Hydraulic Leak

[Smokey160]

New to this, so please excuse my ignorance. I have a 1992 B2150D that has a hydraulic leak that seems to come from the round connector with the three bolts.
I think it connects to the hydraulic gearbox.
I attached a couple of pictures of the blue line that leads to it. My question is there an O ring inside of it that possibly has worn and needs replacing?
Once I start it up, it starts dripping.

 

[Russell King]

Yes there is an o-ring there. You may just need to tighten the bolts up??

 

[Smokey160]

Yes there is an o-ring there. You may just need to tighten the bolts up??

Thanks for the reply. Well, I did take them out and found out that it is part of a whole piece that extends back to the auxiliary block. So, I put them back and tightened them.
where is the o ring located?

 

[Russell King]

I see that there is some o-ring or gasket between the pipe and the pump (marked in red)

There are also some seals at the rear banjo bolt. See item 100 for front and 110 for the rear.

 

[Smokey160]

I see that there is some o-ring or gasket between the pipe and the pump (marked in red)

View attachment 169889
There are also some seals at the rear banjo bolt. See item 100 for front and 110 for the rear.
View attachment 169890

Thank you, sir! That makes sense. From Hat I could see, it appears that I will have to take the auxiliary block off since when I unbolted it the first time it didn’t come down far enough for
Me to see the o ring. Thank you again! I really appreciate your expertise.

 

[Smokey160]

I see that there is some o-ring or gasket between the pipe and the pump (marked in red)

View attachment 169889
There are also some seals at the rear banjo bolt. See item 100 for front and 110 for the rear.
View attachment 169890

Hi Russell, do you know if there is possibly a gasket that is supposed to go on this? I changed the o rings and noticed there’s a four screw hole but the piece only has three bolts and the fourth screw hole is covered by the piece. There wasn’t a gasket but I thinking there’s something that needs to go there because after I tighten the bolts and start the unit it is still leaking from there.

 

[Russell King]

There would NOT be a gasket there. Did you get the OEM o-ring? If not, I suggest you get the o-ring from the dealer to make sure it is the correct size.

I imagine that there is some groove cut into one of the parts to hold the o-ring. I further think that would be the pipe. You may want to put some silicon grease in the slot to hold the o-ring in place.

Please take some pictures of the parts when they are apart since I don’t understand how there could br four holes in that pipe part. The tube should enter the end piece through a hole and be brazed in place. That braze joint should be rugged but they have been know to fail.

Clean the area really well and apply some baby powder to it and then run it for just a few seconds to see where the leak is starting from.

@TheOldHokie and @North Idaho Wolfman may have other ideas about what the problem is with the joint. They will get a notice that they were mentioned here and will hopefully make a comment to help you. I have never had much trouble with leaks at that type of joint.

One other thing to look at is if the bolts are too long and bottoming out in the threaded hole. You could add a washer or two to each bolt to see. Or just order the correct bolts #80 in the diagram above.

But if this was fine before, and didn’t leak, I wouldn’t worry too much about the bolts.

 

[Smokey160]

There would NOT be a gasket there. Did you get the OEM o-ring? If not, I suggest you get the o-ring from the dealer to make sure it is the correct size.

I imagine that there is some groove cut into one of the parts to hold the o-ring. I further think that would be the pipe. You may want to put some silicon grease in the slot to hold the o-ring in place.

Please take some pictures of the parts when they are apart since I don’t understand how there could br four holes in that pipe part. The tube should enter the end piece through a hole and be brazed in place. That braze joint should be rugged but they have been know to fail.

Clean the area really well and apply some baby powder to it and then run it for just a few seconds to see where the leak is starting from.

@TheOldHokie and @North Idaho Wolfman may have other ideas about what the problem is with the joint. They will get a notice that they were mentioned here and will hopefully make a comment to help you. I have never had much trouble with leaks at that type of joint.

One other thing to look at is if the bolts are too long and bottoming out in the threaded hole. You could add a washer or two to each bolt to see. Or just order the correct bolts #80 in the diagram above.

But if this was fine before, and didn’t leak, I wouldn’t worry too much about the bolts.

So, I took the Kubota # from the diagram you sent me and went to Kubota dealer. They said that number had been changed by one digit. I purchased three so I could add the other two on the other end.
I misspoke on the extra screw hole. It is actually on the gear box where this piece attaches. I didn’t notice it until today when I was changing the o rings. So the piece with three bolts holes actually covers the fourth bolt hole on the gear box.
I picked up some silicon grease this evening, and I do as you instructed tomorrow and get some pictures and let you know what happens. Never heard of the baby powder idea, but it makes sense.
Thank you again for your patience with me and the insight! I’ve had this tractor for 22 years. It only has 425 hours but I had tried to keep it maintained. I’m no tractor expert but I’m trying to learn.

 

[TheOldHokie]

So, I took the Kubota # from the diagram you sent me and went to Kubota dealer. They said that number had been changed by one digit. I purchased three so I could add the other two on the other end.
I misspoke on the extra screw hole. It is actually on the gear box where this piece attaches. I didn’t notice it until today when I was changing the o rings. So the piece with three bolts holes actually covers the fourth bolt hole on the gear box.
I picked up some silicon grease this evening, and I do as you instructed tomorrow and get some pictures and let you know what happens. Never heard of the baby powder idea, but it makes sense.
Thank you again for your patience with me and the insight! I’ve had this tractor for 22 years. It only has 425 hours but I had tried to keep it maintained. I’m no tractor expert but I’m trying to learn.

Based on your description the fourth hole is a hydraulic port and I would expect there is a groove or counterbore in one side for an oring.

Dan

 

[Russell King]

Based on your description the fourth hole is a hydraulic port and I would expect there is a groove or counterbore in one side for an oring.

Dan

Dan,

I think he means that the pump (I assume that is what the pipe is attached to) has four threaded bolt holes in it, while the pipe has only three clearance holes. But I may be way off base again.

 

[TheOldHokie]

Dan,

I think he means that the pump (I assume that is what the pipe is attached to) has four threaded bolt holes in it, while the pipe has only three clearance holes. But I may be way off base again.

Based on the parts diagram it looks like the pump has three threaded holes @120° and an o-ring port in the center. Standard practice for Kubota The banjo has an o-ring groove on each side.

Dan

 

[North Idaho Wolfman]

Based on the parts diagram it looks like the pump has three threaded holes @120° and an o-ring port in the center. Standard practice for Kubota The banjo has an o-ring groove on each side.

Dan

On that hydraulic pump there are 4 bolt holes, they only use three of them, the fourth is just covered by the flange.
The bolt hole is not a through hole so no fluid leaks.
The O-ring is in the center so the 5th hole.

 

[TheOldHokie]

On that hydraulic pump there are 4 bolt holes, they only use three of them, the fourth is just covered by the flange.
The bolt hole is not a through hole so no fluid leaks.
The O-ring is in the center so the 5th hole.

Interesting. The 4 bolt flange pattern is an industry port standard but an OEM only using 3 bolts is bizarre. Thanks for the clarification. Did Kubota do this on other models?

Dan

 

[North Idaho Wolfman]

Interesting. The 4 bolt flange pattern is an industry port standard but an OEM only using 3 bolts is bizarre. Thanks for the clarification. Did Kubota do this on other models?

Dan

Yes, I've seen it a couple of times too, there is also some that only use 2 of the 4 holes.
My l3450 is one of those models.