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Old 09-15-2019   #1
fordtruck03070
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Default L3940 leaking from bellhousing

Hi guys and gals! My first post here and first major work on my tractor....

So, started with a leak from bellhousing. After all the research I did, I came up with front output shaft seal. Split tractor and changed. Couldn't see anything wrong with seal, but for $7 I changed it. While I was in there, did all maintenance, all filters, oil. Suction filter magnet had some "what I'd call drill shavings" on it, which concerned me. Tractor has 1180 HR on it.

After all this, did about 3 hours of bush hogging and raking driveway, Not a single leak. Hooked loader back on, almost immediately leaking like a sieve from bellhousing again!

ANY help would be greatly appreciated! I'm at my whits end with this tractor!
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Old 09-15-2019   #2
eserv
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Default Re: L3940 leaking from bellhousing

Quote:
Originally Posted by fordtruck03070 View Post
Hi guys and gals! My first post here and first major work on my tractor....

So, started with a leak from bellhousing. After all the research I did, I came up with front output shaft seal. Split tractor and changed. Couldn't see anything wrong with seal, but for $7 I changed it. While I was in there, did all maintenance, all filters, oil. Suction filter magnet had some "what I'd call drill shavings" on it, which concerned me. Tractor has 1180 HR on it.

After all this, did about 3 hours of bush hogging and raking driveway, Not a single leak. Hooked loader back on, almost immediately leaking like a sieve from bellhousing again!

ANY help would be greatly appreciated! I'm at my whits end with this tractor!

The usual reason this series of tractor leak from the bell housing is that the sleeve on the front wheel drive drive shaft slips forward out of the seal!! There is a sleeve kit from Kubota to eliminate this problem. you can push the sleeve back into place and install the kit without splitting the tractor.
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Old 09-16-2019   #3
fordtruck03070
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Default Re: L3940 leaking from bellhousing

The sleeve was on shaft solid. Almost like it was glued on, couldn't move it at all.
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Old 09-16-2019   #4
D2Cat

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Default Re: L3940 leaking from bellhousing

Are you positive where the leak originates? On my L4240 I noticed some hyd. oil on lower parts under the transmission. I cleaned everything with brake cleaner and then watched to determine where it was coming from.

What I discovered was under the steering wheel, uhder the floor board is a banjo fitting that is the return line to the cooler in the front. The washers were not sealing there.

I removed the floor mat and then the shield that has three screws. There are a couple of rubber boots that cover the holes you would need to get to.

Maybe not your problem, just a heads up.
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Old 09-16-2019   #5
fordtruck03070
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Default Re: L3940 leaking from bellhousing

Quote:
Originally Posted by D2Cat View Post
Are you positive where the leak originates? On my L4240 I noticed some hyd. oil on lower parts under the transmission. I cleaned everything with brake cleaner and then watched to determine where it was coming from.

What I discovered was under the steering wheel, uhder the floor board is a banjo fitting that is the return line to the cooler in the front. The washers were not sealing there.

I removed the floor mat and then the shield that has three screws. There are a couple of rubber boots that cover the holes you would need to get to.

Maybe not your problem, just a heads up.

No, It is definitely leaking out of bellhousing. Out of weap hole, and front drive shaft sleeve. I don't get it, cause I can operate tractor for hours with no problems. But if I put loader or backhoe on it leaks.
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Old 09-16-2019   #6
kevinj
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Default Re: L3940 leaking from bellhousing

I think it is the trans input and there is an updated housing that needs to be put in.
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Old 09-17-2019   #7
lugbolt
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Default Re: L3940 leaking from bellhousing

Had a GL 40 series a while back....HST....the HST was trashed, excessive pressure in the charge pump due to worn shafts/bearings/seals. Similar complaint. Peeing oil out of the clutch housing but worse while running.

Typically the propeller shaft seal leak (the INFAMOUS leak) will leak mostly with the engine not running; however if an HST or trans issue, it'll leak more with the motor running.

So how was the HST trashed? Well after months of trying to figure it out, we finally got the rest of the story. Owner said that the battery was dead (and we knew it was, we had to jump it every time we needed to start it), and he was PULL STARTING it with another tractor. Well that doesn't work very well with HST's. That's what started the process. $6500 repair, preventable by replacing a $150 battery. I didn't even know it was possible to push/pull start an HST transmission equipped tractor. Guy said he'd have to get it rolling pretty good to get it to turn over enough to start. I'm like ARE YOU SERIOUS????

--you can't fix it.
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Old 4 Weeks Ago   #8
fordtruck03070
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Default Re: L3940 leaking from bellhousing

Quote:
Originally Posted by kevinj View Post
I think it is the trans input and there is an updated housing that needs to be put in.

Why would trans input only leak when loader or backhoe are used? I ran for 3+ hours with bush hog and york rake, no problems....right when I put loader on it started leaking bad!
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Old 4 Weeks Ago   #9
fordtruck03070
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Default Re: L3940 leaking from bellhousing

Quote:
Originally Posted by kevinj View Post
I think it is the trans input and there is an updated housing that needs to be put in.
Why would trans input only leak if loader or backhoe is in use?
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Old 4 Weeks Ago   #10
kevinj
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Default Re: L3940 leaking from bellhousing

Quote:
Originally Posted by fordtruck03070 View Post
Why would trans input only leak when loader or backhoe are used? I ran for 3+ hours with bush hog and york rake, no problems....right when I put loader on it started leaking bad!

I have no idea about your exact leak but when I fixed mine the dealer showed me the bulletin for this updated cover(about $35.00 I think)

Mine leaked mostly after heavy PTO use and it takes awhile for it to start dripping.

They claim that they have had no repeat leaks since using the new housing.

Mine is still dry over a year now.
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