CUB LoBoy 154 making trans fluid.

A few weeks back, I posted a problem with my Cub 154 leaking trans oil at the gear shift.
I have searched for the post but can't find it.
Before cutting season, last year, I changed ALL fluids as I have done during the 25 or so years I have owned it.
I cut my 3 acre yard all summer with no problems.
In my original post, I stated that oil would come out at the gearshift leaver cap and run down the housing.
All fluids were checked and all were at correct level.
My cub has three fluid check points at the rear of the tractor.
I can mow my yard in LOW GEAR and no fluid escapes.
In SECOND GEAR the fluid escapes.
I checked all fluids again today and the transmission was over full by about one cup. I figure about this same amount has leaked during use.
The other two checkpoints are at the correct level.
I know this seems impossible, however it is happening.
ANY SUGGESTIONS?

Did you let it sit out in the rain? I don't know about Cubs, but some tractors can leak rainwater into the transmission around the gearshift.

Check the drain to see if it is water or oil at the bottom of the transmission.

(quoted from post at 20:44:02 05/12/09) Did you let it sit out in the rain? I don't know about Cubs, but some tractors can leak rainwater into the transmission around the gearshift.

Check the drain to see if it is water or oil at the bottom of the transmission.

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Never been out in weather, at least not in the 25 years I have owned it.
I just finished mowing 2 acres in low gear, no oil escaping, went to second gear and within 500 foot the oil was coming out.
Absolutely makes no sense and has got me baffeled.
I am prone to think it may be a "vent" problem but I cannot find any type vent.

I still think you have a problem with the return hose from the pump, OR could the shifter be wore in just the right place to allow oil to sling out in that area while in second? Another thing, but I dought this, I guess it could be possible that engine oil is getting into it,but I dought that. Only other thing I can think of is are you filling it with the mower up or down.

Jiles:

(quoted from post at 15:36:12 05/12/09)
Never been out in weather, at least not in the 25 years I have owned it.
I just finished mowing 2 acres in low gear, no oil escaping, went to second gear and within 500 foot the oil was coming out.
Absolutely makes no sense and has got me baffeled.
I am prone to think it may be a "vent" problem but I cannot find any type vent.

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Is the Hy-Tran milky looking? For water to be introduced into the tranny is as simple as condensation. That is one possibility.. but it sure doesn't account for the leaking in 2nd gear only.. that would be something totally different. The 154 tranny is pretty much identical to it's big brother/forerunners the Cub and the Cub Lo-Boy... so the best place to get the answers to this problem would be where Cubs are primary. If you want to check out farmallcub.com the Numbered Cubs forum should provide some pretty good advice.

In the meantime, if you are in need of the manuals, some of them are available on my Cub Manual Server. Also the service manuals for the tranny on the Cub and Cub Lo-Boy would be helpful as well.

(quoted from post at 01:26:00 05/13/09) I still think you have a problem with the return hose from the pump, OR could the shifter be wore in just the right place to allow oil to sling out in that area while in second? Another thing, but I dought this, I guess it could be possible that engine oil is getting into it,but I dought that. Only other thing I can think of is are you filling it with the mower up or down.

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What problem could I have with the return hose? There is no fluid leaking, or spraying, from it. I have checked oil level many times and there is little difference in the oil level with the lift up or down.
The cub is stored in my heated and cooled basement, so moisture is not the problem.
I MIGHT ADD that today, I pulled the machine out of my basement and the trans fluid was bubbling with air.
This seems like a hydraulic problem because I don't think spinning gears would cause this.
It was moved about 20 feet.
The hydraulic deck lift works correctly.
This problem has to be corrected and I dred tearing the transmission down to find the problem. ---THANKS for everyones thoughts.

The return hose goes into the top of the cover the shifter is mounted to. If its cracked or the curved peice iscracked in just the right place(s), it could look like the oil is leaking around the shifter. Im just curious as to how you can see it coming from the shifter with all sheet metal on it?

(quoted from post at 11:03:01 05/13/09) The return hose goes into the top of the cover the shifter is mounted to. If its cracked or the curved peice iscracked in just the right place(s), it could look like the oil is leaking around the shifter. Im just curious as to how you can see it coming from the shifter with all sheet metal on it?

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I have removed the sheet metal and belt guard. The oil is definnately coming out the shift lever cover.
I have wiped it clean several times.
There is a plastic or hard rubber cap, similar to 1/2 of a tennis ball, and it moves with th shift lever. This is all about 8 or 10 inches higher then the oil level.