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  1. #1
    New Member
    Join Date
    Sep 2010
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    1
    Tractor
    farmall super c

    Default Single Vs double action

    I have an old superior loader that uses single action cylinders to lift. Weight of loader lowers itself.

    I need to replace the cylinder but can only match with a double acting cylinder.

    Can I use the double acting cylinder by plugging the top hole?

    Adding a return hose would be difficult.

    Also, Any thoughts on a seal kit or replacement cylinder ?

    pin to pin retracted length = about 40 inches
    stroke = 30 inches
    Rod = 1.75 inch diameter
    bore appears to be about same as rod diameter

    thanks

  2. #2
    Member
    Join Date
    Mar 2010
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    29
    Location
    Fox Lake, WI
    Tractor
    John Deere 3720

    Default Re: Single Vs double action

    A double acting cylinder will work but you can't plug the unused hole. You would have to put a vent on it to let the air out and keep dirt out.
    3720 with 300 CX FEL. 61" with teeth.
    72" Medium Duty Frontier Box Blade
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    JD 740 w/ 47" snow-blower
    42" Hydraulic Tiller; 48" Center Blade
    54" Front Blade; 62" Mower deck

    JD 110 w; 48" deck; snow-blower; front blade.


    13/32 JD Snow blower 8/32 Snow blower.
    5 HP Rototiller

  3. #3
    Platinum Member Craig Clayton's Avatar
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    May 2009
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    863
    Location
    Uxbridge Ontario Canada
    Tractor
    L2250 Kubota

    Default Re: Single Vs double action

    That is it in a nutshell, on the vent look for a fitting that filters the air so you do not suck in micro dust.
    Craig Clayton

  4. #4
    Elite Member wdchyd's Avatar
    Join Date
    Apr 2010
    Posts
    2,677
    Location
    Hooksett, NH
    Tractor
    Kubota B2320

    Default Re: Single Vs double action

    I like to add what I call a "Pi$$ Tube" on the unused port on the D/A hyd cyl....

    Basically adding a brass 90 deg fitting with hose barb and low pressure hose (rubber/poly or vinyl) and connect to a return line to tank....

    It accomplishes a few things.........allows adding oil for lubrication on the other side of the piston head internally (helps big time for cyl longevity)....keeps dirt/grit/water contamination out.......and if the piston head does leak slightly it will bypass any extra oil out back to the reservoir when extending the cyls all the way out......

    Your tractor will still function as a single acting hyd cyl and it won't change the operation......
    2010 Kubota B2320 FEL & BH65
    If it ain't fixed don't broke it!

    http://www.tractorbynet.com/content/...-month-wdchyd/

  5. #5
    Elite Member wdchyd's Avatar
    Join Date
    Apr 2010
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    2,677
    Location
    Hooksett, NH
    Tractor
    Kubota B2320

    Default Re: Single Vs double action

    Also, should you decide to change the control valve in the future you'll already be ready for the changeover to double acting (except for changing to high pressure hoses)........
    2010 Kubota B2320 FEL & BH65
    If it ain't fixed don't broke it!

    http://www.tractorbynet.com/content/...-month-wdchyd/

  6. #6
    Veteran Member
    Join Date
    Apr 2009
    Posts
    1,023
    Location
    Port Angeles WA

    Default Re: Single Vs double action

    Quote Originally Posted by roger540 View Post
    I have an old superior loader that uses single action cylinders to lift. Weight of loader lowers itself.

    I need to replace the cylinder but can only match with a double acting cylinder.

    Can I use the double acting cylinder by plugging the top hole?

    Adding a return hose would be difficult.

    Also, Any thoughts on a seal kit or replacement cylinder ?

    pin to pin retracted length = about 40 inches
    stroke = 30 inches
    Rod = 1.75 inch diameter
    bore appears to be about same as rod diameter

    thanks
    There are two ways to use the term Single Action cylinder, SA.


    If you have one with no piston, just a rod (see my "true SA cylinder" on the picture), Then there must be external leakage to call the cylinder bad for dropping down the load. If no external leakage, cylinder good!!
    Then you have to check the internal leakage in the control valve. There maight be a port related pressure relief valve that leaks. I doubt valve spool would leak (They last "forever" if oil is clean), unless it is not properly centered in neutral.

    You can use a DA cylinder, just plumb the rod side straight to return line or to tank.....thats a very common way to do it on some mobile crane equipment

  7. #7
    Veteran Member
    Join Date
    Apr 2009
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    1,023
    Location
    Port Angeles WA

    Default Re: Single Vs double action

    Quote Originally Posted by wdchyd View Post
    I like to add what I call a "Pi$$ Tube" on the unused port on the D/A hyd cyl....

    Basically adding a brass 90 deg fitting with hose barb and low pressure hose (rubber/poly or vinyl) and connect to a return line to tank....


    It accomplishes a few things.........allows adding oil for lubrication on the other side of the piston head internally (helps big time for cyl longevity)....keeps dirt/grit/water contamination out.......and if the piston head does leak slightly it will bypass any extra oil out back to the reservoir when extending the cyls all the way out......

    Your tractor will still function as a single acting hyd cyl and it won't change the operation......
    +1

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