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  1. #1
    New Member
    Join Date
    Jul 2016
    Posts
    19
    Location
    France
    Tractor
    Someca 36

    Default 3040 JD hydraulic oil leak Help needed.

    I have a John Deere 3040 tractor that is losing a lot of oil from a cylindrical tank above the oil cooler and radiator. The previous owner simply put a hose into a drum to collect the oil and reused it.
    The cylindrical tank has a banjo connection on the top that the oil is coming from. It is connected to the suction side of the hydraulic pump driven from the front of the engine.
    I was wondering if the tank contains an expansion balloon that has burst. I simply have no idea what the problem is and what to do to cure it.
    Thank you for any replies.
    Humphrey
    ps I think it is the transmission header tank.
    Last edited by HumphreyUK; 07-18-2016 at 03:59 PM.

  2. #2
    Gold Member
    Join Date
    May 2014
    Posts
    499
    Location
    Paarl South Africa

    Default Re: 3040 JD hydraulic oil leak Help needed.

    expansion balloon .....no ! Oil comes from the main seal in the mainhydraulicpump to the top off the tank and then back to the gearshiftcover. That "bolt" ontop of the tank has a oneway checkvalve that prevents oil from entering that small tube . Check that valve !

  3. #3
    New Member
    Join Date
    Jul 2016
    Posts
    19
    Location
    France
    Tractor
    Someca 36

    Default Re: 3040 JD hydraulic oil leak Help needed.

    I will do that tomorrow and thank you for your help. We tried to undo it but thought it might shear off.

  4. #4
    New Member
    Join Date
    Jul 2016
    Posts
    19
    Location
    France
    Tractor
    Someca 36

    Default Re: 3040 JD hydraulic oil leak Help needed.

    Seems that the pipe that should have returned to the gearshift cover was broken off and never re-connected. It took 40 litres of oil to refill.

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