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Thread: JD 2040 Hydraulic Problem

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    JD 2040 Hydraulic Problem

    My 2040 hydraulics died. I cleaned the screen and checked the filter and replaced the seals in pto pump in the front of the engine. If I put oil in the reservoir the hydraulics work until it runs out. Does the transmission pump just go out all at once? If so do I have to split the tractor to get to it or can i get to it from the top? Is there a check valve that can go bad that I'm missing? Thanks for your help.

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    Do you have HI-LOW or Reverser trans? If NOT, there is a check valve in the oil line from the trans pump to the main pump. It is inside the oil line where the oil line leaves the tranmission (near your brake pedals, right hand side).

    There is also a filter in the inlet to the front pump.

    There is a filter bypass valve that might be stuck open. It directs oil back to the trans case if the filter plugs or the oil is cold.

    You could have an internal leak if you have HI-LOW , Reverser trans, or Independent PTO with broken steel line inside the trans case. Or the trans pump could have a broken steel line.

    You HAVE to split to r&r the trans pump.
    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader

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    JD Farmboy (01-26-2013)

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    Quote Originally Posted by Zebrafive View Post
    Do you have HI-LOW or Reverser trans? If NOT, there is a check valve in the oil line from the trans pump to the main pump. It is inside the oil line where the oil line leaves the tranmission (near your brake pedals, right hand side).

    There is also a filter in the inlet to the front pump.

    There is a filter bypass valve that might be stuck open. It directs oil back to the trans case if the filter plugs or the oil is cold.

    You could have an internal leak if you have HI-LOW , Reverser trans, or Independent PTO with broken steel line inside the trans case. Or the trans pump could have a broken steel line.

    You HAVE to split to r&r the trans pump.
    Thank you for your reply I did find a steel ball in the hydraulic line in the front pump could that be from that check valve it was bigger than the ones in the front pump and my tractor does have a hi-low

    thanks

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    Hey JJay MO, not trying to high-jack your thread but I'm having the exact same problem with my JD 1840. Just stopped working, but loader and 3ph moves slowly at high rpm. If I cycle the attachments up/down a few times it gets better and works like it should. Then when sitting idle for a minute it goes back to nothing. Maybe Zebrafive can confirm but I believe our trans/hyd systems are the same. I also have a syncro hi/lo shift, where exactly is this check valve? and has that fixed the problem?
    Thanks guys!
    (oh yeah, I also cleaned/changed filters and all new oil, same problem)

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    2040 front pump

    i've resealed the front pump 2 times in the last week checked the bypass and all lines and screen and filter tractor runs about 1 hour and pump starts to screech and blows out seal . anybody got any ideas?. maybe i can bypass the trans pump and remove the front pump i don'nt need the front loader

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    Zebrafive's Avatar
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    Quote Originally Posted by JD Farmboy View Post
    Hey JJay MO, not trying to high-jack your thread but I'm having the exact same problem with my JD 1840. Just stopped working, but loader and 3ph moves slowly at high rpm. If I cycle the attachments up/down a few times it gets better and works like it should. Then when sitting idle for a minute it goes back to nothing. Maybe Zebrafive can confirm but I believe our trans/hyd systems are the same. I also have a syncro hi/lo shift, where exactly is this check valve? and has that fixed the problem?
    Thanks guys!
    (oh yeah, I also cleaned/changed filters and all new oil, same problem)
    With HI-LO you will NOT have the check valve in the inlet line from the transmission
    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader

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    Zebrafive's Avatar
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    Quote Originally Posted by o. k. View Post
    i've resealed the front pump 2 times in the last week checked the bypass and all lines and screen and filter tractor runs about 1 hour and pump starts to screech and blows out seal . anybody got any ideas?. maybe i can bypass the trans pump and remove the front pump i don'nt need the front loader
    You need the trans pump for HI-LO tran or Reverser trans and if you have an Independent PTO (PTO engage lever between the two shift levers)

    You need the front pump for power steering, rockshaft (3pt hitch lift arms) SCVs.

    Have you checked system pressure before it starts to squeal/screech? Sounds like your main pump stroke control is not set right. Or problem with Pump crankcase outlet valve. The pump also has an internal filter. Have you replaced that?

    Which main pump do you have? 1.38 cubic inch or 2.40 cubic inch?
    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader

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    Zebrafive's Avatar
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    Quote Originally Posted by JJayMO View Post
    Thank you for your reply I did find a steel ball in the hydraulic line in the front pump could that be from that check valve it was bigger than the ones in the front pump and my tractor does have a hi-low

    thanks
    There is also a check ball on the top of the hydraulic reservoir, ball may be from there
    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader

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    Quote Originally Posted by Zebrafive View Post
    Do you have HI-LOW or Reverser trans? If NOT, there is a check valve in the oil line from the trans pump to the main pump. It is inside the oil line where the oil line leaves the tranmission (near your brake pedals, right hand side).

    There is also a filter in the inlet to the front pump.

    There is a filter bypass valve that might be stuck open. It directs oil back to the trans case if the filter plugs or the oil is cold.
    Okay, I finally had some time to work on my tractor. I realize now that I do NOT have Hi-Low trans, just thought I did with range I and II but my manual describes me having a collar shift. I looked and found the check valve, all is in tact and clear of debris. Where can I find the filter on inlet to front pump? Or are you refering to the long screen near the canister filter? That I checked and cleaned a few times now but system still not working. Also, how and where do I check on the filter bypass valve?
    Thanks again!
    ( I also have determined from JD Parts Schematics my pump is 2.4 cu in if that helps)
    P.S. I am slowly getting more familiar with my baby... until now all I've ever had to do was change some oil/filters and put a little air in the tires! Is the flow control valve (beside screen/canister) what I should looking "into" or inside? Is that the bypass valve in question? If so, can I just remove it to clean it up?
    Last edited by JD Farmboy; 01-26-2013 at 04:31 PM. Reason: more info

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    Zebrafive's Avatar
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    Filter is Key 17 part number R27173
    Attached Thumbnails Attached Thumbnails JD 2040 Hydraulic Problem-20302.40pump.jpg  
    John Deere 2030 w/245SL Loader
    John Deere 6415 w/640SL Loader

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