Having trouble connecting the quick connect to my my asv rc 100. I press the pressure release, but it still won't connect. End up disconnecting the hose at the bucket to relieve pressure then it will connect. major hassel. Anyone having the same problem our anyone know why it is so hard, or does anyone have a fix.? Thanks jaw50
Trouble with quick connect fittings
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J_J
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It is the temp difference that causes this problem.
Wiggle the levers on the tractor to relieve part of the problem.
I just push the male QD on a hard surface, and as a last resort, I unscrew the fitting.
Wiggle the levers on the tractor to relieve part of the problem.
I just push the male QD on a hard surface, and as a last resort, I unscrew the fitting.
oldbones
Bronze Member
I've always pushed the lever into float before I disconnect hydraulic hoses, and push it into float before I hook up. Has worked for 35 years on my farm machinery. Hard to hook up hoses when there is any pressure on the hose or the scv.
J_J
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What did you do to keep implements from developing hyd pressure cause by temperature.
oldbones
Bronze Member
nothing. never been a problem.
J_J
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We will have to take your word for that. It is truly amazing that just about anybody that has owned implements with hyd's, has had trouble at one time or another.
An implement with hyd cyl and hoses left out in the sun will build up a lot of pressure.
What technique do you have to avoid pressure build up, caused by heat expansion.
Just going into float isn't going to solve the problem.
Both balls or poppets in the QD's have to move to connect. The implement side is the trouble side.
An implement with hyd cyl and hoses left out in the sun will build up a lot of pressure.
What technique do you have to avoid pressure build up, caused by heat expansion.
Just going into float isn't going to solve the problem.
Both balls or poppets in the QD's have to move to connect. The implement side is the trouble side.
oldbones
Bronze Member
J. J.
I try to keep everything under roof if possible. Before I had ample machine sheds, some stuff had to set out. I'm not going to get into a long, drawn out running debate with you about pressure increase due to heat, etc. I just know that I don't have trouble with it. You can "take my word for it" if you like, or don't - your choice.
The reason to put it in float before disconnecting is to relieve ALL pressure from the hoses before disconnect. As we all know, if there is pressure on it when you disconnect, it's going to be there when you try to reconnect, unless you have a leak. And hoses will disconnect under pressure much more easily than they will reconnect under pressure.
Just watching for the "relax" in the hyd hose is a guess as to whether the pressure is completely off or not. When the hyd lever is in float, there is NO pressure on the hose. The reason to put lever in float before hookup is to make sure there's NO pressure on the tractor's scv before trying to reconnect.
Yes, I used to have trouble occasionally reconnecting until I actually sat down and read the manual for my field workhorse (JD 8100 MFWD) where it suggested to do the float thing to avoid the reconnect trouble. I have multiple hydraulic cylinders on my implements (27' folding field cultivator, 12 row semi-mounted vac planter, disk ripper, disk, batwing mower, moldboard plows, sickle mower, numerous hydraulic orbit motors, and a loader on the loader tractor that rarely comes off), and don't have problems. I have one old tractor that doesn't have a float position, and for that one I just turn off the tractor and release the hyd pressure with the lever before disconnect
What can I say? Just luck? Maybe the Deere engineers know something?
I try to keep everything under roof if possible. Before I had ample machine sheds, some stuff had to set out. I'm not going to get into a long, drawn out running debate with you about pressure increase due to heat, etc. I just know that I don't have trouble with it. You can "take my word for it" if you like, or don't - your choice.
The reason to put it in float before disconnecting is to relieve ALL pressure from the hoses before disconnect. As we all know, if there is pressure on it when you disconnect, it's going to be there when you try to reconnect, unless you have a leak. And hoses will disconnect under pressure much more easily than they will reconnect under pressure.
Just watching for the "relax" in the hyd hose is a guess as to whether the pressure is completely off or not. When the hyd lever is in float, there is NO pressure on the hose. The reason to put lever in float before hookup is to make sure there's NO pressure on the tractor's scv before trying to reconnect.
Yes, I used to have trouble occasionally reconnecting until I actually sat down and read the manual for my field workhorse (JD 8100 MFWD) where it suggested to do the float thing to avoid the reconnect trouble. I have multiple hydraulic cylinders on my implements (27' folding field cultivator, 12 row semi-mounted vac planter, disk ripper, disk, batwing mower, moldboard plows, sickle mower, numerous hydraulic orbit motors, and a loader on the loader tractor that rarely comes off), and don't have problems. I have one old tractor that doesn't have a float position, and for that one I just turn off the tractor and release the hyd pressure with the lever before disconnect
What can I say? Just luck? Maybe the Deere engineers know something?
olde man
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there is a heck of a climate difference between where you guys are from. here in pa i only have trouble with our haybine when someone stows it in the raised position
J_J
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Just some more reading material about thermal expansion. I did not know the pressure could get that high. It has been my intention to put a gage in a hyd implement circuit and observe the actual pressure for a certain condition.
Copy:
Snap-tite's CP74 Quick Disconnect Coupling Solves Thermal Expansion Issues
Product Information
The sun and the heat it generates is a source of life and energy for our planet. It's also the source of many headaches for the hydraulic engineer, one of them being thermal expansion.
While construction and utility equipment manufacturers experience the brunt of the sun's effects, manufacturers of skid-steer loaders may have the toughest challenge of all. Often, thermal expansion creates pressures of over 2000 psi, preventing standard quick connect couplings from connecting as designed. Compounding this issue was the decision made long ago to "key" the proper hose connections by using both a coupler and nipple on both the loader and attachment.
Herein lies the problem, to easily connect an attachment containing trapped pressure due to thermal expansion, both the nipple (male half) and the coupler (female half) would be required to connect while under pressure. Presently, users must remove or otherwise manipulate the coupling's valve to relieve the pressure, defeating the purpose of using a quick disconnect in the first place. Why should the user be forced to manually relieve the pressure and possibly damage the coupling, or endanger the environment with the subsequent spillage?
As if these demands weren't tough enough, the industry also mandated that they design a coupling that meets ISO-16028, an international specification for interchangeable, push-to-connect, dry break couplings.
Patented Design
Using the latest 3-D modeling software, Snap-tite's engineers designed and patented the Series CP74 coupling. While being able to connect to any manufacturers' ISO-16028 compatible design, either the nipple or coupler will connect to static pressures of up to 3625 psi.
The CP74 solution saves time, prevents damage and protects the environment while maintaining the interchangeable criterion of ISO-16028.
Copy:
Snap-tite's CP74 Quick Disconnect Coupling Solves Thermal Expansion Issues
Product Information
The sun and the heat it generates is a source of life and energy for our planet. It's also the source of many headaches for the hydraulic engineer, one of them being thermal expansion.
While construction and utility equipment manufacturers experience the brunt of the sun's effects, manufacturers of skid-steer loaders may have the toughest challenge of all. Often, thermal expansion creates pressures of over 2000 psi, preventing standard quick connect couplings from connecting as designed. Compounding this issue was the decision made long ago to "key" the proper hose connections by using both a coupler and nipple on both the loader and attachment.
Herein lies the problem, to easily connect an attachment containing trapped pressure due to thermal expansion, both the nipple (male half) and the coupler (female half) would be required to connect while under pressure. Presently, users must remove or otherwise manipulate the coupling's valve to relieve the pressure, defeating the purpose of using a quick disconnect in the first place. Why should the user be forced to manually relieve the pressure and possibly damage the coupling, or endanger the environment with the subsequent spillage?
As if these demands weren't tough enough, the industry also mandated that they design a coupling that meets ISO-16028, an international specification for interchangeable, push-to-connect, dry break couplings.
Patented Design
Using the latest 3-D modeling software, Snap-tite's engineers designed and patented the Series CP74 coupling. While being able to connect to any manufacturers' ISO-16028 compatible design, either the nipple or coupler will connect to static pressures of up to 3625 psi.
The CP74 solution saves time, prevents damage and protects the environment while maintaining the interchangeable criterion of ISO-16028.
I keep the implement fittings hooked to each other to keep them from getting dirty when not in use, but that shouldn't help or hinder me with respect to temp.
I've only had to unscrew a fitting once, and that was because pressure built up because the fitting was bad, so it didn't get hooked up properly before it was run.
Temp doesn't seam to be a big deal. I've hooked and unhooked on days when the temp has been in the triple digits, and others were it was in the negative double digits. That's way more swing than you'll likely see in Florida.
I've only had to unscrew a fitting once, and that was because pressure built up because the fitting was bad, so it didn't get hooked up properly before it was run.
Temp doesn't seam to be a big deal. I've hooked and unhooked on days when the temp has been in the triple digits, and others were it was in the negative double digits. That's way more swing than you'll likely see in Florida.
