Pressure on Hyd. couplers

[DanD78]

I have a JD 3320 and a Frountier 4in1 bucket. The problem I am having is when I go to attach the hoses on the bucket the lines on the bucket have so much pressure on them that I can't attach the couplers with out bleeding the cylinders.

I usually shut the engine off and work the hydraulic lever several times and have even left it in the float position while the hoses are being uncoupled. Even if the bucket is off for only a day the lines will build enough pressure to where you can't couple them up. I always leave the bucket closed when unhooked and it does sit outside in the sun.

Any other ideas?
Dan

 

[gary_dsc]

When you park it in the sun, the fluid heats up and expands making the internal pressure increase. Best thing you can do is park it inside or in the shade. Alternatively, covering it with a light colored tarp might help some.

 

[kennyd]

This is a very common problem...especially when stuff sit's outside in the sun. The quickest way to relieve the pressure is to cover the male QD with a rag and press it against the bucket or loader frame, that will depress the poppet to relieve to pressure. It's not a glamorous approach but it is effective. If there is so much pressure that you cannot depress the poppet the way I describe, then you will have to use two wrenches to loosen the QD from the hose.

 

[gary_dsc]

Btw, make sure you don't get hydraulic fluid in your eyes when you releive the pressure.

 

[DanD78]

The quickest way to relieve the pressure is to cover the male QD with a rag and press it against the bucket or loader frame, that will depress the poppet to relieve to pressure. It's not a glamorous approach but it is effective. If there is so much pressure that you cannot depress the poppet the way I describe, then you will have to use two wrenches to loosen the QD from the hose.[/QUOTE]

This is the procedure I use now but I still end up with pressure on the female coupler and have to bleed it off as well. I don't like sticking things in to the coupler that would damage the O ring. I guess I will stick with cracking the hoses loose. Soon it will be cooler out and the problem might go away.

I have had the same problem even when I store the bucket in the shed while off the tractor.

I just had another thought. I will try hooking the ends of hoses in to each other while in storage and see what happens. At least talking about it got the wheels turning.

Dan

 

[jenkinsph]

Another easy way is to wrap a clean rag over the coupler ends and tap the ball end with a hammer. Hit it just hard enough to release the ball and make sure the rag is there to cushion it. This has always worked for me.


Steve

 

[jdbower]

I use silver tarps over my stuff when it has to sit outside. Not only does this keep the heat down in the sun (minimizing the pressure issues) but it also saves the rubber parts from UV damage.

 

[ctlguy]

The best method I have found is that when finished with the attatchment shut down the tractor and run hyd lever to releave pressure before you disconnect. After you disconnect, plug the alternate tips back into each other, repeat the releaving of machine pressure with unit off when ready to hook back up and life will be easier. Is not perfect but works well temperature change will always be a problem and there really isn't enough room on compact tractors to use the "under pressure" style couplers.

 

[SPYDERLK]

Right after you disconnect depress the poppet on the implement lines and bleed a teaspoon or so of oil from each into a catch container. This will leave room in the lines and expansion will not build pressure.
larry

 

[Kamik]

Hi Kenny and Larry,

I experienced the same problem today with my 200CX loader. Took it off 3 weeks ago to have the dealer mount the new 54" snowblower and today one hose had too much pressure to re-connect.

Couldn't depress the poppet to release the pressure so used two wrenches to loosen the QD from the hose. Allowed less than 1/2 a teaspoon to flow out and then re-tightened. Viola!

Later this afternoon after I moved the loader to storage for the winter I released a small amount of oil from each of the hoses so come spring it'll go right back on.

Thanks for your great advice!

Kamik