Needing Help Identifying Hydraulic Fitting Please

[npalen]

I'm wanting to install a pressure gauge in the lift cylinder line on the Kubota BF350 FEL late 80's vintage. The pic shows the fitting coming out of the front of the loader valve that feeds the piston side of the lift cylinders.

Trying to find a tee that could be attached directly to the the 3/8" Japanese JIS 30 degree male fitting with the hose then attaching to the other end of the tee.
Would prefer a 1/4" NPT Female on the branch of the tee to accept the pressure gauge but may have to adapt.

This tee would be similar to what I need except the valve fitting has, what I would call, an inverted flare.
9291 | JIS 30° Female Swivel Run Tee

Would any of guys (or gals) know of a source?

 

[Oldtractorfixer]

Search "30 deg jis fittings" and you get lots of suppliers for the tee. On the gauge side get your hydraulic shop or tractor dealer to make you a jumper hose from jis to npt.

 

[BukitCase]

Go here

Fitting and Thread Identification

and download the pdf for fitting ID - From your pic, it looks to me like you have GERMAN fittings; check out DIN 7631 Series in that pdf. That's the ONLY style they show that has a "backward" JIC fitting... Steve

Also called Metric 60 degree cone

Hydraulic Fitting Thread Chart | Hydraulics Direct

 

[npalen]

Japanese Coupling Types - Coupling Identification - JGB Enterprises, Inc.

Wondering if this is the series. My valve has the 3/8"-19 British thread. (-6 size)

 

[BukitCase]

Then this is probably the adapter that's screwed into your valve

9004 | BSPP x Metric

Because if you look at the drawing for metric 60 degree, you'll see it's the ONLY one of all that have been mentioned, that actually has a "male" cone seat in its FEMALE threaded ring, and the ONLY one that would actually MATE UP to the one in your picture (assuming same sizes, of course) -

It's hard to be 100% on this without actually being there, but I don't see anything else that comes close... Steve

 

[npalen]

But I'm going to need a tee with female threads and male taper on the first end to adapt to the fitting shown on the valve.
Then the second end of the tee needs to look identical to what's shown in the picture in post #1 to accept the hose, right?
I'm really perplexed with this inverted flare thing thinking it was only used on automotive like brake and gas line fittings.
Seems like some kind of hermaphrodite issue.

 

[BukitCase]

You're right - I was only showing you what ADAPTER you seem to ALREADY HAVE, as seen in your picture screwed into your valve - if that valve really IS BSPP, and not SAE (O-ring Boss, or ORB) then you would need a Tee with the two inline ports a male and female of what's shown (I'm still thinking I'm right about what that is) - then the SIDE port would need to be female NPT if you can find it, otherwise you would need a female NPT to whatever type fitting you CAN find for the side port of the (added) tee to plumb your gauge into.

If, however, that adapter that's shown still in the valve port is actually an SAE (O-ring Boss, or ORB), then you MIGHT be able to find a TEE to REPLACE that adapter - the NEW TEE would need to be ORB and male Metric 60 degree with a side port that's female NPT - If, and I do mean IF, you could find that combo it would keep your hoses almost in the same position as they are now -

BUT - first of all, I'd be surprised if ANYBODY makes such a Tee, plus if you're correct about the valve ports being BSPP then REPLACING the adapter with a TEE WOULD NOT WORK because your chances of getting the BSPP thread to tighten and seal WITH THE SIDE PORT POINTING THE DIRECTION YOU WANT are about 1 in 60...

As tricky as this is getting, I would probably NOT try to do this online unless that's your ONLY option - instead, I'd take that adapter out of your valve and go to your nearest COMPETENT hydraulic shop (if there IS one in your area) with it - tell 'em you want a tee with male/female like your hose, and a side port that's female NPT.

Hope this helps, I know how convoluted these things can get - in my experience the two main traits that help the most are Attention to detail, and STUBBORNNESS - keep coming back as you learn more about it and eventually you'll get your gauge... Steve

 

[npalen]

Steve--your friendly, understanding and helpful advice is very much appreciated.
Our area in Kansas is basically ag oriented with very little industry. Hydraulic shops of competence are fairly non existent. Wichita would probably be the closest at 2 1/2 hour drive.

I'm sure that the existing fitting threads on the valve is BSPP since the OD of .656" and thread pitch of 19 wouldn't match up with anything metric. (to my knowledge at least)

Here is a clip from the Parker catalog on JIS fittings. Notice in the two illustrations at the upper right where is shown the T4 and P4 interfaces. The inverted P4 would appear to be the one on my Kubota.
Sure looks like it anyway, don't you think?

I'm not above making a tee fitting if necessary but would probably need a female threaded swivel to get orientation as you mention. The 19 pitch thread presents a problem for single pointing so would probably have to buy a 3/8"-19 thread tap and die. I have made a few odd fittings by modifying existing ones and that may be a solution here.

 

[BukitCase]

I kinda thought you might be in a "hydraulics free zone", at least for this esoteric an application

You're right, 19 tpi does NOT translate to any of the metric pitch standards I'm aware of, it works out to a 1.3368mm pitch. The ones I usually see run 1.0, 1.25, 1.5, etc...

Went to look at your chart but you forgot the link or pic...

This kind of frustration makes me half glad I only have older stuff - most is either already JIC or it's NPT, which I hate - but it's easy to find NPT to JIC stuff, so I'll use the Hydraulic Loctite on an NPT/JIC adapter and never take it apart again :thumbsup: ...Steve

 

[npalen]

Sorry, here's the pic: I assume it would be the P4 version in the upper right. This is all new to me.

Is this what I'm looking for:
BSPP Swivel Run Tee (3856)


JIS Plug {3 Degree BSPP Thread} (3862)
Could drill and tap this plug for the 1/4" NPT gauge maybe.