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  1. #1
    Bronze Member
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    Dec 2006
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    55

    Default hydraulics for adding QA backhoe or auger

    I have a L3540 which is a great tractor. I use the quick attach bucket and pallet forks quite often (switching between the two that is). I would like the ability to rent equipment for a bobcat-it will (should) attach via my FEL's QA but I'll need hydraulics to operate the attachment.

    has anyone done this or can provide info-even search terms would be helpful. My L3540 has 3 slots for add on remotes near the right rear fender and I see 3 electrical connections.

    question-does the 3540 have enough flow to supply common attachments?

    thanks guys!

  2. #2
    Super Star Member
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    Mar 2008
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    10,202
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    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: hydraulics for adding QA backhoe or auger

    Quote Originally Posted by 72chevy4x4 View Post
    question-does the 3540 have enough flow to supply common attachments?
    you will need low flow attachments, the high-flow ones take ~30GPM to run, low flow ones are in the 8-12GPM range which your tractor should be able to put out.

    Aaron Z
    Last edited by aczlan; 08-22-2008 at 10:16 PM. Reason: spelling
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
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  3. #3
    Veteran Member
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    Jun 2003
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    1,649
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    Northern, New York
    Tractor
    Kubota L3830 03: RTV 900

    Default Re: hydraulics for adding QA backhoe or auger

    Your tractor put out about 9 GPM.
    M-5040 w/cab, 05 RTV 900, Where the maple sap flows

  4. #4
    Elite Member
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    Jul 2006
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    3,015
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    midwest
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    JD 4520, Toolcat 5610, Bobcat S300, Case-IH 125 Pro, Case-IH 245, IH 1086, IH 806

    Default Re: hydraulics for adding QA backhoe or auger

    Your tractor with the 9 gpm flow rate will do ok with a backhoe. They don't require high flow rates. I previously had a Bradco 611 backhoe on my kubota 3710 and it had about 7gpm and ran a little slow. I use the same backhoe on my Skidsteer (19 gpm) and I have to run it at an idle or the flow is too high.
    I have used a Bobcat auger (model 15) on my prior Kubota and current JD 3720 which has 8 gpm. The auger is a little slow but gets the job down. Much nicer to use the auger on my Skidsteer at half throttle.
    Forget about using anything like a trencher, stump cutter, snowblower etc. These SS attachments need much high flow rates than you can provide. This is one of the reasons I just ordered a Toolcat 5610 was to get the higher flow rates but still has a 3pt on the back.

  5. #5
    Elite Member
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    Jul 2006
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    midwest
    Tractor
    JD 4520, Toolcat 5610, Bobcat S300, Case-IH 125 Pro, Case-IH 245, IH 1086, IH 806

    Default Re: hydraulics for adding QA backhoe or auger

    I have never used a low flow hydraulic auger as designed for the slower flow of tractors. I think I would hate them. I need the higher flow to get more torque. My current Bobcat 15 model auger (max 18 gpm) digs 12" holes nicely at the higher flow rates but still stops occassionally, especially in wet soil. This is at 3000 psi which is higher than most tractors. However, it struggles with 24" and nearly impossible with 36" bits. I just ordered a model 30C auger which has nearly double the torque and can use up to 28 gpm. The only good way to get great torque is higher pressure and higher flow rates.

  6. #6
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
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    4,592
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: hydraulics for adding QA backhoe or auger

    Quote Originally Posted by radman1 View Post
    I have never used a low flow hydraulic auger as designed for the slower flow of tractors. I think I would hate them. I need the higher flow to get more torque.
    The torque delivered to your auger bit does relate directly to hydraulic
    pressure, and to gearing, but not hydraulic flow rate. In general, hyd
    motors with larger displacements generate larger torques, but that is
    dependent on internal motor geometry. What you often get with hyd
    PHDs on lower flow tractors is an auger that runs slower, but delivers
    plenty of torque, prob similar to the torque you get on hi-flow skidsteer PHDs.

    As an example, the White series 300 hyd motor on my PHD is 7.7
    c.i./rev and it can handle up to 20GPM. At the 8+ GPM my tractor puts
    out, it only turns at 240RPM and puts out 212 ft-lbs of torque, the same
    torque it puts out at 20GPM. For my PHD, the gearbox increases the
    torque 3.18x, to 673 ft-lbs, while reducing its speed to only 75RPM.

    That is a lot of torque, and it works well.

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