Options for dealing with pressure build up in disconnected hydraulic lines

[kco]

I was always able to deal with pressure build up in disconnected hydraulic lines due to warmer temperatures when reconnecting. But it was different last week when I reconnected the loader lines. The curl lines went on fairly easily. But there was no way I could release pressure on the arm lines. I finally resolved it by using a plastic dead blow hammer which gave me a hydraulic oil shower. Now I know next time to cover it with a rag! But I was surprised at how much pressure was built up and the amount of oil released.

I'm thinking one way around this would be to place a female quick connector on one hose of each disconnected pair to prevent pressure build up, and wrap a rag around the ends to catch the oil and keep out dirt.

Is this a good idea or are there other suggestions?

 

[Todd727]

I always put my remotes in the float position before I disconnect. That way, I'm sure there is no residual pressure. The times I forget are when I get a shower the next time.

If you don't have a mallet handy, just press the check ball against the frame to relieve the pressure. Don't forget the rag.

 

[J_J]

You could install a tee and a needle valve to the hose and then attach the QD to the tee for each attachment.

Keep the needle valve closed until you need to release the pressure into a rag, then close the needle valve and connect your hoses.

You could use the needle valve output for a gage also.

 

[namesray]

I was always able to deal with pressure build up in disconnected hydraulic lines due to warmer temperatures when reconnecting. But it was different last week when I reconnected the loader lines. The curl lines went on fairly easily. But there was no way I could release pressure on the arm lines. I finally resolved it by using a plastic dead blow hammer which gave me a hydraulic oil shower. Now I know next time to cover it with a rag! But I was surprised at how much pressure was built up and the amount of oil released.

I'm thinking one way around this would be to place a female quick connector on one hose of each disconnected pair to prevent pressure build up, and wrap a rag around the ends to catch the oil and keep out dirt.

Is this a good idea or are there other suggestions?

i have had issues before and shutting the tractor off and moving the lever or using float does NOT always work. i have done the hammer and shower deal. thought about the dummy coupler idea with a valve for pressure relief, but here is what i do and it has worked so far.

run all the functions of the implement you want to detach back and forth and up and down. keep doing it until the fluid is working through the hoses is warm. only about 2-4 minutes worth of operating in spring temps. (winter might be different) the idea is to get the fluid in those dissconnect hoses warm so if it warms up in sunlight/temps after you unhook it, it only expands to about where it was when you dissconnected the couplers. hense, no pressure build up. i have been doing this lately alot and NO problems since i started doing it this way. also it is still a good idea to shut the tractor off right before you dissconnect the couplers and move the control lever in all directions to eliminate all gravity leak down that might occur while it is setting.

 

[Zebrafive]

I took a clean 5 gallon pail with lid that had hydraulic fluid in it and mounted two female quick couplers to the lid. I used fitting that were male JIC and used bulkhead nuts on the inside of the lid. I use it for my grapple, since ii's what never wants to reconnect. You could put more quick couplers than two. I had olds ones from when I put new on the JD245 loader.

When ever the grapple comes off the two male couplers get hooked up to the bucket.

 

[grsthegreat]

I agree with JJ's idea. It doesnt matter if your in flote or not. as the temp either increases or decreases the hydraulic fluid will expand on either the implement or the tractor. I even have issues with this with my front mounted snow blade and snow blower. when switching between them IN THE WINTER, i still got pressure buildup .

I plan on having manual dump valves set up by next winter

 

[ptgdigger]

In the construction world where I spend a lot of time we plug the attachment hoses together as soon as we release them, great way to keep them clean and pressure neutral. Machine end solutions vary by machine , backhoe and excavator dipper lines are notoriously hard to connect and always near the dirt so we make up a jumper hose with a m/f and just loop the circuit.


I notice in the tractor world they often don't use 1 male/female reversed set for each function on the QD loaders, a real drawback as it eliminates the easiest answer to the problem.

Ray

 

[phiferpharm]

In the construction world where I spend a lot of time we plug the attachment hoses together as soon as we release them, great way to keep them clean and pressure neutral. Machine end solutions vary by machine , backhoe and excavator dipper lines are notoriously hard to connect and always near the dirt so we make up a jumper hose with a m/f and just loop the circuit.


I notice in the tractor world they often don't use 1 male/female reversed set for each function on the QD loaders, a real drawback as it eliminates the easiest answer to the problem.

Ray

Thats a good idea for my grapple hoses. Thanks:thumbsup:

 

[CJONE]

When I disconnect from my grapple I will bleed some oil off the line so air gets in the lines then I connect them together. Air will compress and not build up too much pressure allowing you to disconnect the couplers and venting the pressure. CJ

 

[ray66v]

There are special connect under pressure QD's that solve this problem.

http://www.farmandfleet.com/products/037740-1_2_connect_under_pressure_hyd_coupler.html