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  1. #1
    Member
    Join Date
    Feb 2011
    Posts
    26
    Location
    Archbald Pa
    Tractor
    JD 750

    Default Yanmar injection pump question

    I am looking for some help with trying to determine if i have a problem with the Yanmar injection pump on my JD 750 tractor.

    I was running the tractor and had shut it off to refuel it, it was only off for about 20-30 minutes

    Haven't been able to get it started since,,,,,,,,,,,,...

    I went thru the whole bleed the system thing several times , just to cover that problem , but the tractor was not run out of fuel , just shut off.

    There is no electrical shut off on this tractor just mechanical.

    When i took the inspection/access plate off of the side of the gearcase the pump is mounted to, it looks as though the rack on the pump is not moving at all
    when moving the throttle lever from shut off to full throttle position .

    I pulled the pump according to the instructions in the tech manual i have .

    The rack on the pump that moves with the throttle lever is very difficult to move back and forth .

    Problem is , i don't know if this is normal or not .

    WAs hoping someone on here might have had one of these pumps out and knows if it should move very freely or it takes some effort ( i kind of need to put both thumbs on it to press it )

    This is a link (if it works ) to a picture of the pump on my tractor .

    http://www.jhdiesel.com/Mvc-017s.jpg

    The picture on the right shows the rack that moves with the throttle linkage (a fork sits over the pin sticking out of rack and slides it open or close it .


    thanks

    Joe

  2. #2
    Elite Member
    Join Date
    Dec 2009
    Posts
    2,764
    Location
    gilmer tx
    Tractor
    yanmar 2002d

    Default Re: Yanmar injection pump question

    The only mention of rack moving in my ym220/226 manul (very similiar to your 750) says it should move smoothly. Interpret that as you will. Although I have no on hands experiance with these pumps I would bet a dollar to a donut the rack should move easily. If your rack would not move from full throttle to shutoff that would be another good indication it is to hard to move. Have you sprayed it good with a lubricant and tried freeing it up?

  3. #3
    Member
    Join Date
    Feb 2011
    Posts
    26
    Location
    Archbald Pa
    Tractor
    JD 750

    Default Re: Yanmar injection pump question

    I haven't sprayed it with anyting , yet .

    It kind of runs in an oil bath,or spray , since it is just off the cam shaft the runs the pump .

    I'm not sure if something couldn't have gotten into the "fuel side" of the pump and gummed it up , althought ,it was running fine 30 minutes prior to my problems

    Joe

  4. #4
    Member
    Join Date
    Sep 2012
    Posts
    33
    Location
    Dade City, FL
    Tractor
    Yanmar 3110D

    Default Re: Yanmar injection pump question

    Just went through a similay problem with my YM 3110D tractor. Shut it off and would not start. I installed a new injector pump, just like the one you have pictured and from what I discovered I can't believe that your problem is with the injector pump. Sometimes it appears to be hard to move, due to the linkage that attaches the throttle to the governor, if its anything like the Yanmar setup on the injector pump. If you think its stuck injecting a small amount of WD40 into the sliding mechanism wouldn't hurt to make sure its freed up. The small amount of WD 40 to the total quantity of diesel oil in your system would be insignificant but it might free up whatever you think has it stuck. I would look for some other reason for not starting, the injector pumps hardly ever go bad. How many hours are on your tractor?

  5. #5
    Member
    Join Date
    Feb 2011
    Posts
    26
    Location
    Archbald Pa
    Tractor
    JD 750

    Default Re: Yanmar injection pump question

    dirtdonkey

    I talked to a couple injection pump shops , both told me that the rack should slide very easily , i need to use two hands to hold the pump and push very hard with both thumbs to get it to move at all.

    I also found that the no 1 and no 3 plunger?? can be pressed in without too much effort , but the no 2 plunger doesn't want to move at all.

    I am going to try spraying it up with someting , to see if it loosens up at all , before buying another one .

    This is an old tractor , and there are 3200+ hrs on the clock , which doesn't work, so no telling how many hours are actually on it .

    I am guessing it has had an engine rebuild at some point, (block is a different color ) and pump was probably replaced , rebuilt , at some point.

    Guy i bought it from buys and sells old equipment , so no record on what was ever done to this tractor .

    I'm not a stranger to heavy equipment ,or full size tractors, (spend a lot of time baling hay on a dairy farm) but never had any of the small tractors.

    When i tried it out before buying , it seemed to run well enought for what i needed it for , it was a little rough , but i won't put very many hours on it in
    the course of a year .

    Only bought it for pushing a little snow now and then .

    I only bought it a month ago, and only ran it for about 2 hours, (thats the part that sucks the most, so far it will cost me $300 / hr........... to run it )

    What was wrong with the injection pump on your tractor ?

    Joe

  6. #6
    Member
    Join Date
    Sep 2012
    Posts
    33
    Location
    Dade City, FL
    Tractor
    Yanmar 3110D

    Default Re: Yanmar injection pump question

    With that many hours you may need a new pump. I thought it was my pump becuase I was only running on 2 cylinders instead of 3. When I disconnected the injector lines from the injectors and then cranked the tractor, while flooring it, I found I was getting some fuel out of #2 and barely any out of 1&3 so I assumed the pump was bad. Come to find out I had dropped an exhaust valve seat in #1 cylinder so the injector pump was probably still working but not as good as the new one I put in. Wasn't real hard installing the new pump. Good luck with getting everything back up and running.

  7. #7
    Member
    Join Date
    Feb 2011
    Posts
    26
    Location
    Archbald Pa
    Tractor
    JD 750

    Default Re: Yanmar injection pump question

    dirtdonkey
    Well , i decided to take a chance and try to loosen up the rack on my pump .
    Figured i did'nt have anyting to loose, i was going to buy a new pump , might as well try it .

    Took it into work with my and started soaking it with kroil and working the rack back and forth. When i started, i needed the help from a screwdriver handle to push the rack , after about 10 minutes of squirting with kroil and working it it started to loosen up , and now moves freely .
    I also took out the center delivery valve holder , that was piston that wasn't moving .

    I didn't really find anything inside , but after flushing it out and reassembling , i was able to move the piston .

    Going to try to find time to re-install the pump over the weekend and see if it works ........

    I still don't know how a pump could go from running , to siezed up , in the 20 minutes the tractor was shut off to refuel...........

    Also going to try to install a better fuel/water seperator / filter assembly .
    One of the injection shops i talked to wasn't very fond of the stock filter assembly on the tractor and thinks that might be what causes some of the injector / pump problems he sees.

    Will let you know how it works out .

    Either i saved myself $600 ,or i wasted a couple hours of my time......................


    Joe

  8. #8
    Platinum Member Neat 1500's Avatar
    Join Date
    Aug 2009
    Posts
    601
    Location
    Melbourne,Australia
    Tractor
    Yanmar YM1500 Red & YM14 MkII

    Default Re: Yanmar injection pump question

    Quote Originally Posted by JoeJChin View Post
    Either i saved myself $600 ,or i wasted a couple hours of my time......................Joe
    you tried, no one can have a go at you for that! thats more than most people attempt.
    Paul YM1500 & YM14 MkII

  9. #9
    Veteran Member
    Join Date
    Dec 2005
    Posts
    1,080
    Location
    Kentucky
    Tractor
    B2920

    Default Re: Yanmar injection pump question

    I've wasted a lot more than two hours on something less expensive that that plenty of times. Guess I'm like you and several others here, I'd rather tinker around with something and see if I can fix it rather than just throwing my hands up in the air and go buy new. If something can be fixed, I want to fix it, I've always got more time than money!

  10. #10
    Member
    Join Date
    Sep 2012
    Posts
    33
    Location
    Dade City, FL
    Tractor
    Yanmar 3110D

    Default Re: Yanmar injection pump question

    I try to fix everything prior to buying new, just like others mentioned you have nothing to lose. I also find that I learn a lot by taking things apart and then trying to get them to work. Have you bled your system before? I'd make sure you have a good filter system coming out of your tank that is also a water separator before starting. That way you know you're getting clean fuel with no water and the rest is just following the priming instructions and firing it up. Good luck and I hope your hard work pays off for you.

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