Quick disconnect quality difference

[SPYDERLK]

I was at the local hydraulics shop getting my fittings and hoses for my new remote valve. I got a real shock when he priced out quick disconnects for me. $29 per female quick disconnect! About $55-$60 for a set - female and male.

They were shiny and silver and beautiful looking and had a "Made In Sweden" on them. I'm just wondering what the difference would be in quality of a set of these vs. a set from TSC - both male and female are $20 and they are steel - interchangable with Pioneer 4000.

I'd like to support the hydraulics shop as they have been very helpful with hoses and fittings but unless there is a good reason for me to go for the $60 ones, I might have to get the cheapo ones at TSC.

To top this off, its not like I plan to take my top and tilt cylinders off anyway ... so don't ask me why I am getting QDs to begin with.

Thoughts?

Along with no leakage I would want ones with minimum pressure loss at flow. Every 200 PSI at 9gpm is more than a horsepower. I think the ones with poppet tip check valves are freer flowing than the ones with ball tips.
larry

 

[QRTRHRS]

The Pioneer couplers are good stuff...JD uses them from the factory.
The ones at the hydraulic shop may have been Flat-Face style and/or connect-under-pressure couplers witch definatly cost more.

I say go for the TSC ones with a good quality Teflon based paste like Locktite #565

kennyd, I have a situation that perhaps you can help me with. My grapple bucket uses the rear outlets for hydraulic power via two hoses routed up to the front of the loader frame and a couple of quick disconnect Pioneer fittings.

I have two problems when I go to hook up. One, I cannot seem to eliminate all of the pressure and two, making the connection with fittings not held by a bracket is quite a feat working alone.

I don't want to make a bracket to hold the fittings. That would complicate loader frame removal.

Those connect under pressure fittings, would they work for me? Thanks in advance.

 

[kennyd]

kennyd, I have a situation that perhaps you can help me with. My grapple bucket uses the rear outlets for hydraulic power via two hoses routed up to the front of the loader frame and a couple of quick disconnect Pioneer fittings.

I have two problems when I go to hook up. One, I cannot seem to eliminate all of the pressure and two, making the connection with fittings not held by a bracket is quite a feat working alone.

I don't want to make a bracket to hold the fittings. That would complicate loader frame removal.

Those connect under pressure fittings, would they work for me? Thanks in advance.

Are you turning the tractor OFF and moving the SCV lever to release the pressure?

Also, when you disconnect the grapple, make sure it's all the way closed so there is not pressure on the cylinder piston thus pressurizing the fluid in the lines. If it's still a problem then you can place a rag over the male QD and push it against the loader frame to help relive the pressure in the hoses that may build up if the grapple sits in the sun.

The connect-under-pressure fitting will work, but they are very expensive-and being that they are not mounted will still cause you grief, all QD's require a lot of pressure to get them connected.


My suggestion would be to use shorter hoses, and add QD's on a bracket where the existing ones for the loader are, then run another set up the loader arms with them other ones and mount the QD's on a bulkhead.

 

[QRTRHRS]

Yes, I am relieving the pressure but I the bucket was in the midday sun. I had not thought about that.

Thanks for the suggestion about moving the QD's back by the loader QD's. That would eliminate the two extra hoses zip tied to the loader frame when I don't need the extra hydraulics. I am going to take a look and fab up something.

 

[3RRL]

Along with no leakage I would want ones with minimum pressure loss at flow. Every 200 PSI at 9gpm is more than a horsepower. I think the ones with poppet tip check valves are freer flowing than the ones with ball tips.
larry

Interesting observation Larry.
Is there a chart or something where that information can be found? That is, which ones are freer flowing?

 

[SPYDERLK]

Interesting observation Larry.
Is there a chart or something where that information can be found? That is, which ones are freer flowing?

I dont know, but Im assuming it is waiting to be found. I have looked for comparative info and will continue.
How free flowing the fitting is is most important when running hyd motors, and Im very interested in that. However, in any constant displacement flow system as most of ours are, many setups include QDs in the main flow line to and from the loader valve and from it to the rest of the circuit. After I put in a pressure gauge on the outlet of my pump and got the system fixed so that air was not entering the suction side, my system began to deliver the full 17GPM spec. Seeing that gauge register 700psi at operating T and full revs just to pump the fluid thru the idle pressure circuit returning to the reservoir made me think. That is 7HP that is totally wasted when the engine is singing! How much of that is attributable to QDs? Are there better ones in the same form factor that tractors use? Im trying to find out. Anyone know where to find flow Q#s on QDs??
larry

 

[milkman]

Anything wrong with these QCs, seem like a good buy, if you can wait on the shipping. Surplus Center

 

[SPYDERLK]

Anything wrong with these QCs, seem like a good buy, if you can wait on the shipping. Surplus Center

They are fine. They are the ball checked type. I have 4 in service. No leaks. I use them for control of cylinders, but would want some more info before I put them in a circuit supplying a 10GPM hydraulic motor because I think they restrict flow more than the poppet check type.

BTW, you can mix poppet and ball type halves w/o complication.
larry

 

[Wayne County Hose]

Larry,

Quick connect hydraulic couplings, ISO 16028, flat face couplings. They are a q.d./selector valve manufacturer. I have their catalog. They have all the info you seek.

For anything other than a small cylinder application, I go with the flush face q.d.'s. They flow way more than the poppet style.

Andy

 

[canoetrpr]

FWIW, I decided to go with the Pioneer QDs from TSC. They seem to pretty good quality - made in the USA and were about a third the price compared to the others I was quoted on.

In my case pressure loss is not really a concern. Heck for the two spools I have plans to use for the TnT, I am going to go with 1/4 hoses to the cylinders so that I can fine tune adjustments.