New Owner of 2011 JD 4720 - slow loader funciton
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    New Owner of 2011 JD 4720 - slow loader funciton

    Hello to the forum!! I'm a long time John Deere user - have had a 4210 for 10 years without a single issue. I've used it for more than I should have more than once, and I just recently bought a 2011 4720 - more horsepower and loader reach.

    As an ehyrdo - the tractor moves great, very responsive. But, lift on the loader bucket is very slow. All other functions with the bucket seem to be at normal speed, but just lift is very slow. In fact, at idle, the loader won't lift at all. As far as 3pt hitch, seems also to be OK.

    However, the more throttle, the more loader lift will function. No matter what, still slow. And the power of lift at 2000 RPM seems plenty strong - just slow.

    I've serviced tractor, new filters, oil. Suction screen wasn't very dirty - cleaned and re-installed.

    LoadMatch appears to be "On".

    I'm hoping for some suggestions - something else I can evaluate? All of my evaluation of "slow" is based on my 4210. It is twice as fast in function. Is my evaluation just wrong?

    Thanks in advance!
    Tim

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    Captain Hook Kennyd's Avatar
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    I'd suspect a bad male or female QD since it just seems to be one function that is affected, or possibly the seals in one of the cylinders. Does the engine labor when trying to lift?

    You could swap the hoses to switch the lift/lower/ and dump/curl functions and see if the problem stays on the lift side or moves to the curl side to help narrow it down.
    Kenny

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    Superglidesport's Avatar
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    I agree with Kenny's assessment. When reading your post I was also thinking about the possibility of a partially restricted poppet in either side of the hydraulic quick disconnect fittings. You might want to remove and reconnect all of the quick disconnects as a first step in the diagnostic process.
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    Quote Originally Posted by Kennyd View Post



    I'd suspect a bad male or female QD since it just seems to be one function that is affected, or possibly the seals in one of the cylinders. Does the engine labor when trying to lift?

    You could swap the hoses to switch the lift/lower/ and dump/curl functions and see if the problem stays on the lift side or moves to the curl side to help narrow it down.
    Quote Originally Posted by Superglidesport View Post
    I agree with Kenny's assessment. When reading your post I was also thinking about the possibility of a partially restricted poppet in either side of the hydraulic quick disconnect fittings. You might want to remove and reconnect all of the quick disconnects as a first step in the diagnostic process.
    Good idea and a cheap, easy place to start looking.
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    johncanfield's Avatar
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    My loader is slow with the engine at idle but at 1500 RPM, it should operate very quickly with more movement of the joystick. I've not seen much engine RPM difference with LoadMatch on or off but maybe I haven't met all of the requirements for it to work.
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    Followup

    Hi everyone (I'm not sure what happened to my first reply - I can't seem to find it!!) Anyway...

    Thanks for the quick response from everyone. Here is what I tried:

    First I disconnected every quick connect, and reconnected them several times. They were sticky at first, then began to behave more normally.

    Upon further inspection, I did find one of the metal "cross-over" lines was dented, but I confirmed it was only for the dump/curl function.

    I moved the raise/lower hoses for the loader to all combinations on the quick connectors. I did not get any difference in behavior. Still slow in performance. At lowest idle, the loader bucket will not lift more than 4 inches from the ground.

    I suppose a next step would be to disconnect the lift cylinders from the frame to measure their timing independently? Will that tell me much if they are not under load? I suppose that the one female connector on the hose could be bad? (I can easily depress the tip with my finger now when the hydraulic pressure is relieved)

    Other thoughts?

    Thanks in advance - again!?
    Tim

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    If you have the 3rd function on you loader check the T handle isn’t cracked open. Every time I have an issue with my loader it’s because I’ve forgotten to close this after I’ve changed an attachment.
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    Sparkhead, I'm not sure what you mean by the T-handle? Being cracked open? I do have a set of Quick Connects on the rear of the tractor, but I can find no apparent valve or anything that might be open. Those metal lines go right under valve on right side of tractor.

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    Not sure if all of the Deere range has it but mine has a “tap” on the top of the 3rd function block at the back of the tractor which I use to relieve pressure in the lines so I can change attachments. Maybe this is only a feature on the e-hydro versions on the 3rd function. The tap has a tee type handle. Is there anything like this in your hydraulic system?
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    Captain Hook Kennyd's Avatar
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    Quote Originally Posted by Sparkhead View Post
    Not sure if all of the Deere range has it but mine has a “tap” on the top of the 3rd function block at the back of the tractor which I use to relieve pressure in the lines so I can change attachments. Maybe this is only a feature on the e-hydro versions on the 3rd function. The tap has a tee type handle. Is there anything like this in your hydraulic system?
    That pressure relief is only on the 3rd function solenoid valve, it will have nothing to do with the just the lift circuit operating slow.

    Click image for larger version. 

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    Kenny

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