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  1. #1
    Member
    Join Date
    Nov 2004
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    45
    Location
    Western Iowa
    Tractor
    AGCO ST34 A

    Default FEL Hydraulic question

    Since we don't warrant our own section, I'll jump in here with the MF guys. I've got an Agco ST34, which is a twin to your 1533's, and the loader cylinders seem to be acting up. With the bucket off the ground and partially curled, I can actually get the bucket to curl 6" to 8" buy lifting up on the cutting edge by hand. The cylinders all show a little leakage, but nothing really bad. Am I getting air in the cylinders possibly?

  2. #2
    New Member
    Join Date
    Sep 2007
    Posts
    15

    Default Re: FEL Hydraulic question

    That sounds like air in a cylinder to me. I had a leaky cylinder on a New Idea 512 and if I didn't swing it all the way to the left and then all the way back to the right to fill the cylinderwith fluid, the haybine would just go were ever it felt like going. That wasn't really a bad leak either, but air is thinner than hydraulic fluid and it doesn't take much of a leak to let alot of air in

  3. #3
    Super Member JerryG's Avatar
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    Apr 2000
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    7,201
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: FEL Hydraulic question

    When you try to curl the bucket the same distance with the joystick, is there a long lag in the time that it takes to start moving or does it move pretty quick?

  4. #4
    Member
    Join Date
    Nov 2004
    Posts
    45
    Location
    Western Iowa
    Tractor
    AGCO ST34 A

    Default Re: FEL Hydraulic question

    The only time I get much delay is when I fully extend the bucket cylinders, and then try to retract them. After its cycled a few times it gets better, which makes me think air might be to blame. Makes it really hard to do much digging when the bucket is essentially in float since I can't hold the cutting edge solid.

  5. #5
    Veteran Member rback33's Avatar
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    May 2003
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    1,446
    Location
    Kansas

    Default Re: FEL Hydraulic question

    It does it when you dump a load the worst right? It's cavitation. The fluid leaves the rod end of the cylinder faster than the fluid can come in the base end. If you operate at a higher RPM you will see less of this, as the pump is moving more fluid. If your valve has a regen function you can eliminate it all together. If you do a search on cavitation, you will learn all you need to know.

  6. #6
    Elite Member
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    MtnViewRanch's Avatar
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    Mar 2005
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    4000\' mountains of Southern California
    Tractor
    Mahindra 7520, Mahindra 3215HST, Case 580 extendahoe, Case 310 dozer, Parsons trencher, Cat D6,

    Default Re: FEL Hydraulic question

    Quote Originally Posted by rback33
    It does it when you dump a load the worst right? It's cavitation. The fluid leaves the rod end of the cylinder faster than the fluid can come in the base end. If you operate at a higher RPM you will see less of this, as the pump is moving more fluid. If your valve has a regen function you can eliminate it all together. If you do a search on cavitation, you will learn all you need to know.
    Heeeeey, 1000 posts, congratulations.
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    Top and Tilt Kits by Fit Rite Hydraulics

  7. #7
    Gold Member jeepcj7's Avatar
    Join Date
    Oct 2004
    Posts
    306

    Default Re: FEL Hydraulic question

    I installed a one way restrictor from the MF dealer that stopped that from happening. It didn't slow down the time to dump or curl the bucket, but it did get rid of the hesitation. p/n was was 4269830M1 and a couple fittings. Put the restrictor on the top steel line on the side of the loader line and make sure the arrow on hte restrictor is pointing forward.

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