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  1. #1
    Silver Member
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    Default Cannot figure out how to return back to tank / resevoir?

    In my continued efforts to add power steering to my Mitsubishi MT180HD, I am now puzzled on where to connect the relief line back to the tank.

    I am attaching a schematic of my tractor hydraulics.

    What make it so puzzling to me is that this tractor is hydrostatic drive so I believe that both the drive system and other hydraulics share the same tank or resevoir.

    I am thinking of attaching to either of the spots highlighted by red circles. This is a line that runs from the filter housing to the left of the drive system.

    Any suggestions?

    Thanks
    Greg
    Attached Thumbnails Attached Thumbnails -hydraulics-jpg  

  2. #2
    Super Star Member J_J's Avatar
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    Sep 2003
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    17,921
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    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Cannot figure out how to return back to tank / resevoir?

    You should be able to tee in to any return hose or pipe going to reservoir.
    Last edited by J_J; 12-15-2010 at 07:39 PM.
    J.J.

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

    Git er done.

  3. #3
    Silver Member
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    172

    Default Re: Cannot figure out how to return back to tank / resevoir?

    The only line going to the tank (That I can see) is the one from the sediment filter at the bottom of the tank. I dont see any lines returning to the top of tht tank. Unless I adapt something to the filler hole and rework the dipstick.

    Can anyone tell from the drawing how the fluid is flowing.

  4. #4
    Silver Member
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    Oct 2006
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    Default Re: Cannot figure out how to return back to tank / resevoir?

    Here is a picture without my little red circles.

    I wonder if the fluid runs through the cooler, then through the center of the filter, then out the side of the filter back to tank. Although I did blow air through this passage and did not see an air come out of the resevoir.

    Greg
    Attached Thumbnails Attached Thumbnails -hydraulics-gif  

  5. #5
    Platinum Member
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    May 2010
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    519

    Default Re: Cannot figure out how to return back to tank / resevoir?

    Quote Originally Posted by gsdavis1 View Post
    In my continued efforts to add power steering to my Mitsubishi MT180HD, I am now puzzled on where to connect the relief line back to the tank.

    I am attaching a schematic of my tractor hydraulics.

    What make it so puzzling to me is that this tractor is hydrostatic drive so I believe that both the drive system and other hydraulics share the same tank or resevoir.

    I am thinking of attaching to either of the spots highlighted by red circles. This is a line that runs from the filter housing to the left of the drive system.

    Any suggestions?

    Thanks
    Greg
    Either of the two points you have marked should work depending on which side your return line will be routed. According to the drawing, that line is the return to the transmission and should have no pressure on it.

  6. #6
    Silver Member
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    Oct 2006
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    172

    Default Re: Cannot figure out how to return back to tank / resevoir?

    Thank you Gary! Now I just have to figure out how to tap in with fittings. The line is a steel line with flare nuts on each side.

  7. #7
    Elite Member Chilly807's Avatar
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    Sep 2009
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    3,237
    Location
    Nova Scotia
    Tractor
    Kubota L3400DT

    Default Re: Cannot figure out how to return back to tank / resevoir?

    Quote Originally Posted by gsdavis1 View Post
    Thank you Gary! Now I just have to figure out how to tap in with fittings. The line is a steel line with flare nuts on each side.
    If you're going to install the return there, you need a Swagelok or similar compression type tee, with the "leg" of the tee having the matching fitting to your return line. Measure the distance the ends of the pipe will be apart when firmly bottomed in the tee, and cut that much out of the existing pipe.

    Once the pipe is cut, install the tee, hook up your return line and you're finished.

    Sean

  8. #8
    Platinum Member
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    Nov 2008
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    804
    Location
    Brampton, On\lot Powassan, ON Canada
    Tractor
    Kubota B4200\MF 135\Kubota B3200

    Default Re: Cannot figure out how to return back to tank / resevoir?

    Is there not a fill plug on the tractor? That is what I use for a return port on my kubota.
    Unimogdave

  9. #9
    Veteran Member Kernopelli's Avatar
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    Oct 2006
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    1,752
    Location
    Carterville, Illinois
    Tractor
    Mitsubishi MTE2000D, Dig It 258 Backhoe

    Default Re: Cannot figure out how to return back to tank / resevoir?

    I did the same as Dave. I have a Mitsubishi MTE 2000D and although it is a gear drive tractor, I faced the same predicament of how to return to tank when I put my FEL on. I simply ended up doing away with the dipstick/ fill screw in plug, which was located on top of the trans case between my legs. I used common pipe fittings available at any plumbing/hardware store. It worked out fine and threads were a perfect match. I was concerned that it would be in the way, look bad and be a hassle to not have the dipstick attached to the fill anymore but it really has not been an issue for me. When I check the fluid level I unscrew the hose and fitting then put the dipstick back in...inconvenient, yes but it is a 60 second deal and well worth it. In the end, ease and cost trumped the other methods. I shy away from pipe fittings for hydraulic use but since it is a return line, it doesn't see the same pressures as the supply side. I could not find a hydraulic fitting the correct size for the plug but I could have used Hyd fittings from the plug on up for the 90* but at that point of my install I was there to get it done and have not worried about it since.
    Attached Thumbnails Attached Thumbnails -hyd-return-001-jpg  
    Darryl

  10. #10
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    Default Re: Cannot figure out how to return back to tank / resevoir?

    Dave,

    Do you have a picture of your setup? Did you keep the use of the dipstick and filler cap?

    Thanks
    Greg

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