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  1. #1
    Silver Member
    Join Date
    Oct 2010
    Posts
    185
    Location
    Central Texas

    Default Very slow loader bucket curl on a 3520 with 300X

    Hi Folks,

    I need to consult with the collective wisdom of the TBN community on an issue I'm having with my 2005 JD 3520 with 527 hours and a 300X loader on it.

    The issue is that the loader bucket is curling very (extremely) slow now. It is very slow in both curling up and curling down, and I must apply lots of pressure on the loader control lever to get the bucket to move at all; almost to the point of bending the actual lever.

    The 3 point and the loader lift cylinders work just fine.

    Here's what I've done to troubleshoot the issue:

    - Confirmed the correct amount of hydraulic fluid
    - Disconnected and reconnected the hydraulic line couplers
    - Inspected the hydraulic hoses and connectors for leaks
    - Confirmed that the SCV lock lever is in the unlocked position
    - Tested the bucket curl at various engine RPMs including PTO speed
    - Greased all loader connections

    The 3520 manual suggests that the suction side filter should be replaced or to check for water if the hydraulic performance is poor. Since the 3 point and the loader lift cylinders work fine, I'm not sure that either of these are the issue. Plus, the hydraulic filter was replaced at 400 hours.

    Anyone have any suggestions on this?

    Much appreciated!

    - Spindifferent

  2. #2
    Silver Member
    Join Date
    Aug 2008
    Posts
    183
    Location
    Pacific NW
    Tractor
    John Deere 3320 John Deere X739

    Default Re: Very slow loader bucket curl on a 3520 with 300X

    How about switching the hoses at the hydraulic connectors to see if the problem is in loader side of the disconnects or the tractor side.

  3. #3
    Platinum Member
    Join Date
    Jul 2012
    Posts
    868
    Location
    Southeast Minnesota
    Tractor
    JD 4720, JD X748SE, JD 997, Farmall "B"

    Default Re: Very slow loader bucket curl on a 3520 with 300X

    Does the tractor seem labored when you are activating the curl? Does it sound like the hydraulic relief valve is opening? You can "dead head" the loader lift cylinders to see what it sounds like if you don't know what I mean.
    You should swap your lift and curl hoses around. That will help isolate the probem. You may have a bad quick coupler.

  4. #4
    Platinum Member
    Join Date
    Jul 2012
    Posts
    868
    Location
    Southeast Minnesota
    Tractor
    JD 4720, JD X748SE, JD 997, Farmall "B"

    Default Re: Very slow loader bucket curl on a 3520 with 300X

    Quote Originally Posted by Eric102 View Post
    How about switching the hoses at the hydraulic connectors to see if the problem is in loader side of the disconnects or the tractor side.
    You type faster than me

  5. #5
    Silver Member
    Join Date
    Oct 2010
    Posts
    185
    Location
    Central Texas

    Default Re: Very slow loader bucket curl on a 3520 with 300X

    Thanks Eric and Arlen!

    I did switch the hydraulic hoses between the lift and bucket cylinders, and the slowness moved to the lift, and the bucket worked just fine. This tells me that all the loader cylinders/lines are working fine, and that there is an issue on the tractor with the yellow and/or red hydraulic lines.

    For future reference for anyone who may want to switch the hydraulic hoses between the lift and bucket on a 3520 with 300X, here's what I did:

    Tractor Side - Loader Side
    Yellow - Black
    Red - Green
    Black - Yellow
    Green - Red

    This combination keeps the cylinder rod and head connections inline.

    Thanks for your help in troubleshooting. I guess it's time to make an appointment with the dealer for service.

    - Spindifferent

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