Pipe thread puzzle

[ButchB]

I'm installing a top and tilt on my B2530, very similar to a B2630. I've been through all the threads and I think I have a plan, but the "little things" are tripping me up. It has a factory rear remote valve and block at the rear. (See pics) I purchased a diverter from Spare Parts Holland and a Kubota hydraulic block. Went down to the local hydraulic hose shop and told them I needed some fittings but wasn't sure of the thread. The lead guy went to the back and came back and emphatically said the threads were NPT, so I bought several NPT fittings.





When I got home I tried to thread them in by hand tightening only, and it didn't feel quite right.

I looked up the the drawing for the diverter and the threads are called out as G 3/8. So I've researched that rabbit hole and narrowed down that it's a British standard thread, but there is a BSP and a BSPP. So my question is how to determine which one?

Same on the hydraulic block. I installed the same one I am going to use at the mid port for the FEL, but purchased the two adapter fittings (20) then, so the problem didn't arise. IF nobody knows offhand is there a way to get the specs from the part number?

Thanks

 

[Russell King]

BSPP is the thread used on Kubota’s. The other side of that fitting looks like JIC but there are other threads that look similar.

I would take the fitting you have that fits the block and see if it fits everywhere.

The BSPP fittings will need a sealing washer on the to keep from leaking so be sure you see one on the fittings you buy.

 

[Dustball]

I looked up the the drawing for the diverter and the threads are called out as G 3/8. So I've researched that rabbit hole and narrowed down that it's a British standard thread, but there is a BSP and a BSPP. So my question is how to determine which one?

BSP comes in two flavors- BSPT (British Standard Pipe Taper) and BSPP (British Standard Parallel Pipe).

BSPT is similar to our NPT except that the threads are cut at a slightly different angle and have different pitches. BSPT is sealed by thread tape or sealant. BSPT is also known as R (male) and Rp (female).

BSPP are parallel threads and are sealed by a ring seal or crush washer. BSPP is also known as G.

I use Adaptall's site to find part number of the fitting I need then Google the part number for a vendor. https://www.adaptall.com/products/British/bspp-port.php

Also, find a new hydraulic shop if they had your diverter in hand and still couldn't figure out the fittings.

 

[Smokeydog]

Good you are cautious and asking questions. To the Kubota tractor is usually British. The connecting nipple in your drawing maybe British to NPT sourced from your local dealer.

A good hydraulic shop has helped me many times. Takes an experienced fitter often with test pieces tell some apart.

Most the grease fittings are also British threads!

 

[North Idaho Wolfman]

BSPT to JIS is what that fitting is.

 

[TheOldHokie]

BSP comes in two flavors- BSPT (British Standard Pipe Taper) and BSPP (British Standard Parallel Pipe).

BSPT is similar to our NPT except that the threads are cut at a slightly different angle and have different pitches. BSPT is sealed by thread tape or sealant. BSPT is also known as R (male) and Rp (female).

BSPP are parallel threads and are sealed by a ring seal or crush washer. BSPP is also known as G.

I use Adaptall's site to find part number of the fitting I need then Google the part number for a vendor. https://www.adaptall.com/products/British/bspp-port.php

Also, find a new hydraulic shop if they had your diverter in hand and still couldn't figure out the fittings.

Excellent description and good advice on the choice of shops.

You left out one thing. A female G thread can also be used with a male R thread and a suitable thread sealant.

I will also add JIS pipe threads are identical to BSP threads but the fittings do not fully interchange. They both have 30 degree flare seats but BSP is an inverted flare and JIS is not. JIS also adds a 5/8" (-10) thread size to the parallel list.

Dan

 

[TheOldHokie]

I'm installing a top and tilt on my B2530, very similar to a B2630. I've been through all the threads and I think I have a plan, but the "little things" are tripping me up. It has a factory rear remote valve and block at the rear. (See pics) I purchased a diverter from Spare Parts Holland and a Kubota hydraulic block. Went down to the local hydraulic hose shop and told them I needed some fittings but wasn't sure of the thread. The lead guy went to the back and came back and emphatically said the threads were NPT, so I bought several NPT fittings.


View attachment 138346 View attachment 138345


When I got home I tried to thread them in by hand tightening only, and it didn't feel quite right.

I looked up the the drawing for the diverter and the threads are called out as G 3/8. So I've researched that rabbit hole and narrowed down that it's a British standard thread, but there is a BSP and a BSPP. So my question is how to determine which one?

Same on the hydraulic block. I installed the same one I am going to use at the mid port for the FEL, but purchased the two adapter fittings (20) then, so the problem didn't arise. IF nobody knows offhand is there a way to get the specs from the part number?

Thanks


View attachment 138342

I am not following your description. You already have one rear remote and you need two. So what are you adding and why do you need a diverter?

Dan

 

[ButchB]

I am not following your description. You already have one rear remote and you need two. So what are you adding and why do you need a diverter?

Dan

Thanks for your input. It confirms what I mostly concluded after 2 days on the net researching. As an example, one reference said you could not mix BSPT and BSPP. The IPC (pix on first post) adapters (20), are tapered and worked OK on my loader install. So that confused things. A majority of references said you can mix.

I am installing a top and tilt for occasional use , so I am taking the flow from the rear outlet, (see pix)), to the Kubota block, (40) to a diverter to select the cylinder, instead of the extra expense of a multiplier. I guess I should have asked if there was a better solution.

Thank you very much

 

[TheOldHokie]

Thanks for your input. It confirms what I mostly concluded after 2 days on the net researching. As an example, one reference said you could not mix BSPT and BSPP. The IPC (pix on first post) adapters (20), are tapered and worked OK on my loader install. So that confused things. A majority of references said you can mix.

I am installing a top and tilt for occasional use , so I am taking the flow from the rear outlet, (see pix)), to the Kubota block, (40) to a diverter to select the cylinder, instead of the extra expense of a multiplier. I guess I should have asked if there was a better solution.

Thank you very much

I dont understand that plumbing.

Sounds like you intend to use your one existing factory remote valve to control both cylinders by way of a diverter. That part I get.

Doing that does not have anything to do with the additional outlet block on the tractor. What are you hooking to it and why?

I would expect the adapters for the Kubota outlet block to be 3/8 male NPTF x male JIC-08.

Dan

 

[Smokeydog]

Every time I’ve modified or added function to a tractor especially Kubota, a selection of fittings marked with different types of threads in a few common sizes would be helpful. Luckily the hydraulic shop I like often supplies and performs the maintenance on robotic manufacturing so they are use to the many types. I take what I can to their bench and they help me get what I need from here to there. Added a Kubota soft ride hydraulic accumulators to the M59 and I think there is at least one of every type of fitting in a relative small package.

 

[ButchB]

Sorry about the lag in response to Dan, am working out on the road and didn't have my password.
The hydraulic block in the question, P/N 40, bolts onto the rear outlet when the diamond shaped cover is removed. It has 2 tapped holes for the hose fittings and two drilled holes to secure it to the outlet.

 

[TheOldHokie]

Sorry about the lag in response to Dan, am working out on the road and didn't have my password.
The hydraulic block in the question, P/N 40, bolts onto the rear outlet when the diamond shaped cover is removed. It has 2 tapped holes for the hose fittings and two drilled holes to secure it to the outlet.

I understand the outlet block and have made quite a few.

What I dont understand is we what you plan on hooking to it. You said you purchased a diverter. Is it actually a directional control valve? Can you post a picture or link to what you purchased?

Dan

 

[ButchB]

Diverter Valve Pix attached. Ports are 3/8 BSPP.

Discovered the AG 5675 couplers I ordered for the diverter block, ( the hoses that came with cylinder have male 1/2 AG coupler threaded to 1/2 M BSPP hose end), interfere with each other about .100 when threaded to the diverter. I'm considering just eliminating the coupler, as I can't foresee a need for quick disconnect.




Received fittings for the block, I ordered BSPP to JIC. Turns out the block is BSPT, learned the male BSPP wont connect to a female BSPT, but will work the other way around. Makes sense.

So I have to order more fittings. I see the one vendor has a restrictor listed in his assy, is this something I should include in my order?

 

[Dustball]

How about extending one of the QDs and staggering them?

 

[TheOldHokie]

Diverter Valve Pix attached. Ports are 3/8 BSPP.

Discovered the AG 5675 couplers I ordered for the diverter block, ( the hoses that came with cylinder have male 1/2 AG coupler threaded to 1/2 M BSPP hose end), interfere with each other about .100 when threaded to the diverter. I'm considering just eliminating the coupler, as I can't foresee a need for quick disconnect.

View attachment 139598


Received fittings for the block, I ordered BSPP to JIC. Turns out the block is BSPT, learned the male BSPP wont connect to a female BSPT, but will work the other way around. Makes sense.

So I have to order more fittings. I see the one vendor has a restrictor listed in his assy, is this something I should include in my order?

Forget the threads. What is the diverter being used for?

You keep talkimg about hooking it to the hydraulic outlet block on the tractor. I cant see any purpose that is relevant to the outlet block on the tractor. Please explain what the diverter will do and how this is going to work.

Dan

 

[ButchB]

My plan logic, which may be wrong, is to supply pressure from the factory installed rear remote valve, (second pix), to the diverter so I can select either the top cylinder or the tilt cylinder. I need to attach P/N 40, ( IPC diagram), to the valve outlet to attach hoses from the valve to the diverter.
I appreciate your advice.

 

[TheOldHokie]

I need to attach P/N 40, ( IPC diagram), to the valve outlet to attach hoses from the valve to the diverter.
I appreciate your advice.

Thats not how it works. Forget the outlet block it is not what you seem to think it is and wont work.

To do what you want :

1) Run two hoses from the exiting remotes quick coipler on the tractor to the two IN ports on the diverter.

2) Run two hoses from one set ouf OUT ports on the diverter to the top link cylinder.

3) Run two more hoses from the other set of OUT ports on the diverter to the tilt cylinder

Now your factory remote valve controls both top and tilt. You can only operate one at a time and you use the diverter to switch the OEM valve between top and tilt cylinders as needed.

Dan

 

[ButchB]

Thats not how it works. Forget the outlet block it is not what you seem to think it is and wont work.

To do what you want :

1) Run two hoses from the exiting remotes quick coipler on the tractor to the two IN ports on the diverter.

2) Run two hoses from one set ouf OUT ports on the diverter to the top link cylinder.

3) Run two more hoses from the other set of OUT ports on the diverter to the tilt cylinder

Now your factory remote valve controls both top and tilt. You can only operate one at a time and you use the diverter to switch the OEM valve between top and tilt cylinders as needed.

Dan

There are no installed QC couplers. Here is what is on the tractor:
See pix on first post.

Here is rear outlet description from WSM

 

[TheOldHokie]

There are no installed QC couplers. Here is what is on the tractor: View attachment 139672
See pix on first post.

Here is rear outlet description from WSM View attachment 139672

My bad and I spologize.

I assumed your tractor had the standard Kubota remote valve with outlets like the B2630 you referenced. I have never seen anything like that picture from the WSM.

So indeed you connect the two ports on the outlet block to the IN ports on the diverter.

So back to that plumbing.

Connect the outlet block to the IN ports on the diverter with hoses.

Put 1/4" female quick connects on the other four ports on the diverter. Replace the 1/2" male tips that came with your cylinders with 1/4" male tips.

You now have two sets of 1/4" rear remotes controlled my the OEM valve.

Plug in the TnT hoses and you are good to go.

Dan

 

[ButchB]

My bad and I spologize.

I assumed your tractor had the standard Kubota remote valve with outlets like the B2630 you referenced. I have never seen anything like that picture from the WSM.

So indeed you connect the two ports on the outlet block to the IN ports on the diverter.

So back to that plumbing.

Connect the outlet block to the IN ports on the diverter with hoses.

Put 1/4" female quick connects on the other four ports on the diverter. Replace the 1/2" male tips that came with your cylinders with 1/4" male tips.

You now have two sets of 1/4" rear remotes controlled my the OEM valve.

Plug in the TnT hoses and you are good to go.

Dan

Thanks Dan.

Do you have an opinion on the neeed for a flow restrictor?