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  1. #1
    New Member Yanmar Chris's Avatar
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    Feb 2010
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    16
    Location
    Minnesota
    Tractor
    YM 220D 1991 & Ym 240D 1979

    Default Confused... Leaking hydraulic oil

    Hello Everyone , Have a leak and not sure why and how to fix it. It's on a 1979 240D . After running for awhile I have hydraulic fluid leaking out where the gear shifter is and in the back out of a small black hose that looks like it's connected to either a brake housing or the axle.
    It seems like when the gear case gets warm it pushes the fluid out of the shifter and black hose in the back. I've unscrewed the dipstick to check the level and I can hear air being released.
    Is there supposed to be a hose to release this pressure that's possibly clogged ? Any help would be greatly appreciated. Thanks Chris

    Here are some pictures



    Below is a picture of where the fluid comes out of the hose


    Red arrow is the dipstick where air gets released when unscrewed. Green arrow where fluid leaks also.

  2. #2
    Veteran Member
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    Jun 2010
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    1,462
    Location
    Southern California
    Tractor
    International Harvester 284, Yanmar 1401D, Yanmar 240, and others...many others...

    Default Re: Confused... Leaking hydraulic oil

    The vent hose should relieve any built up pressure. I don't recall offhand where my 240D's vent tube(s) are, but the YM2000 has one on top of the rockshaft housing, number 8 in this picture.

    How does the hydraulic fluid look? Is it milky? I would speculate the system is over-filled, and the expansion of the fluid as it warms simply causes it to spill out the vent and boot.

  3. #3
    Super Star Member J_J's Avatar
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    Sep 2003
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    18,923
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    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Confused... Leaking hydraulic oil

    You may have a suction leak and the air bubbles is causing the fluid to expand, and force fluid out any orifice. Heat will expand the fluid also.
    J.J.

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

    Git er done.

  4. #4
    Veteran Member deepNdirt's Avatar
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    Sep 2009
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    2,301
    Location
    Nth East Ga, USA
    Tractor
    yanmar YM-1700

    Default Re: Confused... Leaking hydraulic oil

    what is the oil level when you checked it? I'm sure overfilling of the system could cause this, I see you have both a FEL as well as a back-hoe, the cylinders of these could purge quit a bit of hydraulic fluid back into the reservoir at one time and if system is too full could result in finding its way out, or does the back-hoe have it's own hydraulic pump that runs from the PTO? Incidentally mine use to leek around the shifter boot, I put double zip-tie straps around it, problem solved and as mentioned the vent tube should be at top of the housing, someone may have added the hose in attempt to extend the mess away from the tractor, But it should not have any fluid coming out, do you work the tractor on uneven terrain? perhaps this is when the fluid starts coming out the worst,
    Last edited by deepNdirt; 09-19-2011 at 12:06 PM.

  5. #5
    Elite Member Car Doc's Avatar
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    Mar 2009
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    3,246
    Location
    Kansas
    Tractor
    YM3810D Yanmar

    Default Re: Confused... Leaking hydraulic oil

    I think the vent for the trany is a J shaped pipe under the seat on top of the 3pt cylinder it may be plugged which may explain the pressure in the trany.

    Don't know if that would cause this or not but to me it sounds like its way over filled at the least.
    Yanmar YM3810D, LT duty 3pt hoe, 6' KK2 tiller, 6' KK box blade, 6 1/2' KK disc, 5' Howse bush hog, 5' Howse back blade, 9" Yellow PHD, 3 Husky chain saws 346XP NE, 359, 372XP. 07 HD Heritage Softail, Crack injectors, check compression, take 2 beers and call me. "Hey you didn't build that."

  6. #6
    Super Member California's Avatar
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    Jan 2004
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    7,541
    Location
    Sonoma County
    Tractor
    Yanmar YM240, and now just one YM186D

    Default Re: Confused... Leaking hydraulic oil

    Quote Originally Posted by 284 International View Post
    The vent ... on top of the rockshaft housing, number 8 in this picture.
    And if that hose in your second photo is #49 here - then the seal behind the brake drum, that keeps oil out of the brakes, has blown out. See #62, 63 on the Transmission-Internal page.

  7. #7
    New Member Yanmar Chris's Avatar
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    Feb 2010
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    16
    Location
    Minnesota
    Tractor
    YM 220D 1991 & Ym 240D 1979

    Default Re: Confused... Leaking hydraulic oil

    Thanks everyone for the input. Checked fluid level tonight. Fluid is clear , not milky and not overfilled. The backhoe has it's own pump on the pto. Checked that vent that 284 International put that link up and yes it was under the seat. Looked like an upside down J lol. I put a firm piece of wire in the vent and a whole bunch of dirt and crap came out.
    The tractor was sitting out for years so maybe some insects were making it their home. Put some zip ties around the shifter boot. We'll see if that helps.
    That black hose is what California had put up and it is #49 in that link.
    I don't have the money or time to replace the seal at the moment. I just might put a screw or plug in that hose so I don't loose any more fluid.
    I know I should not do it that way but it's a temp thing.
    I usually use the tractor on level ground and I don't see any fluid coming out of the vent under the seat, it's by the shifter and the hose by the break.
    Next time I run it I'll post up what happens.
    Thanks to you all for the help. It's greatly appreciated

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