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  1. #1
    Gold Member 600rider's Avatar
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    union city pa
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    2004 kubota b7510

    Default 3 ph drifts down

    Ok I have lived with this for a couple years so now is the time to fix it! I have a 2004 kubota B7510 HST and the the 3ph drifts down all the time! It doesn't matter if I am driving the tractor or if it is sitting running while I am doing something else. doesn't matter if it is at idle or full throttle. I have even been going down the road and tried to lock it in the up position with the knob in front of the seat. I am thinking it might be a seal on the lift cylinder. Any thoughts?? Thanks, Ken.

  2. #2
    Veteran Member
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    Fanning Springs, Gilchirst County, North-Central Florida
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    Kubota Tractor Loader L3560 HST 37-hp / 5,400 pounds

    Default Re: 3 ph drifts down

    None of the 'B' series has position control. Without position control a SLOW drift down of the bottom links is normal.

    The only palliative is check chains, such as Zerco, most commonly used with rotary cutters to assure down return to specific height. Zerco check chains work "fine".

    In Photo #2 rotary cutter is UP, chains are slack.

    In Photo #3 rotary cutter is DOWN, chains are taut. DOWN adjustment is repeatable and will hold as many years as the chains last.

    MORE INFORMATION:

    http://www.tractorbynet.com/forums/k...ck-chains.html
    Attached Thumbnails Attached Thumbnails -img_0494-jpg   -img_0501-jpg   -img_0495-jpg  
    Last edited by jeff9366; 04-19-2013 at 02:11 AM.

  3. #3
    Platinum Member 3v0's Avatar
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    Oklahoma Pan Handle, United States
    Tractor
    Kubota BX2200

    Default Re: 3 ph drifts down

    Quote Originally Posted by jeff9366 View Post
    None of the 'B' series has position control. Without position control a SLOW drift down of the bottom links is normal.
    Is the same true of BX's

  4. #4
    Gold Member 600rider's Avatar
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    2004 kubota b7510

    Default

    I dont remember it doing this when it was new. While I am going down the road with an implement or trailer on the 3 ph it will drop to the bottom quite fast. I dont believe this is what it is supposed to do. I think it should stay put for at least a reasonable amount of time.

  5. #5
    Gold Member 600rider's Avatar
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    2004 kubota b7510

    Default

    It wont even stay up with out anything on the 3 ph!!

  6. #6
    Veteran Member
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    Fanning Springs, Gilchirst County, North-Central Florida
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    Kubota Tractor Loader L3560 HST 37-hp / 5,400 pounds

    Default Re: 3 ph drifts down

    Post #4 + #5: You are correct, this is NOT normal.

    When was the last time you changed your hydraulic fluid and hydraulic system filters?

    If it is a leaking seal or lines your hydraulic fluid will be low.

    How many engine hours on your B7510?

    Has it been stored inside a structure or outside? With a tractor 8+ years old this can make a difference. Fittings can loosen in alternate freezing/thawing conditions leading to tiny leaks, hydraulic hoses deteriorate faster out in the weather.
    Last edited by jeff9366; 04-19-2013 at 09:47 AM.

  7. #7
    Veteran Member
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    Fanning Springs, Gilchirst County, North-Central Florida
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    Kubota Tractor Loader L3560 HST 37-hp / 5,400 pounds

    Default Re: 3 ph drifts down

    Why not post this same enquiry, with all dis-function information consolidated, in the HYDRAULICS Forum?

  8. #8
    Gold Member 600rider's Avatar
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    2004 kubota b7510

    Default Re: 3 ph drifts down

    Jeff9366, The tractor is stored in a heated garage, has about 600hrs. on it, hasn't had the filter or fluid changed since what was recommended after the initial break-in period. None of the lines or seals leak fluid on the ground.
    I was thinking it could be the seal on the lift cylinder so the oil would just bypass and would be internal so no leakage on the ground.

  9. #9
    Elite Member whistlepig's Avatar
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    Preble County, Ohio
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    Kubota B7800 with FEL

    Default Re: 3 ph drifts down

    Is there a knob on your tractor that controls the speed of your three point raising or lowering? If there is, and it is not adjusted correctly, that may be part of the problem.
    I used to do the Hokey Pokey but I turned myself around.

  10. #10
    Platinum Member sd455dan's Avatar
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    North Idaho
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    Ford 3000-Rhino 554,Co-Op ,Honda ,Gilson riding mowers

    Default Re: 3 ph drifts down

    if it is like most tractors, the rockshaft seal if bad- results in your description, but the hydraulic control linkage would cause it to lift back up to the original position if the tractor had position control and the tractor was running..

    When not running the quick lowering is the most common result with a failed rockshaft seal...one more thing a rockshaft seal failure will not affect fluid level, it will just end up in the sump..-rockshaft-seal-replacement-001-jpg -rockshaft-seal-replacement-002-jpgas can be seen in this picture the cylinder that the rockshaft piston slides in is open to the sump, this ones seal had completely disintegrated.
    Replacing the seal and honing the cylinder restored the 3 point lift, to as new operation.
    You can also check your work by using an air compressor and an inexpensive leak down tester as I did, this assures you that the seal is sealing correctly and that it didn't get damaged during installation -rockshaft-leakdown-test-002-jpg besides those rockshaft covers aren't exactly light, and it's no fun taking it apart twice...
    Last edited by sd455dan; 04-20-2013 at 07:01 AM.

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