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  1. #1
    Bronze Member
    Join Date
    Dec 2010
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    60
    Tractor
    John DeereX748

    Default blew out 4020 hyd pump.

    Really ruined my day.
    Plent of oil
    No leaks
    Not too many hrs on filter less than 50

    Less than 500feet from home and it went out at the intersection. I had just stopped.

    Tore out the coupler and put a hole in the radiator.

    I always thought most pumps go out from poor maintenance but i didnt see this coming. No signs at all to directly link to the pump.

    This tractor has had hyd issues for a while though but i thought we had them taken care of.

    Our hyd pressure time with the clutch pushed in was excellent.

  2. #2
    Elite Member Tx Jim's Avatar
    Join Date
    Jan 2007
    Posts
    4,772
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: blew out 4020 hyd pump.

    Did pump come apart or drive coupler?

  3. #3
    Bronze Member
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    Dec 2010
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    60
    Tractor
    John DeereX748

    Default Re: blew out 4020 hyd pump.

    pump seized. Couple came apart.

    Yeah, it had oil in it. Fairly fresh and low hours. Changed the oil in the fall of '08 and probably didn't put 100 hours on it.

  4. #4
    Gold Member
    Join Date
    Nov 2009
    Posts
    264
    Location
    Freeland, MD
    Tractor
    706 IH, 1066 IH, and 301A JD

    Default Re: blew out 4020 hyd pump.

    Don't know if this was possible. We had a 2020 that used to eat hydraulic couplers. Found out the problem was that the entire front end was loose at the 6 bolts that attached the front cradle to the engine. Saw the movement in the radiator cap one day and solved the problem. Not sure, Maybe? These JD pumps are pretty much bullet proof, but how many hours on tractor? Possible maybe one of the pistons in the pump fell out and locked things up? Presure built tooooo high and locked up? There really is not a whole lot inside those pumps to go wrong. Pull it apart and see what you find, likely to be a simple solution, but expensive from the collateral damage.

  5. #5
    Elite Member Tx Jim's Avatar
    Join Date
    Jan 2007
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    4,772
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: blew out 4020 hyd pump.

    The hyd pump has 2 tapered roller brgs that one or both could have failed.

  6. #6
    Bronze Member
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    Dec 2010
    Posts
    60
    Tractor
    John DeereX748

    Default Re: blew out 4020 hyd pump.

    Could the valve in the differential lock be bad and pump oil faster than it's returned to the front pump and starve the pump?

  7. #7
    Super Member
    Join Date
    Feb 2008
    Posts
    9,392
    Location
    somewhere usa
    Tractor
    Deere 110tlb, 4520, x749, L130

    Default Re: blew out 4020 hyd pump.

    Quote Originally Posted by captplaid View Post
    Could the valve in the differential lock be bad and pump oil faster than it's returned to the front pump and starve the pump?

    Not likely, you mentioned in your first post that the hydraulic pressure time with the clutch pushed in was excellent.

    What kind of shape is the pump in, can you rebuild it? IIRC it has a Sundstrand 8 piston pump, I would tear it down and fix it and replace the coupler.

  8. #8
    Bronze Member
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    Dec 2010
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    60
    Tractor
    John DeereX748

    Default

    Quote Originally Posted by Tx Jim
    The hyd pump has 2 tapered roller brgs that one or both could have failed.
    My friend got bored or restless yrsterday while i was at work. He dropped the pump. Found a 3/8 long 1/8 diameter roller or needle valve.

    He said the bearings were intact.

    Once they got the pump out, it would turn. Perhaps that needle or roller floated up there and locked it up. Moving it around freed it up.

    If thats the case, it got through the rear filter.

  9. #9
    Elite Member Tx Jim's Avatar
    Join Date
    Jan 2007
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    4,772
    Location
    North Texas
    Tractor
    JD 4255/Kubota M7040 HDC

    Default Re: blew out 4020 hyd pump.

    Quote Originally Posted by captplaid View Post
    My friend got bored or restless yrsterday while i was at work. He dropped the pump. Found a 3/8 long 1/8 diameter roller or needle valve. If thats the case, it got through the rear filter.
    Can you post a photo of the piece found?

  10. #10
    Super Member
    Join Date
    Feb 2008
    Posts
    9,392
    Location
    somewhere usa
    Tractor
    Deere 110tlb, 4520, x749, L130

    Default Re: blew out 4020 hyd pump.

    There is also a filter screen about the size of a small shotgun shell on the pump's inlet line too.

    Where was the needle lodged? Might have been an internal part of the pump.

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