Quick Disconnect Coupler Wisdom Needed - Size / Type

[2fast916]

Hi!

I am in the process of trying to standardize the QD's on 3rd Function for two different tractors (an LS 40-hp & a Kubota B2650). I printed the following sizing chart on Letter size paper and compared to both tractors and attachments.

http://www.discounthydraulichose.com/v/vspfiles/downloadables/qd_sizechart.pdf

The LS shape and size lines up with ISO 7241-1 Series A 3/8" size, the Kubota lines up with ISO 7242-1 Series B 3/8" size, and some attachments that are used with the LS line up with AG QD's.

Since I'm new to hydraulic QD sizing and application, I was hoping someone could guide me by answering the following questions:

Q1: Is there any advantage to one particular type vs. another (i.e. Ag, 7241-1 A, 7241-1 B, flush or flat face)? Obviously the LS will have the higher flow requirements so, I would want to mirror that QD on the Kubota. I have also been previously guided from the forum that Ag will work with Series A but, not with Series B....so right now, I'm thinking I should switch the Kubota to Series A?

Q2: According to the sizing chart, it looks like I would need to buy 3/8" QD's for whatever type I've chosen to go with. Do I need to be worried about the size of the hydraulic hose thread diameter / pitch too? Or do I just order 3/8's QD's?

Any other guidance is more than greatly appreciated!!!

Thanks!

 

[2fast916]

In conjunction with this post, I emailed the same to Discount Hydraulics and there were the two responses received....thought I would post for others to be in the know:

 

[2fast916]

"The drawings are actual size. If you printed the chart at 100%, then the drawings should match your couplers correctly."

Ken Hutchinson
Customer Service
DiscountHydraulicHose.com

 

[2fast916]

"There are only marginal differences in performance between the three types of quick disconnects you mentioned. The AG style (ISO 5675) with a ball on the tip are by far the most common on farm equipment and tractors, but some people claim that the poppet style (the valve tip is pointed instead of round) provide improved flow characteristics.

As far as thread size, you do need to make sure your hoses have the right fittings or adapters on the ends to connect to your QDs. The most common thread is NPTF (pipe thread) in the same size as the QD. Following this tradition, our 3/8" ISO 7241 style QDs all have 3/8" NPTF threads. The ISO 5675 (AG Interchange) QDs come standard with 3/8" NPTF, but there are alternatives on our site with other threads also."

Ken Hutchinson
Customer Service
DiscountHydraulicHose.com

 

[Tractor Seabee]

Appears the 3/8 pipe tread is the common denominator. Pick the one you have the most of and change the others to match. My kubota has Parker fittings which are very common anywhere you go; your local hydraulic dealer probably has them in stock and don't cost an arm and a leg. You can buy them on line many places. Your tractor dealer's parts counter is probably the most expensive.

Ron

 

[2fast916]

Appears the 3/8 pipe tread is the common denominator. Pick the one you have the most of and change the others to match. My kubota has Parker fittings which are very common anywhere you go; your local hydraulic dealer probably has them in stock and don't cost an arm and a leg. You can buy them on line many places. Your tractor dealer's parts counter is probably the most expensive.

Ron

Thanks!

When you say Parker fittings...are these the Ag fittings? If so, that's what I'm leaning towards standardizing with since it seems to be very common in the U.S.

 

[rswyan]

I believe skid-steer flush-face couplers (ISO 16028) offer better flow characteristics and are certainly less messy as far as fluid loss goes (almost no fluid loss whatsoever as compared to ag style couplers) ... and female ISO 16028 QD's don't seem to be as inclined to collect dirt and debris as the ag style female QD's.

Don't understand why more folks don't go that route.

 

[kennyd]

Don't understand why more folks don't go that route.

$$$$ is the reason. FF couplers are a lot more money, that's whe we don't carry them.

 

[rswyan]

$$$$ is the reason. FF couplers are a lot more money, that's whe we don't carry them.

Depends on where one sources them I guess.

I replaced all of the ag style couplers I had on my equipment with SS/FF QD's from these guys for pretty cheap (no affiliation or remuneration, just a satisfied customer):

Flush Face Coupler

They're a China product ... but I find that in terms of hydraulic fittings, that's what I'm getting from other places as well ... including my local hydraulic shop.

 

[Tractor Seabee]

Your Discount Hose sheet; the Parker 60 under ISO 7241-1 Series B.
Be careful though on the ISO #. They all claim to be interchangeable but minuscule differences can cause them to leak. I would stay with only one brand name and not try to mix brands in the same ISO standard. With my Parkers I do not lose any fluid on connect/disconnect. 1500 hours on my BX with many many disconnects and no problems.

ron

 

[2fast916]

Depends on where one sources them I guess.

I replaced all of the ag style couplers I had on my equipment with SS/FF QD's from these guys for pretty cheap (no affiliation or remuneration, just a satisfied customer):

Flush Face Coupler

They're a China product ... but I find that in terms of hydraulic fittings, that's what I'm getting from other places as well ... including my local hydraulic shop.

Some time has passed, since I started this thread and thought I would just update everyone on my findings / progress. First off, thanks to everyone who responded!!!

On my Kubota B2650, all the fittings on the Backhoe and 3rd Function Connections are all 3/8" and the four Loader connections are 1/4".

Since the Ag (Parker) seemed to be the most common for tractor related implements in the U.S., my first decision was to convert the 3rd Function QD’s to Ag. So I ordered a set from Discount Hydraulics and installed both the Male & Female. After installation, the Female worked great but, I could not get the Male to stop leaking at the “ball.” I tried to exercise it repeatedly by plugging into my grapple’s Female but, I just could not get it to stop dripping. I should also add, that it leaked more when the tractor was running but, also leaked (more slowly albeit) when the tractor was shut down.

The saga continues…and I was caught by curiosity…

Since I’ve never seen a Flush Face SS QD in person, I decided to order a set from Discount Hydraulics to see and potentially use. Once I had them in hand, I loved the design much better than any of the other three types. They seemed much more resistant to collecting and/or cleaning from dirt, etc and I really liked how you could turn the Female QD so, it could not disconnect on the fly. Long story short, I installed the Flush Face QD’s and am completely hooked on their design!!! After a connecting once or twice, it also became very clear what was meant by their “no drip” design…you get hardly a drop of hydraulic fluid on your hands, tractor, ground, etc. when they are disconnected. They are expensive but, it’s a one-time cost that I’m willing to incur…to make my life more enjoyable in the long run.

To date, I’ve only changed the 3rd Function QD’s and my grapple but, have on hand enough couplers to change all my remaining QD’s, including making an adapter between Ag & FF (addresses my initial concern to standardize between the two tractors), and having one set on hand as a spare if issues arise or if I purchase a new implement.

Thought everyone might like to know what I did with all the useful info provided…thanks again!!!

 

[rswyan]

Some time has passed, since I started this thread and thought I would just update everyone on my findings / progress. First off, thanks to everyone who responded!!!

On my Kubota B2650, all the fittings on the Backhoe and 3rd Function Connections are all 3/8" and the four Loader connections are 1/4".

Since the Ag (Parker) seemed to be the most common for tractor related implements in the U.S., my first decision was to convert the 3rd Function QD's to Ag. So I ordered a set from Discount Hydraulics and installed both the Male & Female. After installation, the Female worked great but, I could not get the Male to stop leaking at the "ball". I tried to exercise it repeatedly by plugging into my grapple's Female but, I just could not get it to stop dripping. I should also add, that it leaked more when the tractor was running but, also leaked (more slowly albeit) when the tractor was shut down.

This is fairly typical from what I understand.

The saga continues?nd I was caught by curiosity

Since I致e never seen a Flush Face SS QD in person, I decided to order a set from Discount Hydraulics to see and potentially use. Once I had them in hand, I loved the design much better than any of the other three types. They seemed much more resistant to collecting and/or cleaning from dirt, etc and I really liked how you could turn the Female QD so, it could not disconnect on the fly. Long story short, I installed the Flush Face QD's and am completely hooked on their design!!!

My thoughts as well :thumbsup:

After a connecting once or twice, it also became very clear what was meant by their "no drip" design ... you get hardly a drop of hydraulic fluid on your hands, tractor, ground, etc. when they are disconnected.

If you check various manufacturer's websites you'll find that the fluid loss per connect/disconnect is usually rated in thousandths of a milliliter ... or some similar miniscule measurement in cc's ...

They are expensive but, it's a one-time cost that I'm willing to incur ... to make my life more enjoyable in the long run.

Actually, they really aren't (that expensive) ... depending on where you source them.

If you check the link I previously provided you'll see that they are available from that source for around $11 (1/4") to $15 (3/8") per set ...

That's a set of two ... one male and one female ...

 

[kennyd]

Actually, they really aren't (that expensive) ... depending on where you source them.

If you check the link I previously provided you'll see that they are available from that source for around $11 (1/4") to $15 (3/8") per set ...

That's a set of two ... one male and one female ...

That is crazy cheap. My supplier, as well as DHH is 3-4 times that price per set. I don't know how they are selling them for that. :confused3:

 

[rswyan]

That is crazy cheap.

Yup ... that's what I thought ...

I spent around $200 awhile back to replace everything I had with the flush face units.

Unfortunately, I made an error and ordered too many 3/8" and not enough 1/4" ... fortunately however, shortly after I did it, a local TBN friend was looking to replace some of his AG style that were leaking and I got rid of the 4 extra sets of 3/8" I had.

Need to order some more 1/4" to replace them tonight or tomorrow ... they have an additional 15% off "special" going until the end of April

My supplier, as well as DHH is 3-4 times that price per set. I don't know how they are selling them for that. :confused3:

Who ... the guys I inked ... or your supplier and DHH ?