know if it's the same for the 60
but on the G's, I am unaware of any
external oiling, piped or passages, into the first reduction
cover.

I do know that two cylinders left outside
are not water tight. It's not uncommon,
that over the years, rain water would
fill the rear end housings and force oil
(and water) into places it shouldn't be,
ruining various seals, gaskets, and
freezing and busting things.

 

[Bob]

(quoted from post at 09:44:22 03/03/20) I most recently put a G back together
that I had completely dismantled.

On those, it's my opinion that returning
rogue oil was the intent. The cover was
basically open but partitioned for the
first reduction gear and R.H main/clutch
assembly. There is a return hole in the
housing beneath the clutch assembly for
rogue oil. The main bearing shim packs
are soldered facing the crank journal and
when tightening the mains, I always used
a screwdriver to push the soldered shim
packs against the crank creating a "seal".

I don't know if it's the same for the 60
but on the G's, I am unaware of any
external oiling, piped or passages, into the first reduction
cover.

I do know that two cylinders left outside
are not water tight. It's not uncommon,
that over the years, rain water would
fill the rear end housings and force oil
(and water) into places it shouldn't be,
ruining various seals, gaskets, and
freezing and busting things.

Unlike the "G", the "60" used a "sleeve" main bearing, so no shims, and, as you can see in the parts drawing, a lip seal next to the sleeve bearing to keep the crankcase oil in the crankcase, where it belongs.

 

[h3llbilly]

@ Bob,

Yes sir I know. I was getting at
Earlebird's inquiry about oil(s) in the
first reduction cover. I'm of the opinion
with the G and other lettered series that
there wasn't really supposed to be any or
minimal amounts. (Seeping through
bearings, forced by water, etc.) Whenever
you pull that cover, there is some minute
amount of oil in there, but I don't think
it's from the "oiling" system if that
makes sense.

 

[mdross]

Water will find it's way inside these tractors where ever it can through worn parts and condensation. One spot is the clutch lever bushing no seal there.

 

[Earlebird]

thanks for all the responses