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  1. #1
    New Member
    Join Date
    Nov 2012
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    3
    Location
    Ossining, NY
    Tractor
    John Deere 3720

    Default Can't disconnect JD grapple lines

    Hi all. This is my first post... I have a new JD 3720 with a grapple. The grapple works great, but I cannot get one of the lines disconnected. I'm afraid to try and force it with channel locks because I don't know if it is under pressure. I tried pushing in the nipple on the line that does disconnect to bleed a little fluid. I tried turning the key on (not starting it) turning on the electric diverter and playing with the buttons to relieve pressure. Any ideas? I have a delivery coming on Monday morning and need to get my pallet forks on!

    --Jim

  2. #2
    Advertiser kennyd's Avatar
    Join Date
    Jul 2003
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    11,870
    Location
    Westminster, MD
    Tractor
    John Deere 4110, 455

    Default Re: Can't disconnect JD grapple lines

    Welcome. Turn the engine OFF, then turn the key ON so you have power to the 3rd SCV solenoid, and then move the joystick around and operate the button, that should release the pressure.
    KennyD
    www.boltonhooks.com



    Bolt On Grab Hooks, Weld On Grab Hooks, Specialty Chain Accessories, Specialty Hydraulic Components.

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  3. #3
    New Member
    Join Date
    Nov 2012
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    3
    Location
    Ossining, NY
    Tractor
    John Deere 3720

    Default Re: Can't disconnect JD grapple lines

    Hi. Thanks for the quick reply. I have tried this... Perhaps the collar is just stuck (it will not rotate or release)b

    --Jim

  4. #4
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
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    17,358
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Can't disconnect JD grapple lines

    Some QD's have a locking collar.

    There is usually not a problem disconnecting QD's.

    If the sleeve will not turn, or push/pull, you may have a defective QD.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  5. #5
    Veteran Member dstig1's Avatar
    Join Date
    Apr 2010
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    2,216
    Location
    W Wisc
    Tractor
    Kubota L5240 HSTC, (Kubota L3130 HST - sold)

    Default Re: Can't disconnect JD grapple lines

    Mine has a small ball bearing that matches up to a cutout in the pull sleeve. If they are not lined up, it will not let the sleeve slide far enough to release.
    -Dave

    "Being a pessimist is great. You can't lose. Either you end up being right...or you are pleasantly surprised."

    L5240HST, QA, 824 Loader, 48" Forks, 48" Grapple, rear blade, box blade, landscape rake, Ancient Farmi Skidding winch
    Trailer - 10k/16' twin axle w/elec brakes
    2005 F250 5.4V8(3V) 3.73/4wd tow vehicle

  6. #6
    Gold Member El Wood's Avatar
    Join Date
    Apr 2012
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    273
    Location
    Michigan
    Tractor
    JD 3320

    Default Re: Can't disconnect JD grapple lines

    I have a grapple and had the same problem... There is nothing wrong with your quick connects.

    What I do is go to the rear of the tractor and locate my SCV. I then take a flat head screw driver and place the end just on the collar of the quick connect. I then start tapping the screw driver until I start to seeing the collar moving. Eventually, the hose pops out with some force (along with some oil). I usually wrap a rag around the SVC when I'm doing this. Next, with the hoses in hand, I wrap a rag around the end, covering the nipple. If you push on the nipple, it won't push in because there is still preasure on the hoses. Next, I pick up a hammer and tap the nipple with it. A bunch of oil will start to soak the rag. I usually do this several times. When some of the preasure is relieved, I hold the nipple in with the head of the hammer. I have soaked half a rag a few times doing this. When all the oil is in the rag and out of the hoses, the quick connects pop out and plug in with no problems. Hope this helps!

  7. #7
    New Member
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    Nov 2012
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    3
    Location
    Ossining, NY
    Tractor
    John Deere 3720

    Default Re: Can't disconnect JD grapple lines

    Thanks GreatLakes37! It went down exactly as you described -- problem solved. Tapping collars and nipples does not seem ideal, but nothing else worked.

    --Jim

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