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  1. #1
    Join Date
    Feb 2011
    Archbald Pa
    JD 750

    Default r JD/ Yanmar injection pump question

    Anybody out there familiar with the following type injection pump ?

    link to picture

    It's a Yanmar pump off a JD 750 compact tractor .

    I was having trouble getting the tractor started , and ended up pulling the pump off of it .

    I don't think the pump is working properly .

    After all the normal bleeding purging etc trying to get the tractor started again ( 20 minutes after shutting it off )

    I pulled the access cover off the side of the gear case , and it doesn't look like the rack is moving in the pump when i move the throttle lever back and forth .

    If you look at the right hand picture , what i have seen called the rack , is the rod , with the pin sticking out of it .

    The pin is what sets into the yoke of the throttle arm .

    I pulled the pump out , and i can move the rod , but it moves very hard.
    Kind of takes two thumbs on it to make it move .

    The only reference i have seen , is that it "should move freely" .

    I was wondering if anyone here has had one out and can tell me how "freely " it is supposed to move , and if there is any reason

    it would get so hard to move while i was running it .



  2. #2
    Veteran Member
    Join Date
    Apr 2000
    North Central Arkansas
    John Deere 4520,

    Default Re: r JD/ Yanmar injection pump question

    Unable to give any reason for failure of pump But I would take it to a diesel injector shop to be checked.
    since already have it removed. mark any points to be remembered and let some one experanced give a suggestioin.

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