Bucket with a load drops when first moving joystick
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Thread: Bucket with a load drops when first moving joystick

  1. Top | #1

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    Bucket with a load drops when first moving joystick

    Hi,
    I have a JD 4100 with a 410 loader I purchased used. If I have the loader up with a load in the bucket, and I want to raise it some more, as soon as I move the joystick, the bucket drops until I have moved the stick enough to get the pressure back so it will rise again. It seems there should be a valve of some sort that maintains the pressure. I've never used a loader on any other tractor that does this.
    What seems to be the issue and how do I repair it? Thanks in advance for your advice!
    Glenn
    Last edited by 69Hurst; 12-23-2017 at 06:46 AM.

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    Captain Hook Kennyd's Avatar
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    Welcome to GTT Glenn,
    The part in the valve that keeps it from dropping is called the "load check", this should be part #7 and #8 in the drawing.

    Click image for larger version. 

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    Selective Control Valve

    Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
    1 AM879557 Control Valve 1 Selective
    2 LVU801897 Bolt 3
    3 19M8554 Screw 2 M8 X 65
    4 M800696 Seal 2
    5 CH10569 O-Ring 6
    6 M808050 Plug 2
    7 M808049 Spring 2
    8 M808048 Valve 2
    9 M808052 Gasket 1
    10 M808044 Detent 1
    Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
    11 M808053 Washer 1
    12 R63075 Ball 2
    13 400R Ball 1
    14 M808040 Spring 1
    15 M808043 Clip 1
    16 R127517 Bolt 2
    17 M800676 Bolt 1
    18 CH19915 Washer 3
    19 M808051 Cover 1
    20 M808042 Bolt 1
    Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
    21 M808047 Bolt 1
    22 M800703 Holder 1
    23 M808041 Holder 1
    24 M808046 Stop 1
    25 M808045 Spring 1
    26 M808038 Spring 1
    27 M808039 Holder 1
    28 M800702 Holder 1
    29 CH11436 O-Ring 1
    30 M808034 Plug 3
    Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
    31 M800633 O-Ring 3
    32 M808033 Valve 1 Auxiliary
    33 CH17260 O-Ring 1


    Here is the whole SCV area, #32 is the entire valve:
    Click image for larger version. 

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    rtgt, OxPath, Ray_PA and 3 others like this.
    Kenny

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    Thanks, so these valves are leaking or the springs are bad I assume? Is this uncommon? Replace them and I should be good? Thank you!

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    Captain Hook Kennyd's Avatar
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    Yes it's uncommon. I would replace them-or at the very least remove and inspect to make sure they are not stuck, but I cannot guarantee that will fix your issue.

    Was the valve "used" too or did you already have that on your machine?
    OxPath, Ray_PA and PJR832 like this.
    Kenny

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    It is what was on the tractor when I purchased it, looks to be all original. So maybe stuck, Looks like I have something to keep me busy for a while. Thanks again!

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    I know this is old but just in case someone finds this, when I had this problem I had to rebuild the cylinders.
    The load checks were fine on mine.


    Sent from my SM-G950U using Tapatalk
    pcabe5 and HVACguy like this.

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    The problem ended up being fairly simple. A previous owner had removed the cap for the load check valve and reinstalled the spring and valve backwards (the spring below the valve), which of course renders is useless. So I cleaned the parts up and installed them correctly and it works fine. Thanks for the tips and the parts diagram!
    Glenn
    Kennyd, keane, PJR832 and 1 others like this.

  10. The Following 2 Users Say Thank You to 69Hurst For This Useful Post:

    130Oxbow (01-13-2019), Kennyd (01-12-2019)

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    Captain Hook Kennyd's Avatar
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    Thanks for the update 69, we all appreciate that!
    Kenny

    -John Deere 3720 Deluxe Cab TLB
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    -John Deere 455 w/60" MMM


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    Visit our YouTube Channel

    My Equipment:
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    Artillian 3K Forks, Grapple, Front-Hoe Bucket
    John Deere 455, 60" MMM

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