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  1. #1
    Bronze Member gunnner's Avatar
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    Apr 2011
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    GRAHAM CO. N.C.--Elv. 3150'
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    Yanmar 1610 2X4 tractor---Kabota B 2320 4X4 7 Kobelco SK015 Excavator

    Default FINDING A HYDRAULIC LEAK

    Trying to find a hydraulic leak on my Kobelco sk 015 excavator -----leaking pretty good---I calculated the leak costs me .45 cents per hour when using the machine.
    Question: Will it leak just sitting there running OR does something need to be used, such as operating the bucket, tracts, etc..
    I have it up on RR ties at the moment and it does seam to leak just sitting there running.

  2. #2
    Super Member Gary Fowler's Avatar
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    Bismarck Arkansas
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    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: FINDING A HYDRAULIC LEAK

    Could just be some seapage at a union or swage connection. $.45 per hour oil leak is miniscule. At about $10 per gallon, 45 cents per hour is nothing (6 oz). I have seen worn out cylinders leak much more than that.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  3. #3
    Super Star Member J_J's Avatar
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    Sep 2003
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    18,922
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    JACKSONVILLE, FL
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: FINDING A HYDRAULIC LEAK

    Just wipe or clean the cyl, valves and fittings , and look for the leak.


    There are dyes that can be put in the hyd system, and will fluoresce with a black light
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  4. #4
    Platinum Member
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    Feb 2011
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    756
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    Parish NY
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    555DTC Farmall 200

    Default Re: FINDING A HYDRAULIC LEAK

    So does it leak sitting and not running??? It depends where the leak is if you would need to use a function for it to leak. Pressure line to a valve would leak all the time running, pressure line after a valve would only leak if valve opened. That should narrow down where to start looking
    If it was 6oz per running hour I agree not bad at all , but 6oz an hour not running just sitting there would be an issue. As that's a gallon a day. Personally, depending on what it is when you find it would dictate whether to fix it or not. If it was a labor intensive job to fix it, I would let it go. An easy fix such as a line or something that could get worse and fail completely, bite the bullet.

  5. #5
    Bronze Member gunnner's Avatar
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    Apr 2011
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    GRAHAM CO. N.C.--Elv. 3150'
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    Yanmar 1610 2X4 tractor---Kabota B 2320 4X4 7 Kobelco SK015 Excavator

    Default Re: FINDING A HYDRAULIC LEAK

    OK---Found the leak---Seams it only leaked when the tracts are moving-----I raised the machine up off the ground & spun the tracks for a few minutes----sure enough I found the leak. Was a conection on the hydro pump & leaking a steady drip. The conection is not easy to get to---had to use a 7/8 wench---was a tad too big---will go to the auto store & get the correct size tomorrow ( what ever that is ?)

    Now that the leak is stopped the machine seams to have a bit more power/speed going uphill-----Just my imagination OR could a small leak cause loss of power/speed?

    THANKS for Replies

  6. #6
    Elite Member Zebrafive's Avatar
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    South West MI
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    John Deere 2030, John Deere 6415

    Default Re: FINDING A HYDRAULIC LEAK

    Quote Originally Posted by gunnner View Post
    OK---Found the leak---Seams it only leaked when the tracts are moving-----I raised the machine up off the ground & spun the tracks for a few minutes----sure enough I found the leak. Was a conection on the hydro pump & leaking a steady drip. The conection is not easy to get to---had to use a 7/8 wench---was a tad too big---will go to the auto store & get the correct size tomorrow ( what ever that is ?)

    Now that the leak is stopped the machine seams to have a bit more power/speed going uphill-----Just my imagination OR could a small leak cause loss of power/speed?

    THANKS for Replies
    7/8 is a tad too big, 21mm or 22mm is my guess, depending on how big a tad is
    John Deere 2030 JD 245SL Loader
    John Deere 6415 mfwd JD 640SL Loader

  7. #7
    Elite Member
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    Jan 2010
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    Northern, IL
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    Branson 2400H, JD X540

    Default Re: FINDING A HYDRAULIC LEAK

    Quote Originally Posted by gunnner View Post

    Now that the leak is stopped the machine seams to have a bit more power/speed going uphill-----Just my imagination OR could a small leak cause loss of power/speed?

    THANKS for Replies
    A steady drip with the tracks off the ground would be a larger leak with tracks on the ground while under pressure. So yes you could possibly see a change in spped from this leak.
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD X540

  8. #8
    Super Star Member J_J's Avatar
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    JACKSONVILLE, FL
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    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: FINDING A HYDRAULIC LEAK

    If you are leaking at the relief pressure to cause demished operation, you should/will know it.

    That means that some of those GPM's is going somewhere else.

    It is going through the relief valve or leaking on the ground.

    The flow could also be bypassng the hyd motor if worn, causing poor operation.
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  9. #9
    Bronze Member gunnner's Avatar
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    Yanmar 1610 2X4 tractor---Kabota B 2320 4X4 7 Kobelco SK015 Excavator

    Thumbs up Re: FINDING A HYDRAULIC LEAK

    Aaaaaah ----- So it was not my imagination bout the speed ----

    BTW---A tad turned out to be .23mm ----( I bought a 22mm wench today---fits good )

    THANKS for all the informative replies

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