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  1. #1
    Member
    Join Date
    May 2006
    Posts
    41
    Location
    Barnhart, Missouri
    Tractor
    Ford-1100- New Holland 1720 - JD-345- JD-425- Cub Cadet- 1863

    Default JD 425 Oil pressure problem

    While puttimg my tractor away after mowing the oil light came on. I checked the oil andit was low. I added oil to the full mark but when started the light wont go out. Thinling it might be the sender unit I took it out and put in a gauge but it shows no pressure. It has no signs of locking up when run for the pressure test. Am I in for a major tear down for a oil pump repair or what do you suggest. this is a 96 year with the 20 hp Kaw. engine

  2. #2
    Silver Member
    Join Date
    Jun 2013
    Posts
    216
    Location
    N. GA
    Tractor
    LX188/445/755

    Default Re: JD 425 Oil pressure problem

    Quote Originally Posted by leftybob View Post
    Thinking it might be the sender unit I took it out and put in a gauge but it shows no pressure.
    Humm...
    I think I would drain the oil and see what I could see in the oil, and then change the oil filter just in case something is stopped up.
    Inspect the old oil carefully. Is it a JD filter and have you changed it regularly?

    I would not run it until you sort this out. Are you real sure there is zero oil pressure?

  3. #3
    Elite Member Gittyup's Avatar
    Join Date
    Oct 2007
    Posts
    2,832
    Location
    Mid Atlantic
    Tractor
    Kioti CK25 Shuttle Shift, loaded tires, JD X739

    Default Re: JD 425 Oil pressure problem

    If it is the oil pump, not that bad a tear down. I changed mine when I changed out a broken plastic cam shaft/gear. Also changed the water pump, governor gear, push rods, and o-rings/seals. About $500 in parts and 5 hours of labor, most of which is pulling the engine and putting it back in.

  4. #4
    Silver Member
    Join Date
    Jun 2013
    Posts
    216
    Location
    N. GA
    Tractor
    LX188/445/755

    Default Re: JD 425 Oil pressure problem

    Quote Originally Posted by Gittyup View Post
    If it is the oil pump, not that bad a tear down. I changed mine when I changed out a broken plastic cam shaft/gear. Also changed the water pump, governor gear, push rods, and o-rings/seals. About $500 in parts and 5 hours of labor, most of which is pulling the engine and putting it back in.
    5 hours... I suspect a shop would charge ~ $1400 for all this.
    I suppose you put a metal cam shaft in vs. the plastic. Mine already had the metal cam.
    -book_end_july_2011-006-jpg

  5. #5
    Elite Member Gittyup's Avatar
    Join Date
    Oct 2007
    Posts
    2,832
    Location
    Mid Atlantic
    Tractor
    Kioti CK25 Shuttle Shift, loaded tires, JD X739

    Default Re: JD 425 Oil pressure problem

    Yep, about right. They quoted $1300. Some have done it without removing the engine.

    So when they replaced the cam, did they change the oil pump at that time?

  6. #6
    Silver Member
    Join Date
    Jun 2013
    Posts
    216
    Location
    N. GA
    Tractor
    LX188/445/755

    Default Re: JD 425 Oil pressure problem

    Quote Originally Posted by Gittyup View Post
    Some have done it without removing the engine.
    So when they replaced the cam, did they change the oil pump at that time?
    I don't see how this could be done without engine removal; seems it would be harder if possible.
    I did not replace my cam; it was already steel and OK. I also did not replace the oil pump.
    I had a bad blow by issue and we was mainly replacing the rings.

    It's still spitting some oil back into the carb thru the crankcase vent. (not much)
    I do wish not I would have had it bored and larger pistons installed.
    It has just over 1100 hours.
    445 EFI...

  7. #7
    Elite Member Gittyup's Avatar
    Join Date
    Oct 2007
    Posts
    2,832
    Location
    Mid Atlantic
    Tractor
    Kioti CK25 Shuttle Shift, loaded tires, JD X739

    Default Re: JD 425 Oil pressure problem

    I think it can be done in the tractor by removing the muffler, battery, and front of the tractor. Then you can get to the front cover.

    It was much nicer to work on from my workbench though, and the extra work is motor mounts, drive shaft mainly. Worth it to work standing upright off a clean workbench.

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