Sealant?

[canoetrpr]

While I plan on most likely getting my hoses and fittings made at local hydraulic shop, here's a question that I am eager to get answered.

If I am hooking up hydraulic fittings and hoses, do I need to use a sealant of some sort?

Does this depend on what type of fitting in involved? For example do SAE O Ring or JIC fittings require a sealant? I'm guessing NTP must require a sealant but was sure if SAE O Ring and JIC should (should O Ring or the flare be responsible for an adequate seal without a sealant).

 

[Hoseman]

Hi.

You don't want to use any thread tape or sealant on any female swivels, o ring fittings or flares. Unless it is a solid pipe thread (solid male in to solid female) you don't want to use any. The reason is that tapered pipe seals by crushing the threads in to eachother and the sealant helps prevent leaks.

Flares seal on the angled bevel, boss fittings seal with the o ring in to the groove, flat face fittings seal by the o ring on the face, and female pipe swivels seal by the pipe thread being tightened to the rounded cone.

So don't use anything unless it is on solid pipe, no other threads, and also be sure to not overtighten. Hand tight until it stops swiveling, then quarter turn is all you need. Also, use two wrenches. One on each half to prevent twisting or possibly breaking the fitting.

Brad

 

[canoetrpr]

Hoseman - just want to make sure I understand you correctly.

Are you saying that even if I am using Female NTP swivel to Male NTP, no sealant should be used?

What about say O Ring female (output port of a valve) to a male O ring , no sealant there either right.

So if I am hooking up say a hose with a solid NTP male end to a fitting with a solid NTP female end - that is the ONLY time I need to use sealant.

 

[Hoseman]

Exactly.

O ring - No sealant
Jic/Sae - No sealant
Compression - No sealant
Female pipe swivels - No sealant

The only thing you use sealant on is connecting npt male to npt female. If the female pipe swivels and has a cone inside, it's actually not npt. It is npsm, which is straight pipe as opposed to tapered.

Examples of what you would use it on would be black pipe adaptors, non swiveling female pipe to male pipe connections, etc.

Just think of it this way, if you look at the two sides and see that they'll seal, like with a flare or o ring, then you won't use any. If it has a way it should seal, again like with an o ring or angled part, using a sealant can actually make it leak.

If you're setting it up tomorrow and have specific questions, i can try to help. I work from 8-5 and might be able to help over the phone. Just remember that you only need it on a solid npt to solid npt.

A-1 Coupling
1-800-452-2524

Hope it helped.

Brad

 

[Wayne County Hose]

If you look into a female pipe swivel, you see a 45 degree seat. That's where pipe swivel seats, not on the threads. That's why no sealant is required.

 

[canoetrpr]

Gentlemen:

Thank you very much!

The responses make perfect sense.

I'm not quite ready to set this up just yet but soon I will be able to come up with the $ to afford my project.

 

[Wayne County Hose]

What about say O Ring female (output port of a valve) to a male O ring , no sealant there either right.

On an o-ring, I use a silicone based o-ring lubricant. I have seen people install them dry, but I have also seen them get torn on installation. If you don't have o-ring lube, a little of the fluid you are sealing will work okay for a lubricant.

 

[canoetrpr]

I have another question for you hosemen.

Take a peek at the last photograph in this thread. The hose at the bottom used to plug into the hydraulic block (it has a 90 degree end on it) and as part of the remote installation was joined to another hose.

This is the Kubota kit. Chances are I'm not going to use the Kubota kit but was wondering if I should just go with this type of setup to take the hose back to the rear valve or if I should just replace the whole hose and get a longer one with the appropriate fitting sto go from the loader to the rear valve.

What do you think?

 

[Wayne County Hose]

From looking at the fitting, I would guess that it's 1/2" hose, JIC tube 90 fitting. I've also seen some Kubotas that are British Pipe Parallel. Way more expensive fitting, make sure what you have before you decide what to do. The expensive part is the 90 degree fitting. 1/2" hose ain't cheap either. It depends on what you are comfortable spending. There are also 2 schools of thought.

1. If you do the hose in 2 pieces and one blows, you only buy the part that blew.

2. More connections equal more chances for a leak. It also doesn't look as nice to have more connections on a hose.

I hope I confused you enough. If you already have half the hose, I would just buy what you need and connect the 2.

That's just me and my opinion which is worth what you paid for it.

 

[kennyd]

Here is an older POST with some good info in it also...