2 Fitting Questions

[NCMau]

I am dealing with new 3/8 and 1/2 swivel hydraulic fittings.

Question 1: Even though they are tight, there is a little play up and down. It would make sense that shouldn't any play at all, but I just want to make sure before I crank it any further and break something.

Question 2: What type of clamps are normally installed in suction line between the tank and pump? The standard stainless steel clamps seem to be awful puny for a thick hose like this. Maybe U clamps. I didn't see anything at Surplus Center.

 

[rasimmo]

1. If the fittings are old they may not be fitting together tightly. I would probably change the fittings out if it were mine. Some will say not necessary, but that's just me. I have seen a few break off the flared piece inside the hose fitting also.
2. The standard worm clamps will be fine on the suction side. That is all I have ever seen done.

Edit: Just read your post again. I guess I missed the "new" the first time, sorry. I have not dealt with any that had any play in them. Check the hose ends out good and make sure the mating surfaces are in good shape.

 

[J_J]

I am dealing with new 3/8 and 1/2 swivel hydraulic fittings.

Question 1: Even though they are tight, there is a little play up and down. It would make sense that shouldn't any play at all, but I just want to make sure before I crank it any further and break something.

Question 2: What type of clamps are normally installed in suction line between the tank and pump? The standard stainless steel clamps seem to be awful puny for a thick hose like this. Maybe U clamps. I didn't see anything at Surplus Center.

Are you talking about this kind of swivel? A connector swivel.

Surplus Center - 3/8" NPTF X 3/8" NPTF LIVE SWIVEL COUPLING

This is a swivel fitting, but when it is tight, with no leaks, it does not swivel.

Surplus Center - JIC 6F TO 3/8 NPTF SWIVEL

 

[NCMau]

I have purchased a whole set of hoses (all NPT) with one swivel end from Agri Supply.Some of them are connecting solid but there two so far, that even though are torqued very tight, I can still move the rubber part of the hose 1/32 +/- up and down.
On all these hoses out of the box you can move the threaded male part about 1/16" in and out, as shown in the pics below.
I can't believe they are all defective. Looking inside, there is nothing that I can see, that can the close the gap when it is tighten. I am hoping that when there is pressure applied they will seal. I am in the process of installation so there is no fluid yet.
Any thoughts?

 

[rasimmo]

I never worked with fittings like that before. I don't see what would make that swivel part tighten up when you install it. I guess this will be a "try it and see" case. Sorry I can't help.

 

[J_J]

Thru-the Cover (TTC) fitting.

Male Pipe Swivel (PS) OTC Fittings. outside the cover (OTC

I am thinking it will lock up and be tight under pressure.

Male Pipe Swivel Hydraulic Crimp Fittings

 

[NCMau]

Thanks. I feel better now.

 

[IceStationZebra]

IMHO - I would recommend avoiding NPT whenever possible. It is much easier to get a sealed joint with JIC, no messing with tape or dope, the swivel is built into the female hose end, and there are a lot of elbow options (45, 90, long 90, etc). Put adapters at your valves and cylinders, NPT-to-JIC or ORB-to-JIC. This is the way any self respecting OEM does it.

If you want the Cadillac fittings go with O-ring face seal (ORFS). There provide a very good leak-free joint - but they cost about 20% more than JIC, are physically larger for a given dash size, are harder to get the thread started due to the straight thread, and have a less fitting choices. Some OEMs are willing to make these trade off's to emilinate warrenty work, but I don't normally recommend them.

ISZ

 

[NCMau]

ISZ, what you're saying sounds good and some to keep in mind, but right now my whole system is NPT. Got money and time tied-up. Just have to stick it out and see what happens. Thanks.

 

[IceStationZebra]

Understand completely. More advise for the future. ISZ