BX23 HST Oil Leak

[Page2]

I can't imagine any reason the hydro would be open to the atmo. As someone said earlier, that has to be miscast or cracked. Seal it up.

 

[RStricker]

Yours must have a hole or crack in the housing. While that is semi machined for a filter it is not completed and should not be open in the threaded area or outside area. Ive removed many of those and they are all sealed there


Daryl
Mossy Creek Outdoors
Www.mossycreekoutdoors.com

Thank you. One of the concerns I've had is whether or not this is supposed to be sealed. What you've said is that yes, this is supposed to be closed up. So I can seal this without worrying about it.

 

[RStricker]

Sounds like you are using the wrong oil in it. Buy the Kubota oil design for your unit.

No, I'm using the correct Kubota specified oil.

 

[jigs_n_fixtures]

Nearly all hydraulic reservoirs have a vent of some kind. And if you grossly overfill the reservoir, it can leak fluid. So, first thing to check is how full is it. Guy, I bought my tractor from grossly overfilled it trying to get a line in the sight glass, lined up with a dot. It was overfilled when he started, and thus the fluid was over the sight glass when he started, pouring hydraulic fluid in the fill plug. I add a red dye to the fluid, so it is actually visible.

 

[RStricker]

Sorry to hijack the thread, but a related question: Are these hydrostatic transmissions "flooded" with just an overflow back to the tank/sump/reservoir/transmission casing?

TIA

Sorry, I can't answer this one. With any luck, someone else in this thread can reply.

 

[RStricker]

Nearly all hydraulic reservoirs have a vent of some kind. And if you grossly overfill the reservoir, it can leak fluid. So, first thing to check is how full is it. Guy, I bought my tractor from grossly overfilled it trying to get a line in the sight glass, lined up with a dot. It was overfilled when he started, and thus the fluid was over the sight glass when he started, pouring hydraulic fluid in the fill plug. I add a red dye to the fluid, so it is actually visible.

There is a breather in the adjacent component, and it sits at a higher elevation than does the HST. I've checked the breather and it's open.

 

[RStricker]

Sounds like you are on top of it. Most internally threaded tapered threads on Japanese castings are British Standard tapered thread and not NPT. And there is an interesting historical story behind that.

But if there is an exception to most being British Standard, I would not be surprised to find that it is in the oil filter mounting nipple. Note that most oil filters have internal threads that fit over a short piece of pipe threaded on both ends. Often both ends have a tapered thread. But maybe yours is UNF on one end and oll filter thread on the other.....though does that really make sense?? Might want to check first before forcing something in there.
If the missing spud is really a tapered thread and you end up forcing it, then consider using sealer and leaving it there once it is in place.

I've been able to confirm what I posted above. This is a 3/4-16 UNF threaded opening, not tapered.

 

[FRAN3]

Here's a quick photo I took of the top of my 2005 BX23 HST. I did not have time to get into figuring out what it is made of, or if the Red part is a vent, but it definitely is covered.

 

[RStricker]

Thank you to all who have responded to this thread.

The biggest question I had was, is this supposed to be open? From above I deduce that no, it's not supposed to be open.

So, to plug the hole, I ended up buying a 3/4-16 bolt to use for the plug. I trimmed off the bottom 1/2"+ and put a screwdriver slot in the surface that I'd cut. I cleaned the hole in the casting and put threadlocker on the plug and hole. With any luck, this will fade into history and I won't have to worry about it further.

 

[RStricker]

Here's a quick photo I took of the top of my 2005 BX23 HST. I did not have time to get into figuring out what it is made of, or if the Red part is a vent, but it definitely is covered.

The red part is the top of the breather.