Yanmar 336D Power Steering Leak from TOP seal area

kkwc · Jul 9, 2010

Hello All:

First post to this forum so here goes:

Wondering what would cause a power steering (p/s) leak from the top seal area of my p/s box? There is a large tube bolted to the p/s unit that goes up to the steering wheel. I suspect the seal is leaking but I am wondering if anyone can tell me WHY? Have not taken apart as yet but started leaking after I was running it in creeper gear back and forth trying to line up the frame mounted backhoe. Involved lots of full turn use of steering wheel. Tractor has never leaked in the p/s area or system before. Seems ODD that it would just start out of no where. Not pouring out but a good leak, about 1/4 cup of hydraulic fluid or less an hour, enough to get all over the transmission and etc within 5 minutes of cleaning it all up. I have changed the hydraulic fluid with in the last 100 hours of use. Quality specked fluid and new quality name brand filter.

So:
>>>> What do I need to order?
>>>> Any tricks or advice?
>>>> What caused the leak?
>>>> Why did it start so fast?

All in all a GREAT tractor! Real work horse and then some.

Also looking for a gear housing for a Bush Hog model 255 - obsolete according to the manufacture, "Glad I bought a NAME brand" Hum..........

Thanks for the help,
Ken C

Nofbdybs · Jul 9, 2010

(quoted from post at 10:03:30 07/09/10) Hello All:

First post to this forum so here goes:

Wondering what would cause a power steering (p/s) leak from the top seal area of my p/s box? There is a large tube bolted to the p/s unit that goes up to the steering wheel. I suspect the seal is leaking but I am wondering if anyone can tell me WHY? Have not taken apart as yet but started leaking after I was running it in creeper gear back and forth trying to line up the frame mounted backhoe. Involved lots of full turn use of steering wheel. Tractor has never leaked in the p/s area or system before. Seems ODD that it would just start out of no where. Not pouring out but a good leak, about 1/4 cup of hydraulic fluid or less an hour, enough to get all over the transmission and etc within 5 minutes of cleaning it all up. I have changed the hydraulic fluid with in the last 100 hours of use. Quality specked fluid and new quality name brand filter.

So:
>>>> What do I need to order?
>>>> Any tricks or advice?
>>>> What caused the leak?
>>>> Why did it start so fast?

All in all a GREAT tractor! Real work horse and then some.

Also looking for a gear housing for a Bush Hog model 255 - obsolete according to the manufacture, "Glad I bought a NAME brand" Hum..........

Thanks for the help,
Ken C

Congrats on owning the GREATEST compact tractor,,,EVER

Anyhow, we have a 336d also.
Same issue that you have, though, ours was leaking fluid UP THROUGH the steering shaft housing, and comming out in the center of the steering where the horn is :shock:

Anyhow,,,

and ill have to check with pops on this, but IIRC, there is an O-ring seal just below where the shaft housing meets the PS housing. It had worn flat.
Its pretty straightforward, and IIRC, we just matched up an o-ring from a local supply house. That was about 5 years ago, and its going fine.

We did the entire repair in about 4 hours, and we did a LOT of rewiring while we were in that area. Ill ask dad to refresh my memory, but IIRC, it was a simple o-ring.

kkwc · Jul 9, 2010

You are correct, it is leaking above the p/s shaft seal into the housing that goes to the steering wheel. Think you are right in that it is leaking from the VERY top by the steering wheel.

Thanks, I'll tear into it and look for a damaged "O" ring.

Thanks again,
Ken C

Yanmar 336D Power Steering Leak from TOP seal area

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