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  1. #1
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    Dec 2010
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    36
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    Mid-Willamette Valley Oregon
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    Kubota L4740, MF65, Gehl 4610

    Default Grand L4740 hydraulic fluid leak. Ideas?

    I have a 2008 Grand L4740 with just over 600 hours. Recently I've noticed hydraulic fluid dripping from the toggle drain at the bottom of the clutch housing when put my tractor away after working it hard. It's not a lot of volume but a pretty steady drip for a while then it stops. I've checked the level and if anything it seems to be a little above the mark. I'm wondering if it is slightly overfilled and leaks out when the oil gets thoroughly warmed up and expands. I haven't noticed the leak when using the tractor for small jobs only when I use it for several hours at a time.

    Do any of you know how hydraulic fluid might get into the clutch housing? I've never split this tractor and don't really know what the possible paths for a leak are. Other than the leaks everything seem to work fine.. I haven't noticed any issues at all.

    Thanks!

  2. #2
    Veteran Member dstig1's Avatar
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    Apr 2010
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    2,265
    Location
    W Wisc
    Tractor
    Kubota L5240 HSTC, (Kubota L3130 HST - sold)

    Default Re: Grand L4740 hydraulic fluid leak. Ideas?

    You SURE it's hydraulic fluid and not water? If we are talking about the same thing, it is meant to remove water/condensation....
    -Dave

    "Being a pessimist is great. You can't lose. Either you end up being right...or you are pleasantly surprised."

    L5240HST, QA, 824 Loader, 48" Forks, 48" Grapple, rear blade, box blade, landscape rake, Ancient Farmi Skidding winch
    Trailer - 10k/16' twin axle w/elec brakes
    2005 F250 5.4V8(3V) 3.73/4wd tow vehicle

  3. #3
    Veteran Member David_Kb7uns's Avatar
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    Aug 2005
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    1,143
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    Willamette Valley Oregon
    Tractor
    Kubota X 4

    Default Re: Grand L4740 hydraulic fluid leak. Ideas?

    You did not say what type of transmission you have, FST, GST or HST. if it is a HST then from looking at the L3130-L5030 service book (think it should be similar for the 40 series) there is a HST charge pump on the input shaft before it goes into the HST pump/motor section and then into the gear section, whatever it is the sources of hydraulic fluid are few and need to be looked at.

    Where are you at? out here by Foster Lake

    David Kb7uns
    Grand L3130GST LA723 Loader, ATI grapple, ATI grapple bucket, WR Long front remote, Kubota rear remotes, Bradco 408 Backhoe with thumb, 60"KK brush hog, 60" RM Finish Mower, Speeco Post Auger, 72" KK rear blade, 60" box blade
    BX2230 LA211, RCK60, GCK60 Bagger,42"Land Pride Tiller, XB BB, XB RB, rake, Fimco 3PT sprayer
    G2160 RCK60 Mower
    RTV1100 Orange, Work Lights, Front Rear Winch,Rear Screen, High Mount air cleaner, water seperator
    2010 Polaris RZR 800 S
    2007 CAN AM Outlander 800 LTD

  4. #4
    Veteran Member
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    Sep 2007
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    2,141
    Location
    Doniphan, Mo.
    Tractor
    Kubota L4240, B7800 & BX2660

    Default Re: Grand L4740 hydraulic fluid leak. Ideas?

    It's the input shaft seal. I had mine leak and fixed under warranty, that didn't last long. I split the tractor and found the housing wasn't tighten down right also the seal seemed to fit loose. I got a new seal and housing, the seal I got was a different color and seem to fit better but had the same part #. So after a new seal, gasket and housing has been fine for about 2 or 3 years now. Make sure you tighten the housing nice and even. The housing should of had one more place for a bolt and you well see why when you get there.

  5. #5
    Member
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    Dec 2010
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    36
    Location
    Mid-Willamette Valley Oregon
    Tractor
    Kubota L4740, MF65, Gehl 4610

    Default

    Quote Originally Posted by dstig1 View Post
    You SURE it's hydraulic fluid and not water? If we are talking about the same thing, it is meant to remove water/condensation....
    yeah,unfortunately it's hydraulic fluid, but you are right normally I wouldn't expect anything but water out of that fitting.

  6. #6
    Member
    Join Date
    Dec 2010
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    36
    Location
    Mid-Willamette Valley Oregon
    Tractor
    Kubota L4740, MF65, Gehl 4610

    Default

    Quote Originally Posted by David_Kb7uns View Post
    You did not say what type of transmission you have, FST, GST or HST. if it is a HST then from looking at the L3130-L5030 service book (think it should be similar for the 40 series) there is a HST charge pump on the input shaft before it goes into the HST pump/motor section and then into the gear section, whatever it is the sources of hydraulic fluid are few and need to be looked at. Where are you at? out here by Foster Lake David Kb7uns
    Sorry, I should have said, it's an HST model.
    I'm south of Corvallis near the airport.

  7. #7
    Member
    Join Date
    Dec 2010
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    Location
    Mid-Willamette Valley Oregon
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    Kubota L4740, MF65, Gehl 4610

    Default

    Quote Originally Posted by Leejohn View Post
    It's the input shaft seal. I had mine leak and fixed under warranty, that didn't last long. I split the tractor and found the housing wasn't tighten down right also the seal seemed to fit loose. I got a new seal and housing, the seal I got was a different color and seem to fit better but had the same part #. So after a new seal, gasket and housing has been fine for about 2 or 3 years now. Make sure you tighten the housing nice and even. The housing should of had one more place for a bolt and you well see why when you get there.
    You have confirmed my worst fears... How bad is it to split this tractor. I'm fairly handy but I've never split one.. Should I attempt it or take it to a dealer?

  8. #8
    Gold Member RedNeckGeek's Avatar
    Join Date
    Jan 2011
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    441
    Location
    Butte County, California
    Tractor
    Kubota L3240D HST, RTV900

    Default Re: Grand L4740 hydraulic fluid leak. Ideas?

    I had the same problem with my L3240 when I got it, used. The tractor was long out of warranty, and it would have been several thousand dollars for the repair at the dealer. I was able to talk to the mechanic there, who walked me through the repair and showed me the special frame/fixture they use to keep the two halves of the tractor lined up while they are apart. He was quick to point out that the same thing could be achieved by using a rolling floor jack to support the back of the front half and just rolling it forward until enough space is created to get in there and replace the seal. If I recall correctly, there is a paper gasket between the front and back half castings, and the seal on the transmission itself. All were special order parts at my dealership (pretty much any kubota part is special order there), so I also ordered one of anything else I thought could be leaking so I'd have it on hand when I got everything apart. Most of the work came from just getting all the parts above the actual tractor frame off, like the deck and such. All that was pretty clearly spelled out in the Kubota shop manual (mine came from kellerkubota.com). I'm not a professional mechanic, but I do have a willingness to read and follow directions, a lot of hand and power tools, and I'm retired so I have more time than money. I used a come a long hanging from an eye bolt in the ceiling of the garage to pull the deck. It wasn't heavy but it was awkward, and more than I could handle by myself. If you have a cab on your tractor that could be an issue. I didn't need any special tools and I only ran into one problem. The Kubota manual doesn't mention it, but there's a steel hydraulic line that runs through a hole in the side of the cases, and that line needs to come off before you try to split the tractor. If you don't know that, you can still split it with a porta-power, but then you'll end up replacing that line. DAMHIKT. That may be the case for your tractor, or it may not, but just keep an eye out if the two halves seem stuck after you think you have all the bolts out.

    If this turns out to be a known issue with your tractor (check the forum here) you could ask the dealer for "good will" toward some of the cost of repair. I used that strategy when the FEL mounts broke repeatedly on my tractor after finding that newer versions of the same mounts had been redesigned. It was like pulling teeth, but if you are firm but polite, you might save a lot of money.

    However it turns out, good luck!

  9. #9
    Super Star Member
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    Mar 2009
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    16,716
    Location
    Missouri
    Tractor
    Kubota, John Deere, Case, Massey Ferguson, Ford

    Default Re: Grand L4740 hydraulic fluid leak. Ideas?

    Same thing happened to my L5740 at 150 hours and it was replaced under warranty. The WSM calls for removing the cab, but the mechanics were able to replace it without doing that.
    Thread on helpful tractor abbreviations: http://www.tractorbynet.com/forums/o...-acronyms.html

  10. #10
    Member
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    Dec 2010
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    Location
    Mid-Willamette Valley Oregon
    Tractor
    Kubota L4740, MF65, Gehl 4610

    Default Re: Grand L4740 hydraulic fluid leak. Ideas?

    Thanks, Scot! I think I'll stop by the dealer and find out if they are willing to work with me. If not, I may embark on a new adventure! Thanks for the info!

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